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Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Summary of Property, Plant and Equipment

Property, plant and equipment as of December 31, 2019 and 2018 are comprised of the following (in thousands):


	December 31,
	2019			2018
Buildings and related structures	$	68,828		$	70,665
Machinery and equipment		327,677			323,325
Finance lease right-of-use assets		2,457			—
Others		42,681			44,724

		441,643			438,714
Less: accumulated depreciation		(273,959	)		(251,962	)
Land		14,890			15,419

Property, plant and equipment, net	$	182,574		$	202,171

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 151,657	$ 132,438
Accounts receivable, net	95,641	80,003
Unbilled accounts receivable, net	17,094	38,181
Inventories, net	73,267	71,611
Other receivables	10,254	3,702
Prepaid expenses	12,250	11,133
Hedge collateral (Note 9)	9,820	5,810
Other current assets (Notes 1 and 2)	9,382	9,867
Total current assets	379,365	352,745
Property, plant and equipment, net (Notes 5 and 7)	182,574	202,171
Operating lease right-of-use assets	11,482
Intangible assets, net	4,014	3,953
Long-term prepaid expenses	8,834	15,598
Other non-current assets	9,059	8,729
Total assets	595,328	583,196
Current liabilities
Accounts payable	60,879	55,631
Other accounts payable	10,293	15,168
Accrued expenses	55,076	46,250
Deferred revenue (Note 1)	1,422	6,477
Operating lease liabilities	2,036
Other current liabilities (Note 1)	4,127	9,133
Total current liabilities	133,833	132,659
Long-term borrowings, net	304,743	303,577
Non-current operating lease liabilities	9,446
Accrued severance benefits, net	146,728	146,031
Other non-current liabilities (Note 6)	15,559	18,239
Total liabilities	610,309	600,506
Commitments and contingencies (Note 19)
Stockholders' equity
Common stock, $0.01 par value, 150,000,000 shares authorized, 43,851,991 shares issued and 34,800,312 outstanding at December 31, 2019 and 43,054,458 shares issued and 34,441,232 outstanding at December 31, 2018	439	431
Additional paid-in capital	152,404	142,600
Accumulated deficit	(58,131)	(36,305)
Treasury stock, 9,051,679 shares at December 31, 2019 and 8,613,226 shares at December 31, 2018, respectively	(107,033)	(103,926)
Accumulated other comprehensive loss	(2,660)	(20,110)
Total stockholders' deficit	(14,981)	(17,310)
Total liabilities and stockholders' equity	$ 595,328	$ 583,196

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (21,826)	$ (3,900)	$ 84,936
Other comprehensive income (loss)
Foreign currency translation adjustments	15,856	18,352	(52,873)
Derivative adjustments
Fair valuation of derivatives	(2,894)	(1,589)	7,736
Reclassification adjustment for loss (gain) on derivatives included in net income (loss)	4,488	(3,759)	(2,001)
Total other comprehensive income (loss)	17,450	13,004	(47,138)
Total comprehensive income (loss)	$ (4,376)	$ 9,104	$ 37,798

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Fair Value Measurements - Additional Information (Detail) - USD ($)			12 Months Ended
	Jan. 17, 2017	Jul. 18, 2013	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Feb. 28, 2019	Jan. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt issuance costs paid					$ 5,902,000
Exchangeable Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Due date	Mar. 01, 2021
6.625% Senior Notes Due 2021 [Member] \| Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate		6.625%	6.625%	6.625%
Due date		Jul. 15, 2021	Jul. 15, 2021	Jul. 15, 2021
Aggregate principal amount		$ 225,000,000
Debt issuance costs paid		5,039,000
Original debt issue discount		$ 1,125,000
Principal Repurchase Amount Of Exchangeable Notes				$ 500,000			$ 250,000
5.0% Exchangeable Senior Notes due March 2021 [Member] \| Exchangeable Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate	5.00%		5.00%	5.00%	5.00%
Due date	Mar. 01, 2021		Mar. 01, 2021	Mar. 01, 2021
Aggregate principal amount	$ 86,250,000
Debt issuance costs paid	$ 5,902,000
Principal Repurchase Amount Of Exchangeable Notes				$ 1,590,000		$ 920,000
Other Asset Class [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets fair value on non-recurring basis			$ 0
Liabilities fair value on non-recurring basis			$ 0

Leases - Aggregate future lease payment (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating Leases, 2020	$ 2,843	$ 4,319
Operating Leases, 2021	1,355	3,569
Operating Leases, 2022	1,096	1,570
Operating Leases, 2023	1,088	1,319
Operating Leases, 2024	1,088	1,309
Operating Leases, Thereafter	10,618	13,978
Operating Leases, Total future lease payments	18,088	$ 26,064
Less: Present value adjustment	(6,606)
Present value of future payments	11,482
Finance Leases [Abstract]
Finance Leases, 2020	413
Finance Leases, 2021	413
Finance Leases, 2022	413
Finance Leases, 2023	413
Finance Leases, 2024	150
Finance Leases, Thereafter	1,463
Finance Leases, Total future lease payments	3,265
Less: Present value adjustment	(1,042)
Present value of future payments	$ 2,223

Business, Basis of Presentation and Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Business, Basis of Presentation and Summary of Significant Accounting Policies

1. Business, Basis of Presentation and Summary of Significant Accounting Policies

Business

MagnaChip Semiconductor Corporation (together with its subsidiaries, the “Company”) is a designer and manufacturer of analog and mixed-signal semiconductor platform solutions for communications, Internet of Things (“IoT”) applications, consumer, industrial and automotive applications. The Company provides technology platforms for analog, mixed signal, power, high voltage,

non-volatile

memory and Radio Frequency (“RF”) applications. The Company’s business is comprised of

two

operating segments: Foundry Services Group and Standard Products Group. The Company’s Foundry Services Group provides specialty analog and mixed-signal foundry services mainly for fabless and Integrated Device Manufacturer (“IDM”) semiconductor companies that primarily serve communications, IoT, consumer, industrial and automotive applications. The Company’s Standard Products Group is comprised of

two

business lines: Display Solutions and Power Solutions. The Company’s Display Solutions products provide panel display solutions to major suppliers of large and small rigid and flexible panel displays, and mobile, automotive applications and home appliances. The Company’s Power Solutions products include discrete and integrated circuit solutions for power management in communications, consumer and industrial applications.

Basis of Presentation

The consolidated financial statements are presented in accordance with accounting principles generally accepted in the United States of America (“US GAAP”).

Significant accounting policies followed by the Company in the preparation of the accompanying consolidated financial statements are summarized below.

Principles of Consolidation

The consolidated financial statements include the accounts of the Company including its wholly-owned subsidiaries. All intercompany transactions and balances are eliminated in consolidation.

Use of Estimates

The preparation of financial statements in accordance with US GAAP requires management to make estimates and assumptions about future events. These estimates and the underlying assumptions affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities, and reported amounts of revenue and expenses. Such estimates include the valuation of accounts receivable, unbilled accounts receivable, inventories, stock based compensation, property plant and equipment, intangible assets, leases, other long-lived assets, long-term employee benefits, contingencies liabilities, estimated future cash flows and other assumptions used in long-lived asset impairment tests and calculation of income taxes and deferred tax valuation allowances, and assumptions used in the calculation of sales incentives, among others. Although these estimates and assumptions are based on management’s best knowledge of current events and actions that the Company may undertake in the future, actual results may be significantly different from the estimates.

Foreign Currency Translation

The Company has assessed in accordance with Accounting Standards Codification (ASC) 830, “Foreign Currency Matters” (“ASC 830”), the functional currency of each of its subsidiaries in Luxembourg and the Netherlands and has designated the US dollar to be their respective functional currencies. The Korean Won is the functional currency for the Company’s Korean subsidiary, which is the primary operating subsidiary of the Company. The Company and its other subsidiaries are utilizing their local currencies as their functional currencies. The financial statements of the subsidiaries in functional currencies other than the US dollar are translated into the US dollar in accordance with ASC 830. All the assets and liabilities are translated to the US dollar at the

end-of-period

exchange rates. Capital accounts are determined to be of a permanent nature and are therefore translated using historical exchange rates. Revenues and expenses are translated using average exchange rates for the respective periods. Foreign currency translation adjustments arising from differences in exchange rates from period to period are included in the foreign currency translation adjustment account in accumulated other comprehensive loss of stockholders’ equity. Foreign currency translation gains or losses on transactions by the Company or its subsidiaries in a currency other than its or its subsidiaries’ functional currency are included in foreign currency gain (loss), net in its statements of operations.

Cash and Cash Equivalents

Cash equivalents consist of highly liquid investments with an original maturity date of

three months or less

when purchased.

Accounts Receivable Reserves

An allowance for doubtful accounts is provided based on the aggregate estimated uncollectability of the Company’s accounts receivable. The Company also records an estimate for sales returns, included within accounts receivable, net, based on the historical experience of the amount of goods that will be returned and refunded or replaced. In addition, the Company also includes in accounts receivable, net, an allowance for volume discounts offered to certain customers and distributors for meeting agreed upon levels of sales volume.

Sales of Accounts Receivable

The Company accounts for transfers of financial assets under ASC 860, “Transfers and Servicing,” as either sales or financings. Transfers of financial assets that result in sales accounting are those in which (1) the transfer legally isolates the transferred assets from the transferor, (2) the transferee has the right to pledge or exchange the transferred assets and no condition both constrains the transferee’s right to pledge or exchange the assets and provides more than a trivial benefit to the transferor, and (3) the transferor does not maintain effective control over the transferred assets. If the transfer does not meet these criteria, the transfer is accounted for as a financing. Financial assets that are treated as sales are removed from the Company’s accounts with any realized gain or loss reflected in earning during the period of sale.

Inventories

Inventories are stated at the lower of cost or net realizable value, using the first in, first out method (“FIFO”). If net realizable value is less than cost at the balance sheet date, the carrying amount is reduced to the realizable value, and the difference is recognized as a loss on valuation of inventories within cost of sales. Inventory reserves are established when conditions indicate that the net realizable value is less than costs due to physical deterioration, obsolescence, changes in price levels, or other causes based on individual facts and circumstances. The Company evaluates the sufficiency of inventory reserves and takes into consideration historical usage, expected demand, anticipated sales price, new product development schedules, the effect new products might have on the sale of existing products, product age and other factors. Reserves are also established for excess inventory based on the Company’s current inventory levels and projected demand and its ability to sell those specific products. Situations that could cause these inventory reserves include a decline in business and economic conditions, decline in consumer confidence caused by changes in market conditions, sudden and significant decline in demand for our products, inventory obsolescence because of rapidly changing technology and consumer requirements, or failure to estimate end customer demand properly. A reduction of these inventory reserves may be recorded if previously reserved items are subsequently sold as a result of unexpected changes to certain aforementioned situations.

In addition, as prescribed in ASC 330, “Inventory,” once a reserve is established for a particular item based on the Company’s assessment as described above, it is maintained until the related item is sold or scrapped as a new cost basis has been established that cannot subsequently be marked up. In addition, the cost of inventories is determined based on the normal capacity of each fabrication facility. In case the capacity utilization is lower than a certain level that management believes to be normal, the fixed overhead costs per production unit which exceeds those under normal capacity are charged to cost of sales rather than capitalized as inventories.

Advances to Suppliers

The Company, from time to time, may make advances in form of prepayments or deposits to suppliers to procure materials to meet its planned production. The Company recorded advances of $

6,593

thousand and $

8,132

thousand as other current assets as of December 31, 2019 and 2018, respectively.

Property, Plant and Equipment

Property, plant and equipment are stated at cost, less accumulated depreciation. Depreciation is computed using the straight-line method over the estimated useful lives of the assets as set forth below.


Buildings			30 - 40 years
Building related structures			10 - 20 years
Machinery and equipment			10 - 12 years
Others			3 - 10 years

Routine maintenance and repairs are charged to expense as incurred. Expenditures that enhance the value or significantly extend the useful lives of the related assets are capitalized.

Impairment of Long-Lived Assets

The Company reviews property, plant and equipment and other long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable in accordance with ASC 360, “Property, Plant and Equipment.” Recoverability is measured by comparing its carrying amount with the future net undiscounted cash flows the assets are expected to generate. If such assets are considered to be impaired, the impairment is measured as the difference between the carrying amount of the assets and the fair value of assets using the present value of the future net cash flows generated by the respective long-lived assets.

Restructuring Charges

The Company recognizes restructuring charges in accordance with ASC 420, “Exit or Disposal Cost Obligations.” Certain costs and expenses related to exit or disposal activities are recorded as restructuring charges when liabilities for those costs and expenses are incurred.

Leases

The Company determines if an arrangement is a lease at inception of a contract considering whether the arrangement conveys the right to control the use of an identified asset over the period of use. Control of an underlying asset is conveyed if the Company has the right to direct the use of, and to obtain substantially all of the economic benefits from the use of, the identified asset. The Company accounts for lease transactions as either an operating or a finance lease, depending on the terms of the underlying lease arrangement. Assets related to operating leases are recorded on the balance sheet as operating lease

right-of-use

assets; the related liabilities are recorded as operating lease liabilities for the current portion and

non-current

operating lease liabilities for the

non-current

portion. Finance lease

right-of-use

assets are included in property and equipment, net and the related lease liabilities are included in other current liabilities and other

non-current

liabilities on the consolidated balance sheets.

Right-of-use

assets represent the Company’s right to use an underlying asset during the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease.

Right-of-use

assets and liabilities are recognized based on the present value of the future minimum lease payments over the lease term. As most of the Company’s leases do not provide a readily determinable implicit rate, the Company estimates its incremental borrowing rates in determining the present value of future payments based on the lease term of each lease and market information available at commencement date. Finance lease

right-of-use

assets are amortized on a straight-line basis over the respective lease term with the interest expense on the lease liability recorded using the interest method. The amortization and interest expense are recorded separately in the consolidated statements of operations. Amortization of operating lease

right-of-use

assets and interest expense on operating lease liabilities are recognized on a straight-line basis over the respective lease term.

An extension or contraction of a lease term is considered if the related option to extend or early terminate the lease is reasonably certain to be exercised by the Company. Operating lease

right-of-use

assets may also include any advance lease payments made and exclude lease incentives and initial direct costs incurred. The Company has lease agreements with lease and

non-lease

components, which are generally accounted for separately. For certain equipment leases, lease and

non-lease

components are accounted for as a single lease component.

Variable lease payment amounts that cannot be determined at the commencement of the lease such as increases in lease payments based on changes in index rates are not included in the

right-of-use

assets or liabilities. These variable lease payments are expensed as incurred.

The Company does not recognize operating lease

right-of-use

assets and operating lease liabilities that arise from short-term leases but rather recognizes fixed lease payments in the statements of operations on a straight-line basis and variable payments in the period in which the related obligations incur.

Intangible Assets

Intangible assets other than intellectual property include technology and customer relationships that are amortized on a straight-line basis over periods ranging from

one

five

years. Intellectual property assets acquired represent rights under patents, trademarks and property use rights and are amortized over their respective periods of benefit, ranging up to

ten

years, on a straight-line basis.

Fair Value Disclosures of Financial Instruments

The Company follows ASC 820, “Fair Value Measurements and Disclosures” (“ASC 820”) for measurement and disclosures about fair value of its financial instruments. ASC 820 establishes a framework for measuring fair value in US GAAP, and expands disclosures about fair value measurements. To increase consistency and comparability in fair value measurements and related disclosures, ASC 820 establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels. The fair value hierarchy gives the highest priority to quoted prices (unadjusted) in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The three levels of fair value hierarchy defined by ASC 820 are:

Level 1—Inputs are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date.

Level 2—Inputs (other than quoted market prices included in Level 1) are either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument’s anticipated life.

Level 3—Inputs reflect management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. Consideration is given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model. Valuation of instruments includes unobservable inputs to the valuation methodology that are significant to the measurement of fair value of assets or liabilities.

As defined by ASC 820, the fair value of a financial instrument is the amount at which the instrument could be exchanged in a current transaction between willing parties, other than in a forced or liquidation sale, which was further clarified as the price that would be received to sell an asset or paid to transfer a liability (“an exit price”) in an orderly transaction between market participants at the measurement date. The carrying amounts of the Company’s financial assets and liabilities, such as cash equivalents, accounts receivable, other receivables, accounts payable and other accounts payable approximate their fair values because of the short maturity of these instruments.

Accrued Severance Benefits

The majority of accrued severance benefits

are

for employees in the Company’s Korean subsidiary, MagnaChip Semiconductor Ltd. Pursuant to the Employee Retirement Benefit Security Act of Korea, eligible employees and executive officers with one or more years of service are entitled to severance benefits upon the termination of their employment based on their length of service and rate of pay. As of December 31, 2019, 98% of all employees of the Company were eligible for severance benefits.

Accrued severance benefits are funded through a group severance insurance plan. The amounts funded under this insurance plan are classified as a reduction of the accrued severance benefits. Subsequent accruals are to be funded at the discretion of the Company.

In accordance with the National Pension Act of the Republic of Korea, a certain portion of accrued severance benefits is deposited with the National Pension Fund and deducted from the accrued severance benefits. The contributed amount is paid to employees from the National Pension Fund upon their retirement.

Beginning in July 2018, the Company began contributing a percentage of severance benefits, which may be adjusted from time to time, accrued for eligible employees for their services beginning January 1, 2018, to certain severance insurance deposit accounts. These accounts consist of time deposits and other guaranteed principal and interest accounts, and are maintained at insurance companies, banks or security companies for the benefit of the Company’s employees.

Revenue Recognition

The Company recognizes revenue when it satisfies the performance obligation of transferring control over a product or service to a customer. Revenue is measured based on the consideration specified in a contract with a customer, which consideration is paid in exchange for a product or service.

The Foundry Services Group of the Company manufactures products, which the Company refers to as foundry products, based on customers’ specific product designs. The Company recognizes revenue over time for foundry products that do not have an alternative use when the Company has an enforceable right to payment. Revenue recognized over time is in proportion of wafer manufacturing costs incurred relative to total estimated costs for completion. However, in certain circumstances, pursuant to a customer contract or an individual purchase order, the Company may not have an enforceable right to payment for services performed at a given time. In this situation, the Company recognizes revenue at the time when a customer obtains control of the product, which is generally upon product shipment, delivery at the customer’s location or upon customer acceptance, depending on the terms of the arrangement.

The Standards Products Group of the Company sells products manufactured based on the Company’s design. The Standard Products Group’s products are either standardized with an alternative use or the Company does not have an enforceable right to payment for the related manufacturing services completed to date. Therefore, revenue for the Standards Products Group’s products is recognized when a customer obtains control of the product, which is generally upon product shipment, delivery at the customer’s location or upon customer acceptance, depending on the terms of the arrangement.

A portion of the Company’s sales are made through distributors for which the Company applies the same revenue recognition guidance described above. The Company defers the recognition of revenue when it receives consideration from the customers prior to the fulfillment of performance obligations. These amounts are classified as deferred revenue on the consolidated balance sheets. Of the recorded deferred revenue of $6,477 thousand as of December 31, 2018, $1,885 thousand w

recognized as revenue during the year ended December 31, 2019 and $

4,428

thousand was refunded to a certain customer as the relevant advance payment agreement was terminated. Of the recorded deferred revenue of $8,335 thousand as of January 1, 2018, $3,496 thousand was recognized as revenue during the year ended December 31, 2018, and $4,671 thousand was reclassified to other current liabilities as the relevant advance payment agreement with a certain customer was terminated.

In accordance with revenue recognition guidance, any tax assessed by a governmental authority that is both imposed on and concurrent with a specific revenue-producing transaction, and that is collected by the Company from a customer, is excluded from revenue and related revenue is presented in the statements of operations on a net basis.

The Company provides warranties under which customers can return defective products. The Company also provides allowances for additional products that may have to be provided free of charge to compensate customers for not meeting previously agreed upon yield criteria, which the Company refers to as the low yield compensation reserve. The Company estimates the costs related to warranty claims, repair or replacements and low yield compensation reserves, and records them as components of cost of sales.

In addition, the Company offers sales returns (other than those that relate to defective products under warranty), cash discounts for early payments, sales incentives including discounts and volume rebates, and certain allowances to the Company’s customers, including the Company’s distributors. The Company records reserves for those returns, discounts, incentives and allowances as a deduction from sales, based on historical experience and other quantitative and qualitative factors.

Substantially all of the Company’s contracts are

one

year or less in duration. The standard payment terms with customers are generally

thirty

sixty

days from the time of shipment, product delivery to the customer’s location or customer acceptance, depending on the terms of the related arrangement.

Unbilled accounts receivable represents the Company’s contractual right to consideration for manufacturing work performed on a customer contract or an individual purchase order

that

has not been invoiced to the customer. As of December 31, 2019 and 2018, the Company recorded unbilled accounts receivable of $17,094, net of an allowance of $627 thousand, and $

38,181

thousand, net of an allowance of nil, respectively. Of the recorded unbilled accounts receivable of $38,181 thousand as of December 31, 2018, $34,910 thousand were billed to customers upon shipment, upon product delivery or upon customer acceptance, depending on the terms of the related arrangement, during the year ended December 31, 2019.

All amounts billed to a customer related to shipping and handling are classified as sales while all costs incurred by the Company for shipping and handling are classified as selling, general and administrative expenses. The amounts charged to selling, general and administrative expenses were $

1,769

thousand, $

1,861

thousand, and $

1,652

thousand for the years ended December 31, 2019, 2018 and 2017, respectively.

Derivative Financial Instruments

The Company applies the provisions of ASC 815, “Derivatives and Hedging” (“ASC 815”). This Statement requires the recognition of all derivative instruments as either assets or liabilities measured at fair value.

Under the provisions of ASC 815, the Company may designate a derivative instrument as hedging the exposure to variability in expected future cash flows that are attributable to a particular risk (a “cash flow hedge”) or hedging the exposure to changes in the fair value of an asset or a liability (a “fair value hedge”). Special accounting for qualifying hedges allows the effective portion of a derivative instrument’s gains and losses to offset related results on the hedged item in the consolidated statements of operations and requires that a company formally document, designate and assess the effectiveness of the transactions that receive hedge accounting treatment. Both at the inception of a hedge and on an ongoing basis, a hedge must be expected to be highly effective in achieving offsetting changes in cash flows or fair value attributable to the underlying risk being hedged. If the Company determines that a derivative instrument is no longer highly effective as a hedge, it discontinues hedge accounting prospectively and future changes in the fair value of the derivative are recognized in current earnings. The Company assesses hedge effectiveness at the end of each quarter.

In accordance with ASC 815, changes in the fair value of derivative instruments that are cash flow hedges are recognized in accumulated other comprehensive income (loss) and reclassified into earnings in the period in which the hedged item affects earnings. Derivative instruments that do not qualify, or cease to qualify, as hedges must be adjusted to fair value and the adjustments are recorded through net income (loss).

The cash flows from derivative instruments receiving hedge accounting treatment are classified in the same categories as the hedged items in the consolidated statements of cash flows.

Advertising

The Company expenses advertising costs as incurred. Advertising expense was approximately $134 thousand, $121 thousand and $95 thousand for the years ended December 31, 2019, 2018 and 2017, respectively.

Product Warranties

The Company records, in other current liabilities, warranty liabilities for the estimated costs that may be incurred under its basic limited warranty. The standard limited warranty period is one to two years for the majority of products. This warranty covers defective products, and related liabilities are accrued when product revenues are recognized. Factors that affect the Company’s warranty liabilities include historical and anticipated rates of warranty claims and repair or replacement costs per claim to satisfy the Company’s warranty obligation. The Company also records, in other current liabilities, low yield compensation reserves for its estimated costs for products that may have to be provided free of charge to compensate customers for not meeting previously agreed upon yield criteria. Factors that affect the Company’s low yield compensation reserves include historical and anticipated rates of claims for not meeting previously agreed upon yield criteria. The Company periodically assesses the adequacy of those recorded warranty liabilities and low yield compensation reserves, and adjusts its estimates when necessary.

Research and Development

Research and development expenses are expensed as incurred and include wafers, masks, employee expenses, contractor fees, building costs, utilities and administrative expenses.

Licensed Patents and Technologies

The Company has entered into a number of royalty agreements to license patents and technology used in the design of its products. The Company carries two types of royalties:

lump-sum

and running basis.

Lump-sum

royalties, which require initial payments, usually paid in installments, represent a

non-refundable

commitment, such that the total present value of these payments is recorded as a prepaid expense and a liability upon execution of the agreements and the costs are amortized over the contract period using the straight-line method and charged to research and development expenses in the consolidated statements of operations.

Running royalties are paid based on the revenue of related products sold by the Company.

Stock-Based Compensation

The Company follows the provisions of ASC 718, “Compensation-Stock Compensation” (“ASC 718”). Under ASC 718, stock-based compensation cost is measured at the grant date, based on the fair value of the award, and is recognized as expense, net of the estimated forfeiture rate, over the requisite service period. As permitted under ASC 718, the Company elected to recognize compensation expense for all options with graded vesting based on the graded attribution method.

The Company uses the Black-Scholes option-pricing model to measure the grant-date-fair-value of options. The Black-Scholes model requires certain assumptions to determine an option’s fair value, including expected term, risk free interest rate and expected volatility. The expected term of each option grant was based on employees’ expected exercises and post-vesting employment termination behavior and the risk free interest rate was based on the US Treasury yield curve for the period corresponding with the expected term at the time of grant. No dividends were assumed for this calculation of option value.

Earnings Per Share

In accordance with ASC 260, “Earnings Per Share”, the Company computes basic earnings per share by dividing net income (loss) available to common stockholders by the weighted average number of common shares outstanding during the period. Diluted earnings per share reflect the dilution of potential common stock outstanding during the period including stock options and restricted stock units, using the treasury stock method (by using the average stock price for the period to determine the number of shares assumed to be purchased from the exercise of stock options and restricted stock units), and convertibles, using the

if-converted

method. In determining the hypothetical shares repurchased, the Company uses the average share price for the period. In the case that earnings are negative, any potential common stock equivalents would have the effect of being anti-dilutive in the computation of net loss per share.

Income Taxes

The Company accounts for income taxes in accordance with ASC 740, “Income Taxes” (“ASC 740”). ASC 740 requires recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in a company’s financial statements or tax returns. Under this method, deferred tax assets and liabilities are determined based upon the difference between the financial statement carrying amounts and the tax bases of assets and liabilities using enacted tax rates in effect in the years in which the differences are expected to reverse. Valuation allowances are established when it is necessary to reduce deferred tax assets to the amount expected to be realized. Income tax expense is the tax payable for the period and the change during the period in deferred tax assets and liabilities.

The Company recognizes and measures uncertain tax positions taken or expected to be taken in a tax return utilizing a

two-step

process. In the first step, recognition, the Company determines whether it is

more-likely-than-not

that a tax position will be sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits of the position. The second step addresses measurement of a tax position that meets the

more-likely-than-not

criteria. The tax position is measured at the largest amount of benefit that has a likelihood of greater than 50 percent of being realized upon ultimate settlement.

Concentration of Credit Risk

The Company performs periodic credit evaluations of its customers’ financial condition and generally does not require collateral for customers on accounts receivable. The Company maintains reserves for potential credit losses, which are periodically reviewed.

Recent Accounting Pronouncements

Not Yet Adopted

In December 2019, the FASB issued Accounting Standards Update No. ASU

2019-12,

“Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes” (“ASU

2019-12”).

ASU

2019-12

removes certain exceptions to the general principles in Topic 740 and improves consistent application of and simplifies GAAP for other areas of Topic 740 by clarifying and amending existing guidance. ASU 2019-12 is effective

for

fiscal years beginning after December 15, 2020, and interim periods within those fiscal years. The Company does not expect the adoption of ASU 2019-12 to have a material effect on the Company’s consolidated financial statements.

In June 2016, the FASB issued Accounting Standards Update

No. 2016-13,

“Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” (“ASU

2016-13”).

ASU

2016-13

amends the impairment model by requiring entities to use a forward-looking approach based on expected losses to estimate credit losses on certain types of financial instruments, including trade receivables. In April 2019, the FASB issued Accounting Standards Update

No. 2019-04,

“Codification Improvements to Topic 326, Financial Instruments—Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments” (“ASU

2019-04”)

and

n November 2019, the FASB issued Accounting Standards Update No. 2019-11, “Codification Improvements to Topic 326, Financial Instruments—Credit Losses” (“ASU 2019-11”) to clarify and address certain items related to the amendments in ASU

2016-13.

ASU

2016-13,

ASU

2019-04

and ASU

2019-11

are effective for fiscal years beginning after December 15, 2019, with early adoption permitted. The Company does not expect the adoption of ASU

2016-13,

ASU

2019-04

and

2019-11

to have a material effect on the Company’s consolidated financial statements.

In August 2018, the FASB issued Accounting Standards Update

No. 2018-13

“Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement” (“ASU

2018-13”).

ASU

2018-13

amends existing fair value measurement disclosure requirements by adding, changing, or removing certain disclosures. ASU

2018-13

is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted for any eliminated or modified disclosures. The Company does not expect that the adoption will have an impact on the Company’s consolidated financial statements.

Recently Adopted Accounting Pronouncements

In February 2018, the FASB issued Accounting Standards Update

No. 2018-02,

Income Statement – Reporting Comprehensive Income (Topic 220) Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, which allows for a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax

Reform

. The Company adopted ASU

2018-02

in the first quarter of 2019, and the adoption did not impact the Company’s consolidated financial statements and related disclosures.

In August 2017, the FASB issued Accounting Standards Update

No. 2017-12,

“Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities” (“ASU

2017-12”).

ASU

2017-12

provides new guidance about income statement classification and eliminates the requirement to separately measure and report hedge ineffectiveness. The entire change in fair value for qualifying hedge instruments included in the effectiveness will be recorded in other comprehensive income (“OCI”) and amounts deferred in OCI will be reclassified to earnings in the same income statement line item in which the earnings effect of the hedged item is reported. The Company adopted ASU

2017-12

in the first quarter of 2019, and the adoption of ASU

2017-12

did not have a material impact to the Company’s consolidated financial statements.

In July 2017, the FASB issued Accounting Standards Update

No. 2017-11,

“Earnings Per Share (Topic 260): Distinguishing Liabilities from Equity (Topic 480): Derivatives and Hedging (Topic 815)” (“ASU

2017-11”),

which addresses the complexity of accounting for certain financial instruments with down round features. Down round features are features of certain equity-linked instruments (or embedded features) that result in the strike price being reduced on the basis of the pricing of future equity offerings. Current accounting guidance creates cost and complexity for entities that issue financial instruments (such as warrants and convertible instruments) with down round features that require fair value measurement of the entire instrument or conversion option. The Company adopted ASU

2017-11

in the first quarter of 2019, and the adoption did not impact the Company’s consolidated financial statements.

In February 2016, the FASB issued Accounting Standards Update

No. 2016-02,

“Leases (Topic 842)” (“ASU

2016-02”)

in order to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet for those leases classified as operating leases under US GAAP. ASU

2016-02

requires that a lessee recognize a liability to make lease payments and a

right-of-use

asset representing its right to use the underlying asset for the lease term on the balance sheet. The FASB issued Accounting Standards Update No

2018-01,

“Leases (Topic 842) Land Easement Practical Expedient for Transition to Topic 842” (“ASU

2018-01”).

ASU

2018-01

permits an entity to elect an optional transition practical expedient not to evaluate land easements that exist or expired before the entity’s adoption of ASU

2016-02

and that were not accounted for as leases under previous lease guidance. In July 2018, the FASB issued Accounting Standards Update No

2018-10,

“Codification Improvements to Topic 842 Leases” (“ASU

2018-10”).

ASU

2018-10

provides narrow amendments to clarify how to apply certain aspects of the new lease standard. In July 2018, the FASB also issued Accounting Standards Update No

2018-11,

“Leases (Topic 842) Targeted Improvements” (“ASU

2018-11”).

ASU

2018-11

allows an entity to recognize a cumulative-effect adjustment to the opening balance of retained earnings upon adoption of ASU

2016-02

(the “modified retrospective transition method”). In December 2018, the FASB issued Accounting Standards Update No

2018-20,

“Leases (Topic 842) Narrow Scope Improvements for Lessors” (“ASU

2018-20”).

ASU

2018-20

provides certain amendments that affect narrow aspects of the guidance issued in ASU

2016-02.

In March 2019, the FASB issued Accounting Standards Update No

2019-01

“Codification Improvements” (“ASU

2019-01”).

The effective date and transition requirements for ASU

2016-02,

ASU

2018-01,

ASU

2018-10,

ASU

2018-11,

ASU

2018-20

and ASU

2019-01

are the same.

The Company adopted the new lease standard as of January 1, 2019, using the modified retrospective transition method, which requires a cumulative effect adjustment, if any, to the Company’s beginning equity to be recognized on the date of adoption. There was no cumulative effect adjustment recorded on January 1, 2019. Accordingly, all periods prior to January 1, 2019, were presented in accordance with the previous FASB Accounting Standards Codification (“ASC”) Topic 840, Leases, and no retrospective adjustments were made to the comparative periods presented. The impact from the adoption was the balance sheet recognition of

right-of-use

assets and lease liabilities for operating and finance leases as a lessee, which resulted in an increase of $16,387 thousand in the total assets and liabilities of the Company’s consolidated balance sheets as of January 1, 2019.

The Company used hindsight for determining a remaining lease term and assessing the likelihood of whether a renewal option is reasonably certain to be exercised by the Company.

In addition, the adoption did not materially impact the Company’s consolidated statements of operations or cash flows for the year ended December 31, 2019

. For further information regarding these impacts, see Note 7, “Leases.”

In May 2014, the FASB issued ASU

2014-09.

ASU

2014-09

supersedes the revenue recognition requirements in “Revenue Recognition (Topic 605)”, and requires entities to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. ASU

2014-09

is effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. The new guidance allows for the amendments to be applied either retrospectively to each prior reporting period presented (the “full retrospective method”) or retrospectively as a cumulative-effect adjustment as of the date of adoption (the “modified retrospective method”). In March 2016, the FASB issued ASU

2016-08,

which clarifies the implementation guidance on principal versus agent considerations. In April 2016, the FASB issued

ASU 2016-10,

which clarifies identifying performance obligations and the licensing implementation guidance. In May 2016, the FASB issued ASU

2016-12,

which improves certain aspects of ASC Topic 606 “Revenue from Contracts with Customers.” In December 2016, the FASB issued ASU

2016-20,

which improves certain aspects of ASC Topic 606 “Revenue from Contracts with Customers.” The effective date and transition requirements for ASU

2016-08,

ASU

2016-10,

ASU

2016-12

and ASU

2016-20

are the same as the effective date and transition requirements of ASU

2014-09

(collectively, the “new revenue standard”).

Prior to the adoption of the new revenue standard effective on January 1, 2018, the Company had historically recognized revenue when risk and reward of ownership passed to the customer either upon shipment, upon product delivery at the customer’s location or upon customer acceptance, depending on the terms of the related arrangement. After the adoption of the new revenue standard effective on January 1, 2018, the Company recognizes revenue over time for foundry products that do not have an alternative use when the Company has an enforceable right to payment. As the Company adopted the new revenue standard using the modified retrospective method, it recognized the cumulative effect of initially applying the new revenue standard as an adjustment to the Company’s equity as of January 1, 2018, while prior period amounts are not adjusted and continue to be reported under the accounting standards in effect for such periods. The cumulative effect of the adjustments increased unbilled accounts receivable by $38,307 thousand and decreased inventories, net by $29,823 thousand, resulting in a net increase of $8,484 thousand in the Company’s beginning equity as of January 1, 2018. There was no net income tax impact from those cumulative effect adjustments due to full allowance on deferred tax assets.

Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense for intangible assets	$ 909	$ 819	$ 648
Estimated aggregate amortization expense of intangible assets in 2020	943
Estimated aggregate amortization expense of intangible assets in 2021	908
Estimated aggregate amortization expense of intangible assets in 2022	809
Estimated aggregate amortization expense of intangible assets in 2023	622
Estimated aggregate amortization expense of intangible assets in 2024	$ 394

Derivative Financial Instruments - Fair Values of Outstanding Zero Cost Collar and Forward Contracts Recorded as Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Zero Cost Collars [Member]
Asset Derivatives:
Other current assets	$ 1,456
Liability Derivatives:
Other current liabilities		$ 117
Forward [Member]
Liability Derivatives:
Other current liabilities		607
Other Current Assets [Member] \| Zero Cost Collars [Member]
Asset Derivatives:
Other current assets	$ 1,456
Other Current Liabilities [Member] \| Zero Cost Collars [Member]
Liability Derivatives:
Other current liabilities		117
Other Current Liabilities [Member] \| Forward [Member]
Liability Derivatives:
Other current liabilities		$ 607

Unaudited Quarterly Financial Results (Tables)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Schedule of Selected Consolidated Statements of Operations

The following tables present selected unaudited Consolidated Statements of Operations for each quarter of the years ended December 31, 2019 and 2018.


	Fiscal Year 2019
	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
	(In thousands of US dollars, except share data)
Net sales	$	157,380		$	205,145		$	229,677		$	199,993
Gross profit		22,701			43,840			60,866			53,204
Operating income (loss)	$	(18,281	)		6,746			25,923			10,035
Net income (loss)	$	(34,125	)	$	(9,520	)	$	(1,607	)	$	23,426
Earnings (loss) per share:
Basic	$	(1.00	)	$	(0.28	)	$	(0.05	)	$	0.68
Diluted	$	(1.00	)	$	(0.28	)	$	(0.05	)	$	0.54
Weighted average common stock outstanding:
Basic		34,194,878			34,245,127			34,357,745			34,542,415
Diluted		34,194,878			34,245,127			34,357,745			46,078,768

	Fiscal Year 2018
	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
	(In thousands of US dollars, except share data)
Net sales	$	165,819		$	199,685		$	206,000		$	179,394
Gross profit		44,581			53,854			55,749			43,912
Operating income		7,379			13,914			18,265			7,860
Net income (loss)	$	2,763		$	(21,505	)	$	17,222		$	(2,380	)
Earnings (loss) per share:
Basic	$	0.08		$	(0.62	)	$	0.50		$	(0.07	)
Diluted	$	0.08		$	(0.62	)	$	0.41		$	(0.07	)
Weighted average common stock outstanding:
Basic		34,253,111			34,420,654			34,573,377			34,627,292
Diluted		35,154,693			34,420,654			46,021,610			34,627,292

Accrued Expenses

12 Months Ended

Dec. 31, 2019

Payables and Accruals [Abstract]

Accrued Expenses

8. Accrued Expenses

Accrued expenses as of December 31, 2019 and 2018 are comprised of the following (in thousands):


	December 31,
	2019		2018
Payroll, benefits and related taxes, excluding severance benefits	$	16,505	$	14,548
Withholding tax attributable to intercompany interest income		23,371		20,879
Interest on senior notes		8,205		8,226
Outside service fees		898		935
Restructuring and others		3,549		—
Others		2,548		1,662

Accrued expenses	$	55,076	$	46,250

Property, Plant and Equipment - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Jun. 29, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Depreciation expenses		$ 31,820	$ 31,229	$ 27,498
Business Combination Amortized Contractual Term	10 years
Water Treatment Facilities [Member]
Property, Plant and Equipment [Line Items]
Business acquisition, assets acquired and liabilities assumed, net	$ 4,172
Net proceeds from sale leaseback facility, financing activities	$ 4,172
Sale leaseback facility, financing activities, term	10 years
Business acquisition, other current liabilities	$ 553
Business acquisition, other non-current liabilities	$ 3,619

Long-Term Borrowings - Additional Information (Detail) - USD ($)			1 Months Ended	12 Months Ended
	Jan. 17, 2017	Jul. 18, 2013	Feb. 28, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 31, 2019
Debt Instrument [Line Items]
Repurchase of common stock, shares						1,795,444
Repurchase of common stock				$ 3,107,000	$ 1,607,000	$ 11,401,000
Debt issuance costs paid						5,902,000
Interest expense related to the Exchangeable Notes						$ 5,349,000
Loss on early extinguishment of long-term borrowings, net				$ (42,000)	$ (206,000)
Exchangeable Senior Notes [Member]
Debt Instrument [Line Items]
Due date	Mar. 01, 2021
6.625% Senior Notes Due 2021 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount		$ 225,000,000
Interest rate		6.625%		6.625%	6.625%
Due date		Jul. 15, 2021		Jul. 15, 2021	Jul. 15, 2021
Aggregate principal amount of senior notes pricing		99.50%
Debt issuance costs paid		$ 5,039,000
Interest expense related to the Exchangeable Notes				$ 15,730,000	$ 15,719,000
Original debt issue discount		$ 1,125,000
Debt Instrument, Repurchased Face Amount					500,000		$ 250,000
Loss on early extinguishment of long-term borrowings, net				$ 21,000	$ 28,000
6.625% Senior Notes Due 2021 [Member] \| Senior Notes [Member] \| 2019 [Member]
Debt Instrument [Line Items]
Redemption price plus accrued, unpaid interest and special interest to the date of redemption				100.00%
5.0% Exchangeable Senior Notes due March 2021 [Member] \| Exchangeable Senior Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount	$ 86,250,000
Interest rate	5.00%			5.00%	5.00%	5.00%
Due date	Mar. 01, 2021			Mar. 01, 2021	Mar. 01, 2021
Aggregate principal amount of senior notes pricing	5.00%
Convertible notes principal amount denomination value				$ 1,000,000
Conversion of converted notes, shares issued				121.1387
Exchange price				$ 8.26
Redemption price plus accrued, unpaid interest and special interest to the date of redemption				100.00%
Minimum required percentage of holders to declare repurchase of notes				25.00%
Percentage of notes to repurchased on declaration by minimum required holders				100.00%
Debt issuance costs paid	$ 5,902,000
Interest expense related to the Exchangeable Notes				$ 5,618,000	$ 5,678,000
Debt Instrument, Repurchased Face Amount			$ 920,000		1,590,000
Loss on early extinguishment of long-term borrowings, net			$ 63,000		$ 234,000

Accrued Severance Benefits - Future Benefits Payments to Employees (Detail) $ in Thousands	Dec. 31, 2019 USD ($)
Retirement Benefits [Abstract]
2020	$ 1,066
2021	1,546
2022	1,349
2023	1,776
2024	2,630
2025 - 2029	$ 35,442

Derivative Financial Instruments - Impact of Derivative Instruments on Consolidated Statement of Operations (Detail) - Cash Flow Hedging [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Amount of Loss Recognized in AOCI on Derivatives (Effective Portion)	$ (2,894)	$ (1,589)
Other income, net [Member]
Derivative [Line Items]
Amount of Loss Recognized in Statement of Operations on Derivatives (Ineffective Portion)	(318)	(2,370)
Net Sales [Member]
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from AOCI into Statement of Operations (Effective Portion)	(4,488)	3,759
Zero Cost Collars [Member]
Derivative [Line Items]
Amount of Loss Recognized in AOCI on Derivatives (Effective Portion)	(1,096)	(747)
Zero Cost Collars [Member] \| Other income, net [Member]
Derivative [Line Items]
Amount of Loss Recognized in Statement of Operations on Derivatives (Ineffective Portion)	(193)	(276)
Zero Cost Collars [Member] \| Net Sales [Member]
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from AOCI into Statement of Operations (Effective Portion)	(2,738)	2,103
Forward [Member]
Derivative [Line Items]
Amount of Loss Recognized in AOCI on Derivatives (Effective Portion)	(1,798)	(842)
Forward [Member] \| Other income, net [Member]
Derivative [Line Items]
Amount of Loss Recognized in Statement of Operations on Derivatives (Ineffective Portion)	(125)	(190)
Forward [Member] \| Net Sales [Member]
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from AOCI into Statement of Operations (Effective Portion)	$ (1,750)	1,656
Forwards - excluded time value [Member] \| Other income, net [Member]
Derivative [Line Items]
Amount of Loss Recognized in Statement of Operations on Derivatives (Ineffective Portion)		$ (1,904)

Earnings (Loss) per Share - Schedule of Computation of Basic and Diluted Earnings (Loss) Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic Earnings (Loss) per Share
Net income (loss)	$ 23,426	$ (1,607)	$ (9,520)	$ (34,125)	$ (2,380)	$ 17,222	$ (21,505)	$ 2,763	$ (21,826)	$ (3,900)	$ 84,936
Basic weighted average common stock outstanding	34,542,415	34,357,745	34,245,127	34,194,878	34,627,292	34,573,377	34,420,654	34,253,111	34,321,888	34,469,921	33,943,264
Basic earnings (loss) per share	$ 0.68	$ (0.05)	$ (0.28)	$ (1.00)	$ (0.07)	$ 0.50	$ (0.62)	$ 0.08	$ (0.64)	$ (0.11)	$ 2.50
Diluted Earnings (Loss) per Share
Net income (loss)	$ 23,426	$ (1,607)	$ (9,520)	$ (34,125)	$ (2,380)	$ 17,222	$ (21,505)	$ 2,763	$ (21,826)	$ (3,900)	$ 84,936
Add back: Interest expense on Exchangeable Notes											5,349
Net income (loss) allocated to common stockholders									$ (21,826)	$ (3,900)	$ 90,285
Basic weighted average common stock outstanding	34,542,415	34,357,745	34,245,127	34,194,878	34,627,292	34,573,377	34,420,654	34,253,111	34,321,888	34,469,921	33,943,264
Net effect of dilutive equity awards											821,664
Net effect of assumed conversion of 5.0% Exchangeable Notes to common stock											9,990,209
Diluted weighted average common stock outstanding	46,078,768	34,357,745	34,245,127	34,194,878	34,627,292	46,021,610	34,420,654	35,154,693	34,321,888	34,469,921	44,755,137
Diluted earnings (loss) per share	$ 0.54	$ (0.05)	$ (0.28)	$ (1.00)	$ (0.07)	$ 0.41	$ (0.62)	$ 0.08	$ (0.64)	$ (0.11)	$ 2.02

Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Carrying Value [Member] \| Other Current Assets [Member]
Assets:
Derivative assets	$ 1,456
Carrying Value [Member] \| Other Current Liabilities [Member]
Liabilities:
Derivative liabilities		$ 724
Estimate of Fair Value Measurement [Member] \| Other Current Assets [Member]
Assets:
Derivative assets	1,456
Estimate of Fair Value Measurement [Member] \| Other Current Liabilities [Member]
Liabilities:
Derivative liabilities		724
Significant Other Observable Inputs (Level 2) [Member] \| Other Current Assets [Member]
Assets:
Derivative assets	$ 1,456
Significant Other Observable Inputs (Level 2) [Member] \| Other Current Liabilities [Member]
Liabilities:
Derivative liabilities		$ 724

Leases - Additional Information (Detail)	12 Months Ended
Leases - Additional Information (Detail)	Dec. 31, 2019
Maximum [Member]
Lease Agreements Remaining Term of Lease	15 years
Lessee Lease Option To Extend	10 years
Minimum [Member]
Lease Agreements Remaining Term of Lease	1 year
Lessee Lease Option To Extend	1 year

Income Taxes

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Income Taxes

17. Income Taxes

The Company’s income tax expense is composed of domestic and foreign income taxes depending on the relevant tax jurisdictions. Domestic income (loss) before taxes and income tax expense is generated or incurred in the United States, where the parent company resides.

The components of income tax expense are as follows (in thousands):


	Year Ended December 31,
	2019			2018			2017
Income (loss) before income tax expense
Domestic	$	(27,758	)	$	3,492		$	27,461
Foreign		10,679			(2,743	)		58,630

	$	(17,079	)	$	749		$	86,091

Current income tax expense (benefit)
Domestic	$	20		$	(383	)	$	(359	)
Foreign		4,679			5,010			3,680
Uncertain tax position liability (domestic)		(1	)		(2	)		(476	)
Uncertain tax position liability (foreign)		13			(46	)		(1,635	)

		4,711			4,579			1,210

Deferred income taxes expense (benefit)
Foreign		36			70			(55	)

Total income tax expense	$	4,747		$	4,649		$	1,155

Effective tax rate		—			620.6	%		1.3	%

The Company’s effective tax rates were negative for the year ended December 31, 2019, as compared to 620.6% and 1.3% for the years ended December 31, 2018 and 2017, respectively.

The differences between the annual effective tax rates and the US federal statutory rate of 21.0% in 2019 and 2018

and

35% in 2017 primarily re

late

the

non-income

based withholding tax attributable to intercompany interest income of the Company’s Dutch subsidiary, application of different tax rates associated with certain earnings from the Company’s operations outside the US, the parent Company’s interest income, which is

non-taxable

for US tax purposes

and the change of deferred tax assets and valuation allowance. The statutory income tax rate of the Company’s Korean operating subsidiary was approximately 24.2%.

The provision for domestic and foreign income taxes incurred is different from the amount calculated by applying the statutory tax rate to the net income before income taxes. The significant items causing this difference are as follows (in thousands):


	Year Ended December 31,
	2019			2018			2017
Provision computed at statutory rate	$	(3,587	)	$	157		$	30,223
State income taxes, net of federal effect		(1,068	)		46			5,445
Change in statutory tax rates		2,329			1			13,438
Difference in foreign tax rates		3,302			377			(17,789	)
Permanent differences
Derivative assets adjustment		315			(1,111	)		1,937
TPECs, hybrid and other interest		7,812			(5,555	)		(7,526	)
Thin capitalization		988			1,262			1,888
Permanent foreign currency gain (loss)		(1,734	)		(2,490	)		15,237
Penalty		151			436			4,001
Global intangible low-t a xed income (GILTI )		5,112			328			—
Other permanent differences		411			117			633
Withholding tax		3,043			3,270			3,339
Change in valuation allowance		4,382			6,260			(56,744	)
Tax credits claimed		(419	)		(416	)		(659	)
Tax credits expired		168			817			2,638
Uncertain tax positions liability		12			(48	)		(2,111	)
Change in net operating loss carry-forwards from tax au dit		—			—			6,878
NOL expired		3,780			—			—
Intercompany debt restr uct uring		(18,435	)		—			—
Others		(1,815	)		1,198			327

Income tax expense	$	4,747		$	4,649		$	1,155

The permanent differences included in Tracking Preferred Equity Certificates (TPECs), hybrid and other interest primarily relate to

non-taxable

hybrid instruments treated as debt in one country and equity in another. The permanent difference of $5,112 thousand

connec

tion with

GILTI in 2019 was

primar

ily attri

butable

to the

income

s earned by

rtain

subsidiaries

the

ompany.

During 2019, the Company completed a restructuring of its intercompany borrowings between the Company and the other entities within the group of the Company (the “Intercompany Debt Restructuring”). The main purpose of the Intercompany Debt Restructuring is to simplify the intercompany debt structure of the group in order to align with the anti-hybrid mismatch provision mandated by the Organization for Economic

Co-operation

and Development (OECD). A portion of hybrid instruments issued by the Company’s Luxembourg subsidiary to its parent in the US were subject to the Intercompany Debt Restructuring. The Company recorded a net deferred tax asset of $18,435 thousand related to the unrealized foreign exchange translation loss, which was attributable to the changes in the balances of hybrid instruments that are denominated in Euros. However, there was no impact on the provision for income taxes due to a full valuation allowance against the deferred tax assets of the Company’s Luxembourg subsidiary.

A summary of the composition of net deferred income tax assets (liabilities) as of December 31, 2019 and 2018 are as follows (in thousands):


	Year Ended December 31,
	2019			2018
Deferred tax assets
Inventory reserves	$	4,869		$	8,274
Derivative liabilities		—			175
Accrued expenses		3,384			3,210
Product warranties		190			67
Other reserves		303			187
Property, plant and equipment		7,979			8,797
Intangible assets		5			12
Accumulated severance benefits		36,841			36,166
Foreign currency translation loss		20,544			28,718
NOL carry-forwards		150,954			164,824
Tax credit		17,054			18,352
Other long-term payable		3,023			3,634
Interest expense deduction limitation		5,244			4,026
Others		4,240			3,455

Total deferred tax assets		254,630			279,897
Less: Valuation allowance		(246,224	)		(248,633	)

		8,406			31,264

Deferred tax liabilities
Derivative assets		352			—
Foreign currency translation gain		—			17,777
Prepaid expense		3,090			3,612
Others		4,810			9,660

Total deferred tax liabilities		8,252			31,049

Net deferred tax assets	$	154		$	215

Net deferred tax assets reported in
Other non-current assets	$	154		$	215

The valuation allowances at December 31, 2019 and 2018 are primarily attributable to deferred tax assets for the uncertainty in taxable income at certain of the Company’s foreign subsidiaries, including its Korean operating subsidiary.

Changes in valuation allowance for deferred tax assets for the years ended December 31, 2019, 2018 and 2017 are as follows (in thousands):


	Year Ended December 31,
	2019			2018			2017
Beginning balance	$	248,633		$	251,132		$	281,473
Charged to expense		7,912			7,653			(54,816	)
NOL/tax credit claimed/expired		(3,529	)		(1,393	)		(1,928	)
Translation adjustments		(6,792	)		(8,759	)		26,403

Ending balance	$	246,224		$	248,633		$	251,132

The evaluation of the recoverability of the deferred tax asset and the need for a valuation allowance requires the Company to weigh all positive and negative evidence to reach a conclusion that it is more likely than not that all or some portion of the deferred tax asset will not be realized. The weight given to the evidence is commensurate with the extent to which it can be objectively verified. The more negative evidence that exists, the more positive evidence is necessary and the more difficult it is to support a conclusion that a valuation allowance is not needed. Realization of the future tax benefits related to the deferred tax assets is dependent on many factors, including the Company’s ability to generate future taxable income within the period during which the temporary differences reverse, the outlook for the economic environment in which the Company operates and the overall future industry outlook.

As of December 31, 2019 and 2018, the Company had net deferred tax assets of $154 thousand and $215 thousand, respectively, mainly related to the Company’s Japanese subsidiary. As of December 31, 2019, 2018 and 2017, the Company recorded a valuation allowance of $246,224 thousand, $248,633 thousand and $251,132 thousand on its deferred tax assets related to temporary differences, net operating loss carry-forwards and tax credits of domestic and foreign subsidiaries. The Company recorded these valuation allowances on deferred tax assets based on its assessment that the negative evidence of expected losses in early future years outweighs the positive evidence of historical income.

As of December 31, 2019, the Company had approximately $708,885 thousand of net operating loss carry-forwards available to offset future taxable income, of which $204,248 thousand is associated with the Company’s Korean subsidiary, which expires from 2024 through 2026. The net operating loss of $295,171 thousand associated with the Company’s Luxembourg subsidiary is mainly attributable to certain expenses incurred in connection with its shareholding in the Company’s Dutch subsidiary. Although this net operating loss amount is carried forward indefinitely, it will be recaptured on future capital gain. The remaining net operating loss mainly relates to the US parent company and its domestic subsidiary and substantially most of the net operating loss expires at various dates through 2039. The Company utilized net operating loss of $30,945 thousand, $24,123 thousand and $3,217 thousand for the years ended December 31, 2019, 2018 and 2017, respectively. The Company also has Korean, Dutch and U.S. tax credit carry-forwards of approximately $3,028 thousand, $14,018 thousand and $9 thousand, respectively, as of December 31, 2019. The Korean tax credits expire at various dates starting from 2020 to 2024 and the Dutch tax credits are carried forward to be used for an indefinite period of time.

United States Tax Reform

On December 22, 2017, H.R. 1, originally known as the Tax Cuts and Jobs Act in the US was enacted (the “Tax Reform”). The Tax Reform reduce

the US federal statutory rate to 21.0% from 35.0% effective January 1, 2018. The Tax Reform contains several key provisions that affect the Company’s assessment on its deferred taxes, which include the remeasurement of deferred taxes, recognition of liabilities for taxes on mandatory deemed repatriations and certain other foreign income, and reassessment of the realizability of deferred tax assets. As of December 31, 2017, the Company remeasured its deferred tax assets and liabilities at the reduced rate of 21%, assessed the realizability of remeasured deferred tax assets and reduced its net deferred tax assets by $13,438 thousand in 2017.

The Company reviewed the tax impact of the Tax Reform, including guidance and proposed regulations issued in 2019, resulting in an inclusion of GILTI of $24,344 thousand for US income tax purposes. The Company elected to account for the tax on GILTI as a period cost and not record the deferred tax. Therefore, the inclusion of GILTI did not impact the Company’s consolidated financial statements for the year ended December 31, 2019 due to the net operating loss carry-forwards available for the Company.

Uncertainty in Income Taxes

The Company and its subsidiaries file income tax returns in Korea, Japan, Taiwan, the US and in various other jurisdictions. The Company is subject to income- or

non-income

tax examinations by tax authorities of these jurisdictions for all open tax years.

As of December 31, 2019, 2018 and 2017, the Company recorded $445 thousand, $426 thousand and $475 thousand of unrecognized tax benefits, respectively.

A tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of each period is as follows (in thousands):


	Year Ended December 31,
	2019			2018			2017
Unrecognized tax benefits, balance at the beginning	$	426		$	475		$	1,768
Additions based on tax positions related to the current year		13			10			10
Reductions for tax positions of prior years		(1	)		—			(676	)
Lapse of statute of limitations		—			(51	)		(735	)
Translation adjustments		7			(8	)		108

Unrecognized tax benefits, balance at the ending	$	445		$	426		$	475

The accrued interest and penalties totaled $0, $0 and $8 thousand as of December 31, 2019, 2018 and 2017, respectively.

The Company is currently unaware of any uncertain tax positions that could result in significant additional payments, accruals, or other material deviation

s from

this estimate over the next 12 months.

Other Matter

In September 2017, the Company’s Korean subsidiary was notified that the

Korean National Tax Service (the “KNTS”)

would be examining its income- and

non-income-based

taxes for its 2012 to 2014 tax years. The KNTS conducted its audit, primarily focusing on

non-income-based

VAT transactions associated with the periods with respect to which the Company previously restated the Company’s consolidated financial statements as a result of the independent investigation commenced by the Company’s Audit Committee in January 2014 (the “Restatement”).

As a result, the aggregate tax and penalty assessment by the KNTS was $6,030 thousand, of which $3,336 thousand had already been accrued by the Company in its

2015

consolidat

financial statements in connection with the Restatement filed in 2015. Such amount also included $548 thousand related to employee withholding amounts and associated penalties, and to the extent any such tax obligation was that of the Company’s Korean subsidiary’s employees, the Company expects to seek reimbursement of the applicable amounts from those employees. In addition,

the

KNTS assessed an administrative fine of $2,034 thousand in connection with the above-described tax audit.

During the fourth quarter of 2017, the Company recorded the $4,179 thousand related to this additional tax assessment and associated penalties and administrative fine as selling, general and administrative expenses in its consolidated statements of operations for the year ended December 31, 2017 and recorded the $548 thousand related to employee withholding amounts as other receivables in

the

consolidated balance sheets as of December 31, 2017 as the Company expects to seek reimbursement of the applicable amounts from those employees. Of the $548 thousand, the Company has collected $118 thousand and established an allowance of $430 thousand, which it has recorded as a selling, general and administrative expense for the three months ended September 30, 2018.

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Components of Income Tax Expense

The components of income tax expense are as follows (in thousands):


	Year Ended December 31,
	2019			2018			2017
Income (loss) before income tax expense
Domestic	$	(27,758	)	$	3,492		$	27,461
Foreign		10,679			(2,743	)		58,630

	$	(17,079	)	$	749		$	86,091

Current income tax expense (benefit)
Domestic	$	20		$	(383	)	$	(359	)
Foreign		4,679			5,010			3,680
Uncertain tax position liability (domestic)		(1	)		(2	)		(476	)
Uncertain tax position liability (foreign)		13			(46	)		(1,635	)

		4,711			4,579			1,210

Deferred income taxes expense (benefit)
Foreign		36			70			(55	)

Total income tax expense	$	4,747		$	4,649		$	1,155

Effective tax rate		—			620.6	%		1.3	%

Difference Between Provision for Domestic and Foreign Income Taxes and Amount Calculated by Statutory Tax Rate to Net Income Before Income Taxes


	Year Ended December 31,
	2019			2018			2017
Provision computed at statutory rate	$	(3,587	)	$	157		$	30,223
State income taxes, net of federal effect		(1,068	)		46			5,445
Change in statutory tax rates		2,329			1			13,438
Difference in foreign tax rates		3,302			377			(17,789	)
Permanent differences
Derivative assets adjustment		315			(1,111	)		1,937
TPECs, hybrid and other interest		7,812			(5,555	)		(7,526	)
Thin capitalization		988			1,262			1,888
Permanent foreign currency gain (loss)		(1,734	)		(2,490	)		15,237
Penalty		151			436			4,001
Global intangible low-t a xed income (GILTI )		5,112			328			—
Other permanent differences		411			117			633
Withholding tax		3,043			3,270			3,339
Change in valuation allowance		4,382			6,260			(56,744	)
Tax credits claimed		(419	)		(416	)		(659	)
Tax credits expired		168			817			2,638
Uncertain tax positions liability		12			(48	)		(2,111	)
Change in net operating loss carry-forwards from tax au dit		—			—			6,878
NOL expired		3,780			—			—
Intercompany debt restr uct uring		(18,435	)		—			—
Others		(1,815	)		1,198			327

Income tax expense	$	4,747		$	4,649		$	1,155

Summary of Composition of Net Deferred Income Tax Assets (Liabilities)

A summary of the composition of net deferred income tax assets (liabilities) as of December 31, 2019 and 2018 are as follows (in thousands):


	Year Ended December 31,
	2019			2018
Deferred tax assets
Inventory reserves	$	4,869		$	8,274
Derivative liabilities		—			175
Accrued expenses		3,384			3,210
Product warranties		190			67
Other reserves		303			187
Property, plant and equipment		7,979			8,797
Intangible assets		5			12
Accumulated severance benefits		36,841			36,166
Foreign currency translation loss		20,544			28,718
NOL carry-forwards		150,954			164,824
Tax credit		17,054			18,352
Other long-term payable		3,023			3,634
Interest expense deduction limitation		5,244			4,026
Others		4,240			3,455

Total deferred tax assets		254,630			279,897
Less: Valuation allowance		(246,224	)		(248,633	)

		8,406			31,264

Deferred tax liabilities
Derivative assets		352			—
Foreign currency translation gain		—			17,777
Prepaid expense		3,090			3,612
Others		4,810			9,660

Total deferred tax liabilities		8,252			31,049

Net deferred tax assets	$	154		$	215

Net deferred tax assets reported in
Other non-current assets	$	154		$	215

Changes in Valuation Allowance for Deferred Tax Assets

Changes in valuation allowance for deferred tax assets for the years ended December 31, 2019, 2018 and 2017 are as follows (in thousands):


	Year Ended December 31,
	2019			2018			2017
Beginning balance	$	248,633		$	251,132		$	281,473
Charged to expense		7,912			7,653			(54,816	)
NOL/tax credit claimed/expired		(3,529	)		(1,393	)		(1,928	)
Translation adjustments		(6,792	)		(8,759	)		26,403

Ending balance	$	246,224		$	248,633		$	251,132

Reconciliation of Total Amounts of Unrecognized Tax Benefits

As of December 31, 2019, 2018 and 2017, the Company recorded $445 thousand, $426 thousand and $475 thousand of unrecognized tax benefits, respectively.

A tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of each period is as follows (in thousands):


	Year Ended December 31,
	2019			2018			2017
Unrecognized tax benefits, balance at the beginning	$	426		$	475		$	1,768
Additions based on tax positions related to the current year		13			10			10
Reductions for tax positions of prior years		(1	)		—			(676	)
Lapse of statute of limitations		—			(51	)		(735	)
Translation adjustments		7			(8	)		108

Unrecognized tax benefits, balance at the ending	$	445		$	426		$	475

Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 441,643	$ 438,714
Less: accumulated depreciation	(273,959)	(251,962)
Property, plant and equipment, net	182,574	202,171
Buildings and Related Structures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	68,828	70,665
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	327,677	323,325
Finance Lease Right Of Use Assets [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,457
Others [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	42,681	44,724
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 14,890	$ 15,419

Foreign Currency Gain (Loss), Net

12 Months Ended

Dec. 31, 2019

Foreign Currency [Abstract]

Foreign Currency Loss,

16. Foreign Currency Gain (Loss), Net

Net foreign currency gain or loss includes

non-cash

translation gain or loss associated with intercompany balances. A substantial portion of the Company’s net foreign currency gain or loss is

non-cash

translation gain or loss associated with intercompany long-term loans to our Korean subsidiary. The loans are denominated in US dollars and are affected by changes in the exchange rate between the Korean won and the US dollar. As of December 31, 2019, 2018 and 2017, the outstanding intercompany loan balances including accrued interest between the Korean subsidiary and the Dutch subsidiary were $686,485 thousand, $666,597 thousand and $677,267 thousand, respectively. The Korean won to US dollar exchange rates were 1,157.8:1, 1,118.1:1 and 1,071.4:1 using the first base rate as of December 31, 2019, 2018 and 2017, respectively, as quoted by the KEB Hana Bank.

Business, Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) Segments BusinessLines	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)	Jan. 01, 2018 USD ($)	Dec. 31, 2016 USD ($)
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of operating segments \| Segments	2
Cash equivalents, highly liquid investments original maturity date	three months or less
Percentage of employees eligible for severance benefits	98.00%
Shipping and handling cost	$ 611,584	$ 552,802	$ 491,779
Advertising expense	$ 134	121	95
Percentage of tax benefit realized upon settlement	50.00%
'Adjustment to increase the assets and liabilities		8,484
Unbilled accounts receivable	$ 17,094	38,181			$ 38,307
Inventory, Net	73,267	71,611			29,823
Total stockholders' equity (deficit)	$ (14,981)	(17,310)	(39,637)		8,484	$ (72,114)
Payment terms, description	The standard payment terms with customers are generally thirty to sixty days from the time of shipment, product delivery to the customer’s location or customer acceptance, depending on the terms of the related arrangement.
Contract duration, description	Substantially all of the Company’s contracts are one year or less in duration.
Amounts billed to customers	$ 34,910
Deferred revenue	1,422	6,477			$ 8,335
Deferred revenue recognized	1,885	3,496
Contract with customer amount refunded	4,428
Allowance on unbilled accounts receivable	627
Other Current Assets [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Prepayments to suppliers	$ 6,593	8,132
Other Current Liabilities [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Other current liabilities (Notes 1)		4,671
Adjustments for New Accounting Pronouncement [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
'Adjustment to increase the assets and liabilities				$ 16,387
Minimum [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of Intangible assets	1 year
Payment terms	30 days
Maximum [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of Intangible assets	5 years
Payment terms	60 days
Maximum [Member] \| Intellectual Property Assets [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of Intangible assets	10 years
Shipping and Handling [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Shipping and handling cost	$ 1,769	$ 1,861	$ 1,652
Standard Products Group [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of business lines \| BusinessLines	2

Fair Value Measurements - Schedule of Fair Value of Long-term Borrowings (Parenthetical) (Detail)			12 Months Ended
	Jan. 17, 2017	Jul. 18, 2013	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Exchangeable Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Due date	Mar. 01, 2021
5.0% Exchangeable Senior Notes due March 2021 [Member] \| Exchangeable Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate	5.00%		5.00%	5.00%	5.00%
Due date	Mar. 01, 2021		Mar. 01, 2021	Mar. 01, 2021
6.625% Senior Notes Due 2021 [Member] \| Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate		6.625%	6.625%	6.625%
Due date		Jul. 15, 2021	Jul. 15, 2021	Jul. 15, 2021

Equity Incentive Plans - Number and Weighted Average Grant-Date Fair Value of Unvested Stock Options (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Outstanding Beginning Balance, Number of Options	130,191	475,925	897,421
Granted options during the period, Number			70,865
Vested options during the period, Number	(107,100)	(313,160)	(455,301)
Forfeited options during the period, Number	(345)	(14,738)	(19,031)
Exercised options during the period, Number	(22,746)	(17,836)	(18,029)
Outstanding Ending Balance, Number of Options	0	130,191	475,925
Unvested options at the beginning of the period, Weighted Average Grant-Date Fair Value	$ 1.54	$ 2.19	$ 1.72
Granted options during the period, Weighted Average Grant-Date Fair Value			5.02
Vested options during the period, Weighted Average Grant-Date Fair Value	1.54	2.51	1.74
Forfeited options during the period, Weighted Average Grant-Date Fair Value	1.54	1.73	1.77
Exercised options during the period, Weighted Average Grant-Date Fair Value	$ 1.54	1.66	1.59
Unvested options at the end of the period, Weighted Average Grant-Date Fair Value		$ 1.54	$ 2.19

Accounts Receivable - Additional Information (Detail) - Trade Accounts Receivable [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sale of accounts receivable	$ 14,474	$ 25,266	$ 18,973
Selling, General and Administrative Expenses [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre-tax losses on accounts receivable	$ 45	$ 63	$ 55

Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Loss

Accumulated other comprehensive loss consists of the following at December 31, 2019 and 2018, respectively (in thousands):


	Year Ended December 31,
	2019			2018
Foreign currency translation adjustments	$	(4,205	)	$	(20,061	)
Derivative adjustments		1,545			(49	)

Total	$	(2,660	)	$	(20,110	)

Changes in Accumulated Other Comprehensive Loss

Changes in accumulated other comprehensive loss for the years ended December 31, 2019, 2018 and 2017 are as follows (in thousands):


Year Ended December 31, 2019	Foreign currency translation adjustments			Derivative adjustments			Total
Beginning balance	$	(20,061	)	$	(49	)	$	(20,110	)

Other comprehensive income (loss) before reclassifications		15,856			(2,894	)		12,962
Amounts reclassified from accumulated other comprehensive loss		—			4,488			4,488

Net current-period other comprehensive income		15,856			1,594			17,450

Ending balance	$	(4,205	)	$	1,545		$	(2,660	)


Year Ended December 31, 2018	Foreign currency translation adjustments			Derivative adjustments			Total
Beginning balance	$	(38,413	)	$	5,299		$	(33,114	)

Other comprehensive income (loss) before reclassifications		18,352			(1,589	)		16,763
Amounts reclassified from accumulated other comprehensive income		—			(3,759	)		(3,759	)

Net current-period other comprehensive income (loss)		18,352			(5,348	)		13,004

Ending balance	$	(20,061	)	$	(49	)	$	(20,110	)


Year Ended December 31, 2017	Foreign currency translation adjustments			Derivative adjustments			Total
Beginning balance	$	14,460		$	(436	)	$	14,024

Other comprehensive income (loss) before reclassifications		(52,873	)		7,736			(45,137	)
Amounts reclassified from accumulated other comprehensive income		—			(2,001	)		(2,001	)

Net current-period other comprehensive income (loss)		(52,873	)		5,735			(47,138	)

Ending balance	$	(38,413	)	$	5,299		$	(33,114	)

Inventories - Additional Information (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Legacy Display Products [Member]
Inventory reserves	$ 5,475

Leases - Other lease information (Detail) $ in Thousands	12 Months Ended
Leases - Other lease information (Detail) $ in Thousands	Dec. 31, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 3,154
Operating cash flows from finance leases	178
Financing cash flows from finance leases	$ 233
Weighted average remaining lease term
Operating leases	12 years 6 months
Finance leases	10 years 4 months 24 days
Weighted average discount rate
Operating leases	7.95%
Finance leases	7.95%

Income Taxes - Changes in Valuation Allowance for Deferred Tax Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Beginning balance	$ 248,633	$ 251,132	$ 281,473
Charged to expense	7,912	7,653	(54,816)
NOL/tax credit claimed/expired	(3,529)	(1,393)	(1,928)
Translation adjustments	(6,792)	(8,759)	26,403
Ending balance	$ 246,224	$ 248,633	$ 251,132

Long-term Borrowings

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Long-term Borrowings

11. Long-Term Borrowings

Long-term borrowings as of December 31, 2019 and 2018 are as follows (in thousands):


	December 31,
	2019			2018
5.0% Exchangeable Senior Notes due March 2021	$	83,740		$	84,660
6.625% S enior N otes due July 2021	$	224,250		$	224,500
Less: unamortized discount and debt issuance costs		(3,247	)		(5,583	)

Long-term borrowings, net of unamortized discount and debt issuance costs	$	304,743		$	303,577

5.0% Exchangeable Senior Notes

On January 17, 2017, MagnaChip Semiconductor S.A. closed the Exchangeable Notes Offering of $86,250 thousand aggregate principal amount of 5.0% Exchangeable Notes. Interest on the Exchangeable Notes accrues at a rate of 5.0% per annum, payable semi-annually on March 1 and September 1 of each year, beginning on March 1, 2017. The Exchangeable Notes will mature on March 1, 2021, unless earlier repurchased or converted. Holders may convert their notes at their option at any time prior to the close of business on the business day immediately preceding the stated maturity date.

The Company used a portion of the net proceeds from the issuance to repurchase 1,795,444 shares of common stock under its stock repurchase program at an aggregate cost of $11,401 thousand.

Upon conversion, the Company will deliver for each $1,000 principal amount of converted notes a number of shares equally to the exchange rate, which will initially be 121.1387 shares of common stock per $1,000 principal amount of Exchangeable Notes, equivalent to an initial exchange price of approximately $8.26 per share of common stock. The exchange rate will be subject to adjustment in some circumstances, but will not be adjusted for any accrued and unpaid interest. In addition, if a “make-whole fundamental change” (as defined in the Exchangeable Notes indenture (the “Exchangeable Notes Indenture”)) occurs prior to the stated maturity date, the Company will increase the exchange rate for a holder who elects to convert its notes in connection with such make-whole fundamental change in certain circumstances. MagnaChip Semiconductor S.A. may also, under certain circumstances, be required to pay additional amounts to holders of Exchangeable Notes if withholding or deduction is required in a relevant tax jurisdiction.

If the Company undergoes a fundamental change, subject to certain conditions, holders may require the Company to repurchase for cash all or part of their notes at a purchase price equal to 100% of the principal amount of the notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change purchase date. In addition, upon certain events of default described in the Exchangeable Notes Indenture, the trustee or holders of at least 25% principal amount of the Exchangeable Notes may declare 100% of the then outstanding Exchangeable Notes due and payable in full, together with all accrued and unpaid interest thereon. Payment of principal on the Exchangeable Notes may also accelerate and become automatically due and payable upon certain events of default involving bankruptcy or insolvency proceedings involving the Company, MagnaChip Semiconductor S.A. and their significant subsidiaries. The Exchangeable Notes are not redeemable at the option of MagnaChip Semiconductor S.A. prior to the maturity date.

The Exchangeable Notes Indenture contains covenants that limit the ability of the Company, MagnaChip Semiconductor S.A. and the Company’s other restricted subsidiaries to: (i) declare or pay any dividend or make any payment or distribution on account of or purchase or redeem the Company’s capital stock or equity interests of the restricted subsidiaries; (ii) make any principal payment on, or redeem or repurchase, prior to any scheduled repayment or maturity, any subordinated indebtedness; (iii) make certain investments; (iv) incur additional indebtedness and issue certain types of capital stock; (v) create or incur any lien (except for permitted liens) that secures obligations under any indebtedness; (vi) merge with or into or sell all or substantially all of the Company’s assets to other companies; (vii) enter into certain types of transactions with affiliates; (viii) guarantee the payment of any indebtedness; and (ix) designate unrestricted subsidiaries.

These covenants are subject to a number of exceptions and qualifications. Certain of these restrictive covenants will terminate if the Exchangeable Notes are rated investment grade at any time.

The Company incurred debt issuance costs of $5,902 thousand related to the issuance of the Exchangeable Notes. The debt issuance costs are recorded as a direct deduction from the long-term borrowings in the consolidated balance sheets and amortized to interest expense using the effective interest method over the term of the Exchangeable Notes. Interest expense related to the Exchangeable Notes for year ended December 31, 2019 and 2018 was $5,618 thousand and $5,678 thousand, respectively.

In December 2018, the Company repurchased a principal amount equal to $1,590 thousand of the Exchangeable Notes in the open market, resulting in a loss of $234 thousand, which was recorded as loss on early extinguishment of long-term borrowings, net in the consolidated statements of operations for the year ended December 31, 2018. In February 2019, the Company repurchased a principal amount equal to $920 thousand of the Exchangeable Notes in the open market, resulting in a loss of $63 thousand, which was recorded as loss on early extinguishment of long-term borrowings, net in the consolidated statements of operations for the year ended December 31, 2019.

6.625% Senior Notes

On July 18, 2013, the Company issued a $225,000,000 aggregate principal amount of the 2021 Notes at a price of 99.5%. Interest on the 2021 Notes accrues at a rate of 6.625% per annum, payable semi-annually on January 15 and July 15 of each year, beginning on January 15, 2014.

On or after July 15, 2019, the Company can optionally redeem all or a part of the 2021 Notes at a redemption price equal to 100% of the principal amount of the notes plus accrued and unpaid interest and special interest, if any, on the notes redeemed, to the applicable date of redemption.

The Indenture relating to the 2021 Notes contains covenants that limit the ability of the Company and its restricted subsidiaries to: (i) declare or pay any dividend or make any payment or distribution on account of or purchase or redeem the Company’s capital stock or equity interests of the restricted subsidiaries; (ii) make any principal payment on, or redeem or repurchase, prior to any scheduled repayment or maturity, any subordinated indebtedness; (iii) make certain investments; (iv) incur additional indebtedness and issue certain types of capital stock; (v) create or incur any lien (except for permitted liens) that secures obligations under any indebtedness; (vi) merge with or into or sell all or substantially all of the Company’s assets to other companies; (vii) enter into certain types of transactions with affiliates; (viii) guarantee the payment of any indebtedness; (ix) enter into sale-leaseback transactions; (x) enter into agreements that would restrict the ability of the restricted subsidiaries to make distributions with respect to their equity to the Company or other restricted subsidiaries, to make loans to the Company or other restricted subsidiaries or to transfer assets to the Company or other restricted subsidiaries; and (xi) designate unrestricted subsidiaries.

These covenants are subject to a number of exceptions and qualifications. Certain of these restrictive covenants will terminate if the 2021 Notes are rated investment grade at any time.

The Company incurred original issue discount of $1,125 thousand and debt issuance costs of $5,039 thousand related to the issuance of the 2021 Notes. The original issue discount and the debt issuance costs are recorded as a direct deduction from the long-term borrowings in the consolidated balance sheets and amortized to interest expense using the effective interest method over the term of the 2021 Notes. Interest expense related to the 2021 Notes for the year ended December 31, 2019 and 2018 were $15,730 thousand and $15,719 thousand, respectively.

In December 2018, the Company repurchased a principal amount equal to $500 thousand of the 2021 Notes in the open market, resulting in a net gain of $28 thousand, which was recorded as loss on early extinguishment of long-term borrowings, net in the consolidated statements of operations for the year ended December 31, 2018. In January 2019, the Company repurchased a principal amount equal to $250 thousand of the 2021 Notes in the open market, resulting in a net gain of $21 thousand, which was recorded as loss on early extinguishment of long-term borrowings, net in the consolidated statements of operations for the year ended December 31, 2019.

Product Warranties - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Warranty Obligations [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 844

Earnings (Loss) per Share - Schedule of Computation of Basic and Diluted Earnings (Loss) Per Common Share (Parenthetical) (Detail)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 17, 2017
5.0% Exchangeable Senior Notes due March 2021 [Member] \| Exchangeable Senior Notes [Member]
Earnings Per Share [Line Items]
Conversion of exchangeable notes to common stock rate	5.00%	5.00%	5.00%	5.00%

Geographic and Segment Information - Summary of Revenue Disaggregated Depending on Timing of Revenue Recognition (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Foundry Services Group	$ 199,993	$ 229,677	$ 205,145	$ 157,380	$ 179,394	$ 206,000	$ 199,685	$ 165,819	$ 792,195	$ 750,898	$ 679,672
Foundry Services Group [Member]
Disaggregation of Revenue [Line Items]
Foundry Services Group									307,144	325,312
Revenue Recognized At The Time Of Shipment Or Delivery [Member] \| Foundry Services Group [Member]
Disaggregation of Revenue [Line Items]
Foundry Services Group									157,272	80,578
Revenue Recognized Over Time [Member] \| Foundry Services Group [Member]
Disaggregation of Revenue [Line Items]
Foundry Services Group									$ 149,872	$ 244,734

Earnings (Loss) per Share (Tables)

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Earnings (Loss) Per Common Share

The following table illustrates the computation of basic and diluted earnings (loss) per common share:


	Year Ended December 31,
	2019			2018			2017
	(In thousands of US dollars, except share data)
Basic earnings (loss) per share
Net income (loss)	$	(21,826	)	$	(3,900	)	$	84,936

Basic weighted average common stock outstanding		34,321,888			34,469,921			33,943,264
Basic earnings (loss) per share	$	(0.64	)	$	(0.11	)	$	2.50
Diluted earnings (loss) per share
Net income (loss)	$	(21,826	)	$	(3,900	)	$	84,936
Add back: Interest expense on Exchangeable Notes		—			—			5,349
Net income (loss) allocated to common stockholders	$	(21,826	)	$	(3,900	)	$	90,285

Basic weighted average common stock outstanding		34,321,888			34,469,921			33,943,264
Net effect of dilutive equity awards		—			—			821,664
Net effect of assumed conversion of 5.0% Exchangeable Notes to common stock		—			—			9,990,209

Diluted weighted average common stock outstanding		34,321,888			34,469,921			44,755,137
Diluted earnings (loss) per share	$	(0.64	)	$	(0.11	)	$	2.02

Schedule of Antidilutive Securities Excluded from the Computation of Loss Per Common Share

The following outstanding instruments were excluded from the computation of diluted loss per share, as they would have an anti-dilutive effect on the calculation:


	Year Ended December 31,
	2019		2018		2017
Options		2,177,045		2,674,756		835,572
Restricted Stock Units		1,043,303		718,213		—

Long-term Borrowings - Components of Long-term Borrowings (Parenthetical) (Detail)			12 Months Ended
	Jan. 17, 2017	Jul. 18, 2013	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Exchangeable Senior Notes [Member]
Debt Instrument [Line Items]
Due date	Mar. 01, 2021
5.0% Exchangeable Senior Notes due March 2021 [Member] \| Exchangeable Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate	5.00%		5.00%	5.00%	5.00%
Due date	Mar. 01, 2021		Mar. 01, 2021	Mar. 01, 2021
6.625% Senior Notes Due July 2021 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate		6.625%	6.625%	6.625%
Due date		Jul. 15, 2021	Jul. 15, 2021	Jul. 15, 2021

Equity Incentive Plans - Assumptions used in Black-Scholes Option-Pricing Model on Weighted Average Basis (Detail)	12 Months Ended
	Dec. 31, 2017 $ / shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Grant-date fair value of option	$ 5.02
Expected term	2 years 6 months
Risk-free interest rate	1.20%
Expected volatility	81.70%

Intangible Assets

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

6. Intangible Assets

Intangible assets as of December 31, 2019 and 2018 are comprised of the following (in thousands):


	December 31, 2019
	Gross amount		Accumulated amortization			Net amount
Technology	$	18,688	$	(18,688	)	$	—
Customer relationships		26,838		(26,838	)		—
Intellectual property assets		12,278		(8,264	)		4,014

Intangible assets, net	$	57,804	$	(53,790	)	$	4,014


	December 31, 2018
	Gross amount		Accumulated amortization			Net amount
Technology	$	19,350	$	(19,350	)	$	—
Customer relationships		27,791		(27,791	)		—
Intellectual property assets		11,571		(7,618	)		3,953

Intangible assets, net	$	58,712	$	(54,759	)	$	3,953

Aggregate amortization expense for intangible assets totaled $909 thousand, $819 thousand and $648 thousand for the years ended December 31, 2019, 2018 and 2017, respectively. The aggregate amortization expense of intangible assets for the next five years are estimated to be $

943

thousand, $

908

thousand, $

809

thousand, $

622

thousand and $

394

thousand, for the years ended December 31, 2020, 2021, 2022, 2023 and 2024, respectively.

Accrued Severance Benefits - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019
Percentage of employees eligible for severance benefits	98.00%
Korea [Member] \| Maximum [Member]
Retirement age of employees	60 years

Derivative Financial Instruments - Offsetting of Derivative Liabilities (Detail) $ in Thousands	Dec. 31, 2018 USD ($)
Zero Cost Collars [Member]
Derivative [Line Items]
Liability Derivatives, Gross amounts of recognized liabilities	$ 117
Liability Derivatives, Net amounts of liabilities presented in the balance sheets	117
Liability Derivatives, Gross amounts not offset in the balance sheets, Cash collateral pledged	(360)
Liability Derivatives, Net amount after master netting	(243)
Foreign Exchange Forward [Member]
Derivative [Line Items]
Liability Derivatives, Gross amounts of recognized liabilities	607
Liability Derivatives, Net amounts of liabilities presented in the balance sheets	607
Liability Derivatives, Gross amounts not offset in the balance sheets, Cash collateral pledged	(1,450)
Liability Derivatives, Net amount after master netting	$ (843)

Restructuring and Other Charges (Gains)

12 Months Ended

Dec. 31, 2019

Restructuring and Related Activities [Abstract]

Restructuring and Other Charges (Gains)

14. Restructuring and Other Charges (Gains)

On February 14, 2019, the Company announced that the Company has undertaken a strategic evaluation of the Company’s Foundry Services Group business and the fabrication facility located in Cheongju (“Fab 4”), the larger of the Company two

8-inch

manufacturing facilities. The Company has engaged J.P. Morgan Securities LLC as the Company’s financial advisor to assist in the evaluation and the Company has also retained legal advisors to assist in the evaluation. For the year ended December 31, 2019, the Company recorded $6,991 thousand in professional fees and other related charges incurred in connection with the strategic evaluation and recorded such costs as restructuring and other charges in the Company’s consolidated statements of operations. The Company also recorded $2,151 thousand and $53 thousand restructuring-related charges in the first and the fourth quarter of 2019, respectively.

As of December 21, 2016, the Company entered into a purchase and sale agreement to sell a building located in Cheongju, South Korea. The building has historically been used to house the Company’s

six-inch

fabrication facility in Cheongju, South Korea (the

“6-inch

fab”) and became vacant upon the closure of the fabrication facility in February 2016. As of December 31, 2015, the building was fully impaired. The Company received proceeds of $18,204 thousand, including a $1,655 thousand value-added tax, for the sale of the building in December 2016. As the Company was obligated to perform certain removal construction work, it recorded the $18,204 thousand proceeds as restricted cash and $16,549 thousand as deposits received in its consolidated balance sheets as of December 31, 2016. During the first quarter of 2017, the Company completed all removal construction work necessary to transfer the title of the building, and the $18,204 thousand of restricted cash was fully released. Accordingly, the Company recorded $16,635 thousand as restructuring gain in the consolidated statements of operations for the three months ended March 31, 2017.

In March 2017, the Company sold its sensor product business, which was included in and reported as part of Display Solutions line of its Standard Products Group, to a third party for proceeds of $1,295 thousand, in an effort to improve our overall profitability. The Company recorded $375 thousand net gain from this sale after deducting the book values of certain assets transferred to the buyer.

Equity Incentive Plans - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	9,347,000
Number of shares reserved for future issuance	987,000
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation expense	$ 6,939	$ 4,096	$ 1,601
Unrecognized compensation cost related to unvested restricted stock units	$ 4,289
Unrecognized compensation cost, period for recognition	6 months
Fair value of restricted stock units vested	$ 5,817	2,647	2,107
Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation expense	13	313	734
Unrecognized compensation cost related to stock options	0
Weighted average grant-date fair value of vested options	$ 165	$ 786	$ 794

Leases

12 Months Ended

Dec. 31, 2019

Leases [Abstract]

Leases

7. Leases

The Company has operating and finance leases for land, buildings and other assets such as vehicles and office equipment. The Company’s leases have remaining lease terms ranging from 1 year to 15 years. For certain leases, the Company has options to extend the lease term for additional periods ranging from 1 year to 10 years.

The Company’s land lease payment is subject to a biennial adjustment (based on change of the Consumer Price Index), the impact of which is treated as a variable lease payment.

The Company adopted the new lease accounting standard as of January 1, 2019, using the modified retrospective transition method. The tables below present financial information related to the Company’s leases.

Supplemental balance sheet information related to leases is as follows (in thousands):


Leases	Classification	As of December 31, 2019
Assets
Operating lease	Operating lease right-of-use assets	$	11,482
Finance lease	Property, plant and equipment, net		2,151

Total leased assets		$	13,633

Liabilities
Current
Operating	Operating lease liabilities	$	2,036
Finance	Other current liabilities		252
Non-current
Operating	Non-current operating lease liabilities		9,446
Finance	Other non-current liabilities		1,971

Total lease liabilities		$	13,705

The components of lease cost included in the Company’s consolidated statements of operations, are as follows (in thousands):


	Year Ended December 31, 2019
Operating lease cost	$	3,154
Finance lease cost
Amortization of right-of-use assets		303
Interest on lease liabilities		178

Total lease cost	$	3,635

The above table does not include an immaterial cost of short-term leases and a variable lease payment during the year ended December 31, 2019.

Other lease information is as follows (in thousands):


	Year Ended December 31, 2019
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$	3,154
Operating cash flows from finance leases		178
Financing cash flows from finance leases		233


	As of December 31, 2019
Weighted average remaining lease term
Operating leases		12.5 years
Finance leases		10.4 years
Weighted average remaining lease rate
Operating leases		7.95	%
Finance leases		7.95	%

The aggregate future lease payments for operating and finance leases as of December 31, 2019 are as follows (in thousands):


	Operating Leases			Finance Leases
2020	$	2,843		$	413
2021		1,355			413
2022		1,096			413
2023		1,088			413
2024		1,088			150
Thereafter		10,618			1,463

Total future lease payments		18,088			3,265
Less: Imputed interest		(6,606	)		(1,042	)

Present value of future payments	$	11,482		$	2,223

As of December 31, 2018, the minimum aggregate rental payments due under

non-cancelable

operating lease contracts are as follows (in thousands):


2019	$	4,319
2020		3,569
2021		1,570
2022		1,319
2023		1,309
2024 and thereafter		13,978

	$	26,064

Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Estimated amount reclassified from accumulated other comprehensive income into income, period									12 months
Estimated amount reclassified from accumulated other comprehensive income into income									$ 1,545
Revenues	$ 199,993	$ 229,677	$ 205,145	$ 157,380	$ 179,394	$ 206,000	$ 199,685	$ 165,819	792,195	$ 750,898	$ 679,672
Accounting Standards Update 2014-09 [Member]
Derivative [Line Items]
Revenues									98
Zero Cost Collar and Forward Contracts [Member] \| Nomura Financial Investment (Korea) Co., Ltd. [Member]
Derivative [Line Items]
Deposit with counterparty	8,750				4,000				8,750	4,000
Threshold amount of cash collateral	500								500
Cash collateral for credit exposure in derivatives	1,070				$ 1,810				1,070	$ 1,810
Termination provisions for cash and cash equivalents	$ 30,000								$ 30,000
Debt Instrument, Credit Rating									B-/B3

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2019
Loss Contingencies [Line Items]
Initial term of leases			20 years
Renewal terms of leases			10 years
Notice period upon cancellation of leases			90 days
Shareholder Derivative Actions [Member]
Loss Contingencies [Line Items]
Proceeds from insurance settlement		$ 3,000
Securities and Exchange Commission Actions [Member]
Loss Contingencies [Line Items]
Attorneys' fee and litigation expenses	$ 3,000

Fair Value Measurements - Schedule of Fair Value of Long-term Borrowings (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Long-term Borrowings:
Carrying amount of senior notes	$ 304,743	$ 303,577
5.0% Exchangeable Senior Notes due March 2021 [Member] \| Exchangeable Senior Notes [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Long-term Borrowings:
Carrying amount of senior notes	81,959	81,418
Estimated fair value of senior notes	116,078	86,835
6.625% Senior Notes Due 2021 [Member] \| Senior Notes [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Long-term Borrowings:
Carrying amount of senior notes	222,784	222,159
Estimated fair value of senior notes	$ 224,250	$ 202,046

Derivative Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Details of Derivative Contracts

Details of derivative contracts as of December 31, 2019 are as follows (in thousands):


Date of transaction	Type of derivative	Total notional amount		Month of settlement
August 13, 2019	Zero cost collar	$	60,000	January 2020 to June 2020
September 27, 2019	Zero cost collar	$	42,000	January 2020 to June 2020
December 4, 2019	Zero cost collar	$	30,000	July 2020 to December 2020

Details of derivative contracts as of December 31, 2018 are as follows (in thousands):


Date of transaction	Type of derivative	Total notional amount		Month of settlement
June 27, 2018	Zero cost collar	$	18,000	January 2019 to June 2019
June 27, 2018	Forward	$	36,000	January 2019 to June 2019

Fair Values of Outstanding Zero Cost Collar and Forward Contracts Recorded as Assets and Liabilities

The fair values of the Company’s outstanding zero cost collar and forward contracts recorded as assets and liabilities as of December 31, 2019 and 2018 are as follows (in thousands):


Derivatives designated as hedging instruments:		December 31,
Derivatives designated as hedging instruments:		2019		2018
Asset Derivatives:
Zero cost collars	Other current assets	$	1,456	$	—
Liability Derivatives:
Zero cost collars	Other current liabilities	$	—	$	117
Forward	Other current liabilities	$	—	$	607

Offsetting of Derivative Assets and Liabilities

Offsetting of derivative assets as of December 31, 2019 is as follows (in thousands):


As of December 31, 2019	Gross amounts of recognized assets		Gross amounts offset in the balance sheets		Net amounts of assets presented in the balance sheets		Gross amounts not offset in the balance sheets				Net amount
As of December 31, 2019	Gross amounts of recognized assets		Gross amounts offset in the balance sheets		Net amounts of assets presented in the balance sheets		Financial instruments		Cash collateral pledged		Net amount
Asset Derivatives:
Zero cost collars	$	1,456	$	—	$	1,456	$	—	$	1,070	$	2,526

Offsetting of Derivative Liabilities

Offsetting of derivative liabilities as of December 31, 2018 is as follows (in thousands):


As of December 31, 2018	Gross amounts of recognized liabilities		Gross amounts offset in the balance sheets		Net amounts of liabilities presented in the balance sheets		Gross amounts not offset in the balance sheets					Net amount
As of December 31, 2018	Gross amounts of recognized liabilities		Gross amounts offset in the balance sheets		Net amounts of liabilities presented in the balance sheets		Financial instruments		Cash collateral pledged			Net amount
Liability Derivatives:
Zero cost collars	$	117	$	—	$	117	$	—	$	(360	)	$	(243	)
Forward	$	607	$	—	$	607	$	—	$	(1,450	)	$	(843	)

Impact of Derivative Instruments on Consolidated Statement of Operations

The following table summarizes the impact of derivative instruments on the consolidated statements of operations for the years ended December 31, 2019 and 2018 (in thousands):


Derivatives in ASC 815 Cash Flow Hedging Relationships	Amount of Loss Recognized in AOCI on Derivatives (Effective Portion)						Location/Amount of Gain (Loss) Reclassified from AOCI Into Statement of Operations (Effective Portion)							Location/Amount of Loss Recognized in Statement of Operations on Derivatives (Ineffective Portion)(1)
Derivatives in ASC 815 Cash Flow Hedging Relationships	2019			2018					2019			2018				2019			2018
Zero cost collars	$	(1,096	)	$	(747	)		Net sales	$	(2,738	)	$	2,103		Other income, net	$	(193	)	$	(276	)
Forwards	$	(1,798	)	$	(842	)		Net sales	$	(1,750	)	$	1,656		Other income, net	$	(125	)	$	(190	)
Forwards—excluded time value(1)															Other income, net	$	—		$	(1,904	)

	$	(2,894	)	$	(1,589	)			$	(4,488	)	$	3,759			$	(318	)	$	(2,370	)

(1)

The FASB issued the new guidance about hedging activities (ASU

2017-12),

which provides new rules about income statement classification and eliminates the requirement to separately measure and report hedge ineffectiveness. In addition, under the same guidance, excluded time value for forward contracts is presented in earnings in the same income statement line item that is used to present the earnings effect of the hedged item. The Company adopted the new guidance in the first quarter of 2019 and recorded $98 thousand as a reduction of net sales for the same period, and the comparative prior period amounts were not restated and continued to be reported under the accounting standards in effect for such period.

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41620-113959

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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+ Details

Income Taxes - Summary of Composition of Net Deferred Income Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets
Inventory reserves	$ 4,869	$ 8,274
Derivative liabilities		175
Accrued expenses	3,384	3,210
Product warranties	190	67
Other reserves	303	187
Property, plant and equipment	7,979	8,797
Intangible assets	5	12
Accumulated severance benefits	36,841	36,166
Foreign currency translation loss	20,544	28,718
NOL carry-forwards	150,954	164,824
Tax credit	17,054	18,352
Other long-term payable	3,023	3,634
Interest expense deduction limitation	5,244	4,026
Others	4,240	3,455
Total deferred tax assets	254,630	279,897
Less: Valuation allowance	(246,224)	(248,633)	$ (251,132)	$ (281,473)
Deferred tax assets, net	8,406	31,264
Deferred tax liabilities
Derivative assets	352
Foreign currency translation gain (loss)		17,777
Prepaid expense	3,090	3,612
Others	4,810	9,660
Total deferred tax liabilities	8,252	31,049
Net deferred tax assets	154	215
Net deferred tax assets reported in
Other non-current assets	$ 154	$ 215

Inventories (Tables)

12 Months Ended

Dec. 31, 2019

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories as of December 31, 2019 and 2018 consist of the following (in thousands):


	Year Ended December 31,
	2019			2018
Finished goods		17,489			14,334
Semi-finished goods and work-in-process		44,040			39,135
Raw materials		17,702			21,150
Materials in-transit		—			1,890
Less: inventory reserve		(5,964	)		(4,898	)

Inventories, net	$	73,267		$	71,611

Changes in Inventory Reserve

Changes in inventory reserve for the years ended December 31, 2019, 2018 and 2017 are as follows (in thousands):


	Year Ended December 31,
	2019			2018			2017
Beginning balance	$	(4,898	)	$	(6,391	)	$	(7,177	)
Change in reserve
Inventory reserve charged to costs of sales		(13,855	)		(8,269	)		(7,017	)
Sale of previously reserved inventory		3,067			4,098			6,003

		(10,788	)		(4,171	)		(1,014	)
Write off		9,189			5,479			2,641
Translation adjustments		533			185			(841	)

Ending balance	$	(5,964	)	$	(4,898	)	$	(6,391	)

Income Taxes - Reconciliation of Total Amounts of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, balance at the beginning	$ 426	$ 475	$ 1,768
Additions based on tax positions related to the current year	13	10	10
Reductions for tax positions of prior years	(1)		(676)
Lapse of statute of limitations		(51)	(735)
Translation adjustments	7	(8)	108
Unrecognized tax benefits, balance at the ending	$ 445	$ 426	$ 475

Product Warranties - Schedule of Changes in Accrued Warranty Liabilities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Adjusted Beginning balance		$ 1,060
Beginning balance	$ 610	216	$ 466
Change in provision (reversal)	2,357	222	(224)
Usage	(1,315)	(636)	(65)
Translation adjustments	(6)	(36)	39
Ending balance	$ 1,646	$ 610	$ 216

Income Taxes - Difference Between Provision for Domestic and Foreign Income Taxes and Amount Calculated by Statutory Tax Rate to Net Income Before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Provision computed at statutory rate	$ (3,587)	$ 157	$ 30,223
State tax	(1,068)	46	5,445
Change in statutory tax rates	2,329	1	13,438
Difference in foreign tax rates	3,302	377	(17,789)
Permanent differences
Derivative assets adjustment	315	(1,111)	1,937
TPECs, hybrid and other interest	7,812	(5,555)	(7,526)
Thin capitalization	988	1,262	1,888
Permanent foreign currency gain (loss)	(1,734)	(2,490)	15,237
Penalty	151	436	4,001
Global intangible low-taxed income (GILTI)	5,112	328
Other permanent differences	411	117	633
Withholding tax	3,043	3,270	3,339
Change in valuation allowance	4,382	6,260	(56,744)
Tax credits claimed	(419)	(416)	(659)
Tax credits expired	168	817	2,638
Uncertain tax positions liability	12	(48)	(2,111)
Change in net operating loss carry-forwards from tax audit			6,878
NOL expired	3,780
Intercompany debt restructuring	(18,435)
Others	(1,815)	1,198	327
Total income tax expenses	$ 4,747	$ 4,649	$ 1,155

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Net deferred tax assets				$ 154	$ 215
Deferred tax assets, valuation allowance amount			$ 251,132	246,224	248,633	$ 251,132	$ 281,473
Net operating loss carry-forwards				$ 708,885
Net operating loss carry-forwards, expiration period				indefinite period of time
Net operating loss utilized				$ 30,945	$ 24,123	$ 3,217
Statutory income tax rate				21.00%	21.00%	35.00%
Accrued Interest and Penalities			8	$ 0	$ 0	$ 8
Income tax penalties	$ 6,030
Accrued tax penalties	3,336
Employee withholding amounts	548		548
Administrative fine related to tax audit	$ 2,034
Tax Cuts and Jobs Act, Change in Tax Rate, Income Tax Expense (Benefit)						13,438
Portion of Employee Withholding Tax Amount Collected		$ 118
UnrecognizedTaxBenefits			475	445	$ 426	$ 475	$ 1,768
Net deferred tax assets				18,435
Selling, General and Administrative Expenses [Member]
Income Tax Contingency [Line Items]
Income tax penalties			$ 4,179
Allowance For Employee Withholding Tax		$ 430
Luxembourg Subsidiary [Member]
Income Tax Contingency [Line Items]
Net operating loss carry-forwards				295,171
Effective income tax rate reconciliation permanent adjustments amount				24,344
Korean Statutory Tax Rate [Member]
Income Tax Contingency [Line Items]
Tax credit carry-forwards				$ 3,028
Net operating loss carry-forwards, expiration period				The Korean tax credits expire at various dates starting from 2020 to 2024
Dutch [Member]
Income Tax Contingency [Line Items]
Tax credit carry-forwards				$ 14,018
U.S [Member]
Income Tax Contingency [Line Items]
Tax credit carry-forwards				9
Korean Subsidiary [Member]
Income Tax Contingency [Line Items]
Net operating loss carry-forwards				$ 204,248
Net operating loss expiration date				2026
Statutory income tax rate				24.20%
Effective income tax rate reconciliation permanent adjustments amount				$ 5,112

Long-term Borrowings (Tables)

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Components of Long-term Borrowings

Long-term borrowings as of December 31, 2019 and 2018 are as follows (in thousands):


	December 31,
	2019			2018
5.0% Exchangeable Senior Notes due March 2021	$	83,740		$	84,660
6.625% S enior N otes due July 2021	$	224,250		$	224,500
Less: unamortized discount and debt issuance costs		(3,247	)		(5,583	)

Long-term borrowings, net of unamortized discount and debt issuance costs	$	304,743		$	303,577

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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+ Details

Cover Page - USD ($)	12 Months Ended
Cover Page - USD ($)	Dec. 31, 2019	Feb. 14, 2020	Jun. 30, 2019
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Amendment Flag	false
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Registrant Name	MAGNACHIP SEMICONDUCTOR Corp
Entity Central Index Key	0001325702
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 314,540,019
Trading Symbol	MX
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Incorporation, State or Country Code	DE
Entity Address, Country	LU
Security Exchange Name	NYSE
Title of 12(b) Security	Common Stock
Entity Common Stock, Shares Outstanding		34,801,312

Business, Basis of Presentation and Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Business

non-volatile

memory and Radio Frequency (“RF”) applications. The Company’s business is comprised of

two

Basis of Presentation

The consolidated financial statements are presented in accordance with accounting principles generally accepted in the United States of America (“US GAAP”).

Significant accounting policies followed by the Company in the preparation of the accompanying consolidated financial statements are summarized below.

Principles of Consolidation

The consolidated financial statements include the accounts of the Company including its wholly-owned subsidiaries. All intercompany transactions and balances are eliminated in consolidation.

Use of Estimates

Foreign Currency Translation

end-of-period

Cash and Cash Equivalents

Cash equivalents consist of highly liquid investments with an original maturity date of

three months or less

when purchased.

Accounts Receivable Reserves

Sales of Accounts Receivable

Inventories

Advances to Suppliers

The Company, from time to time, may make advances in form of prepayments or deposits to suppliers to procure materials to meet its planned production. The Company recorded advances of $

6,593

thousand and $

8,132

thousand as other current assets as of December 31, 2019 and 2018, respectively.

Property, Plant and Equipment


Buildings			30 - 40 years
Building related structures			10 - 20 years
Machinery and equipment			10 - 12 years
Others			3 - 10 years

Routine maintenance and repairs are charged to expense as incurred. Expenditures that enhance the value or significantly extend the useful lives of the related assets are capitalized.

Impairment of Long-Lived Assets

Restructuring Charges

Leases

right-of-use

assets; the related liabilities are recorded as operating lease liabilities for the current portion and

non-current

operating lease liabilities for the

non-current

portion. Finance lease

right-of-use

assets are included in property and equipment, net and the related lease liabilities are included in other current liabilities and other

non-current

liabilities on the consolidated balance sheets.

Right-of-use

assets represent the Company’s right to use an underlying asset during the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease.

Right-of-use

right-of-use

assets and interest expense on operating lease liabilities are recognized on a straight-line basis over the respective lease term.

An extension or contraction of a lease term is considered if the related option to extend or early terminate the lease is reasonably certain to be exercised by the Company. Operating lease

right-of-use

assets may also include any advance lease payments made and exclude lease incentives and initial direct costs incurred. The Company has lease agreements with lease and

non-lease

components, which are generally accounted for separately. For certain equipment leases, lease and

non-lease

components are accounted for as a single lease component.

Variable lease payment amounts that cannot be determined at the commencement of the lease such as increases in lease payments based on changes in index rates are not included in the

right-of-use

assets or liabilities. These variable lease payments are expensed as incurred.

The Company does not recognize operating lease

right-of-use

Intangible Assets

Intangible assets other than intellectual property include technology and customer relationships that are amortized on a straight-line basis over periods ranging from

one

five

years. Intellectual property assets acquired represent rights under patents, trademarks and property use rights and are amortized over their respective periods of benefit, ranging up to

ten

years, on a straight-line basis.

Fair Value Disclosures of Financial Instruments

Level 1—Inputs are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date.

Accrued Severance Benefits

The majority of accrued severance benefits

are

Revenue Recognition

recognized as revenue during the year ended December 31, 2019 and $

4,428

Substantially all of the Company’s contracts are

one

year or less in duration. The standard payment terms with customers are generally

thirty

sixty

days from the time of shipment, product delivery to the customer’s location or customer acceptance, depending on the terms of the related arrangement.

Unbilled accounts receivable represents the Company’s contractual right to consideration for manufacturing work performed on a customer contract or an individual purchase order

that

has not been invoiced to the customer. As of December 31, 2019 and 2018, the Company recorded unbilled accounts receivable of $17,094, net of an allowance of $627 thousand, and $

38,181

1,769

thousand, $

1,861

thousand, and $

1,652

thousand for the years ended December 31, 2019, 2018 and 2017, respectively.

Derivative Financial Instruments

The cash flows from derivative instruments receiving hedge accounting treatment are classified in the same categories as the hedged items in the consolidated statements of cash flows.

Advertising

Product Warranties

Research and Development

Research and development expenses are expensed as incurred and include wafers, masks, employee expenses, contractor fees, building costs, utilities and administrative expenses.

Licensed Patents and Technologies

The Company has entered into a number of royalty agreements to license patents and technology used in the design of its products. The Company carries two types of royalties:

lump-sum

and running basis.

Lump-sum

royalties, which require initial payments, usually paid in installments, represent a

non-refundable

Running royalties are paid based on the revenue of related products sold by the Company.

Stock-Based Compensation

Earnings per Share

Earnings Per Share

if-converted

Income Taxes

The Company recognizes and measures uncertain tax positions taken or expected to be taken in a tax return utilizing a

two-step

process. In the first step, recognition, the Company determines whether it is

more-likely-than-not

criteria. The tax position is measured at the largest amount of benefit that has a likelihood of greater than 50 percent of being realized upon ultimate settlement.

Concentration of Credit Risk

Recent Accounting Pronouncements Not Yet Adopted

Recent Accounting Pronouncements

Not Yet Adopted

In December 2019, the FASB issued Accounting Standards Update No. ASU

2019-12,

“Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes” (“ASU

2019-12”).

ASU

2019-12

for

In June 2016, the FASB issued Accounting Standards Update

No. 2016-13,

“Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” (“ASU

2016-13”).

ASU

2016-13

No. 2019-04,

“Codification Improvements to Topic 326, Financial Instruments—Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments” (“ASU

2019-04”)

and

2016-13.

ASU

2016-13,

ASU

2019-04

and ASU

2019-11

are effective for fiscal years beginning after December 15, 2019, with early adoption permitted. The Company does not expect the adoption of ASU

2016-13,

ASU

2019-04

and

2019-11

to have a material effect on the Company’s consolidated financial statements.

In August 2018, the FASB issued Accounting Standards Update

No. 2018-13

“Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement” (“ASU

2018-13”).

ASU

2018-13

amends existing fair value measurement disclosure requirements by adding, changing, or removing certain disclosures. ASU

2018-13

Recently Adopted Accounting Pronouncements

In February 2018, the FASB issued Accounting Standards Update

No. 2018-02,

Reform

. The Company adopted ASU

2018-02

in the first quarter of 2019, and the adoption did not impact the Company’s consolidated financial statements and related disclosures.

In August 2017, the FASB issued Accounting Standards Update

No. 2017-12,

“Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities” (“ASU

2017-12”).

ASU

2017-12

in the first quarter of 2019, and the adoption of ASU

2017-12

did not have a material impact to the Company’s consolidated financial statements.

In July 2017, the FASB issued Accounting Standards Update

No. 2017-11,

“Earnings Per Share (Topic 260): Distinguishing Liabilities from Equity (Topic 480): Derivatives and Hedging (Topic 815)” (“ASU

2017-11”),

2017-11

in the first quarter of 2019, and the adoption did not impact the Company’s consolidated financial statements.

In February 2016, the FASB issued Accounting Standards Update

No. 2016-02,

“Leases (Topic 842)” (“ASU

2016-02”)

2016-02

requires that a lessee recognize a liability to make lease payments and a

right-of-use

asset representing its right to use the underlying asset for the lease term on the balance sheet. The FASB issued Accounting Standards Update No

2018-01,

“Leases (Topic 842) Land Easement Practical Expedient for Transition to Topic 842” (“ASU

2018-01”).

ASU

2018-01

permits an entity to elect an optional transition practical expedient not to evaluate land easements that exist or expired before the entity’s adoption of ASU

2016-02

and that were not accounted for as leases under previous lease guidance. In July 2018, the FASB issued Accounting Standards Update No

2018-10,

“Codification Improvements to Topic 842 Leases” (“ASU

2018-10”).

ASU

2018-10

provides narrow amendments to clarify how to apply certain aspects of the new lease standard. In July 2018, the FASB also issued Accounting Standards Update No

2018-11,

“Leases (Topic 842) Targeted Improvements” (“ASU

2018-11”).

ASU

2018-11

allows an entity to recognize a cumulative-effect adjustment to the opening balance of retained earnings upon adoption of ASU

2016-02

(the “modified retrospective transition method”). In December 2018, the FASB issued Accounting Standards Update No

2018-20,

“Leases (Topic 842) Narrow Scope Improvements for Lessors” (“ASU

2018-20”).

ASU

2018-20

provides certain amendments that affect narrow aspects of the guidance issued in ASU

2016-02.

In March 2019, the FASB issued Accounting Standards Update No

2019-01

“Codification Improvements” (“ASU

2019-01”).

The effective date and transition requirements for ASU

2016-02,

ASU

2018-01,

ASU

2018-10,

ASU

2018-11,

ASU

2018-20

and ASU

2019-01

are the same.

right-of-use

The Company used hindsight for determining a remaining lease term and assessing the likelihood of whether a renewal option is reasonably certain to be exercised by the Company.

In addition, the adoption did not materially impact the Company’s consolidated statements of operations or cash flows for the year ended December 31, 2019

. For further information regarding these impacts, see Note 7, “Leases.”

In May 2014, the FASB issued ASU

2014-09.

ASU

2014-09

2016-08,

which clarifies the implementation guidance on principal versus agent considerations. In April 2016, the FASB issued

ASU 2016-10,

which clarifies identifying performance obligations and the licensing implementation guidance. In May 2016, the FASB issued ASU

2016-12,

which improves certain aspects of ASC Topic 606 “Revenue from Contracts with Customers.” In December 2016, the FASB issued ASU

2016-20,

which improves certain aspects of ASC Topic 606 “Revenue from Contracts with Customers.” The effective date and transition requirements for ASU

2016-08,

ASU

2016-10,

ASU

2016-12

and ASU

2016-20

are the same as the effective date and transition requirements of ASU

2014-09

(collectively, the “new revenue standard”).

Equity Incentive Plans

12 Months Ended

Dec. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Equity Incentive Plans

13. Equity Incentive Plans

The Company adopted its 2009 Common Unit Plan, or the 2009 Plan, effective December 8, 2009, which is administered by the Compensation Committee of the Company’s Board of Directors (the “Compensation Committee”). The 2009 Plan terminated in connection with the Company’s initial public offering in March 2011, and no additional options or other equity awards may be granted under the 2009 Plan. However, options granted under the 2009 Plan prior to its termination will remain outstanding until they are either exercised or expired. The Company adopted its 2011 Equity Incentive Plan, or the 2011 Plan, in March 2010. The Company amended and restated the 2011 Plan in February 2011, and the Company’s stockholders approved the amendment in March 2011 to reflect that it became effective in 2011 in connection with the Company’s initial public offering in March 2011. The 2011 Plan was amended on October 23, 2017, to revise the clawback policy of the 2011 Plan. The 2011 Plan was amended on April 26, 2018 to amend the tax withholding provisions as they relate to directed sales of shares. Awards may be granted under the 2011 Plan to the Company’s employees, officers, directors, or consultants or those of any present or future parent or subsidiary corporation or other affiliated entity. While the Company may grant incentive stock options only to employees, the Company may grant nonstatutory stock options, stock appreciation rights, restricted stock purchase rights or bonuses, restricted stock units, performance shares, performance units and cash-based awards or other stock-based awards to any eligible participant, subject to terms and conditions determined by the Compensation Committee. The term of options shall not exceed ten years from the date of grant. Restricted stock purchase rights shall be exercisable within a period established by the Compensation Committee, which shall in no event exceed thirty days from the effective date of the grant. As of December 31, 2019 an aggregate maximum of 9,347 thousand shares were authorized and 987 thousand shares were reserved for all future grants.

Stock options and stock appreciation rights must have exercise prices at least equal to the fair market value of the stock at the time of their grant pursuant to the 2011 Plan. The requisite service period, or the period during which a grantee is required to provide service in exchange for option grants, coincides with the vesting period. Stock options typically vest over one to three years following grant.

Restricted stock units granted under the 2011 Plan represent a right to receive shares of the Company’s common stock when the restricted stock unit vests. No monetary payment (other than applicable tax withholding) shall be required as a condition of receiving shares pursuant to a restricted stock unit, the consideration for which shall be services actually rendered to a participating company or for its benefit. Stock issued pursuant to any restricted stock unit may (but need not) be made subject to vesting conditions based upon the satisfaction of such service requirements, conditions, restrictions or performance criteria as shall be established by the Compensation Committee and set forth in the award agreement evidencing such award. Restricted stock units typically vest over one to three years following grant.

The purchase price for shares issuable under each restricted stock purchase right shall be established by the Compensation Committee in its discretion. No monetary payment (other than applicable tax withholding) shall be required as a condition of receiving shares pursuant to a restricted stock bonus, the consideration for which shall be services actually rendered to a participating company or for its benefit. Stock issued pursuant to any restricted stock award may (but need not) be made subject to vesting conditions based upon the satisfaction of such service requirements, conditions, restrictions or performance criteria as shall be established by the Compensation Committee and set forth in the award agreement evidencing such award. During any period in which stock acquired pursuant to a restricted stock award remain subject to vesting conditions, such stock may not be sold, exchanged, transferred, pledged, assigned or otherwise disposed of other than pursuant to an ownership change event or transfer by will or the laws of descent and distribution. The grantee shall have all of the rights of a stockholder of the Company holding stock, including the right to vote such stock and to receive all dividends and other distributions paid with respect to such stock; provided, however, that if so determined by the Compensation Committee and provided by the award agreement, such dividends and distributions shall be subject to the same vesting conditions as the stock subject to the restricted stock award with respect to which such dividends or distributions were paid. If a grantee’s service terminates for any reason, whether voluntary or involuntary (including the grantee’s death or disability), then (a) the Company (or its assignee) has the option to repurchase for the purchase price paid by the grantee any stock acquired by the grantee pursuant to a restricted stock purchase right which remains subject to vesting conditions as of the date of the grantee’s termination of service and (b) the grantee shall forfeit to the Company any stock acquired by the grantee pursuant to a restricted stock bonus which remains subject to vesting conditions as of the date of the grantee’s termination of service. The Company has the right to assign at any time any repurchase right it may have, whether or not such right is then exercisable, to one or more persons as may be selected by the Company.

The following summarizes restricted stock unit activities for the years ended December 31, 2019, 2018 and 2017.


	Number of Restricted Stock Units			Weighted Average Grant-Date Fair Value of Restricted Stock Units
Outstanding at January 1, 2017		566,389		$	6.03
Granted		172,716			11.15
Vested		(368,555	)		5.72
Settled of previous year vesting		(28,967	)		8.00
Forfeited		(830	)		8.33

Outstanding at December 31, 2017		340,753		$	8.80

Granted		739,231			9.64
Vested		(373,620	)		9.24
Unsettled		45,311			9.22
Forfeited		(33,462	)		10.31

Outstanding at December 31, 2018		718,213		$	9.39

Granted		711,719			11.85
Vested		(528,740	)		11.00
Unsettled		226,215			12.16
Settled of previous year vesting		(42,189	)		9.22
Forfeited		(41,915	)		10.00

Outstanding at December 31, 2019		1,043,303		$	10.83

Total compensation expenses recorded for the restricted stock units were $6,939 thousand, $4,096 thousand and $1,601 thousand for the years ended December 31, 2019, 2018 and 2017, respectively. As of December 31, 2019, there was $4,289 thousand of total unrecognized compensation cost related to unvested restricted stock units, which is expected to be recognized over a weighted average future period of 0.5 year. Total fair value of restricted stock units vested were $5,817 thousand, $2,647 thousand and $2,107 thousand for the years ended December 31, 2019, 2018 and 2017, respectively.

The following summarizes stock option activities for the years ended December 31, 2019, 2018 and 2017. At the date of grant, all options had an exercise price not less than the fair value of common stock (aggregate intrinsic value in thousands):


	Number of Options			Weighted Average Exercise Price of Stock Options		Aggregate Intrinsic Value of Stock Options		Weighted Average Remaining Contractual Life of Stock Options
Outstanding at January 1, 2017		3,428,665		$	9.23	$	525		6.7 years
Granted		70,865			10.43		—		—
Forfeited		(88,443	)		12.77		—		—
Exercised		(539,183	)		6.94		1,540		—

Outstanding at December 31, 2017		2,871,904		$	9.59	$	6,073		6.2 years

Vested and expected to vest at December 31, 2017		2,865,475			9.59		6,050		6.2 years
Exercisable at December 31, 2017		2,395,979			10.11		4,603		5.7 years

Outstanding at January 1, 2018		2,871,904		$	9.59	$	6,073		6.2 years
Forfeited		(34,807	)		10.97		—		—
Exercised		(162,341	)		6.97		737		—

Outstanding at December 31, 2018		2,674,756		$	9.73	$	395		5.2 years

Vested and expected to vest at December 31, 2018		2,674,266			9.73		394		5.2 years
Exercisable at December 31, 2018		2,544,565			9.94		306		5.1 years

Outstanding at January 1, 2019		2,674,756		$	9.73	$	395		5.2 years
Forfeited		(44,892	)		10.29		—		—
Exercised		(452,819	)		6.31		2,404		—

Outstanding at December 31, 2019		2,177,045		$	10.42	$	6,259		4.7 years

Vested and Exercisable at December 31, 2019		2,177,045		$	10.42	$	6,259		4.7 years

Total compensation expenses recorded for the stock options were $13 thousand, $313 thousand and $734 thousand for the years ended December 31, 2019, 2018 and 2017, respectively. There was no unrecognized compensation cost related to stock options expected to vest as of December 31, 2019. Total weighted average grant-date fair value of vested options was $165 thousand, $786 thousand and $794 thousand for the years ended December 31, 2019, 2018 and 2017, respectively.

The Company utilizes the Black-Scholes option-pricing model to measure the fair value of each option grant. There were no grants of stock options during the years ended December 31, 2019 and 2018. The following summarizes the grant-date fair value of options granted for the year ended December 31, 2017 and assumptions used in the Black-Scholes option-pricing model on a weighted average basis. For the year ended December 31, 2017, the expected volatility was estimated using historical volatility of the Company’s share prices.


	Year Ended December 31,
	2019		2018		2017
Grant-date fair value of option		—		—	$	5.02
Expected term		—		—		2.5 Years
Risk-free interest rate		—		—		1.2	%
Expected volatility		—		—		81.7	%
Expected dividends		—		—		—

The number and weighted average grant-date fair value of the unvested stock options are as follows:


	Year Ended December 31,
	2019					2018					2017
	Number			Weighted Average Grant- Date Fair Value		Number			Weighted Average Grant- Date Fair Value		Number			Weighted Average Grant- Date Fair Value
Unvested options at the beginning of the period		130,191		$	1.54		475,925		$	2.19		897,421		$	1.72
Granted options during the period		—			—		—			—		70,865			5.02
Vested options during the period		(107,100	)		1.54		(313,160	)		2.51		(455,301	)		1.74
Forfeited options during the period		(345	)		1.54		(14,738	)		1.73		(19,031	)		1.77
Exercised options during the period		(22,746	)		1.54		(17,836	)		1.66		(18,029	)		1.59

Unvested options at the end of the period		0			—		130,191		$	1.54		475,925		$	2.19

Derivative Financial Instruments - Details of Derivative Contracts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Zero Cost Collar One [Member]
Derivative [Line Items]
Date of transaction	Aug. 13, 2019	Jun. 27, 2018
Type of derivative	Zero cost collar	Zero cost collar
Total notional amount	$ 60,000	$ 18,000
Month of settlement, start	2020-01	2019-01
Month of settlement, end	2020-06	2019-06
Zero Cost Collar Two [Member]
Derivative [Line Items]
Date of transaction	Sep. 27, 2019
Type of derivative	Zero cost collar
Total notional amount	$ 42,000
Month of settlement, start	2020-01
Month of settlement, end	2020-06
Zero Cost Collar Three [Member]
Derivative [Line Items]
Date of transaction	Dec. 04, 2019
Type of derivative	Zero cost collar
Total notional amount	$ 30,000
Month of settlement, start	2020-07
Month of settlement, end	2020-12
Forward [Member]
Derivative [Line Items]
Date of transaction		Jun. 27, 2018
Type of derivative		Forward
Total notional amount		$ 36,000
Month of settlement, start		2019-01
Month of settlement, end		2019-06

Income Taxes - Components of Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income (loss) before income tax expenses
Domestic	$ (27,758)	$ 3,492	$ 27,461
Foreign	10,679	(2,743)	58,630
Income (loss) before income tax expense	(17,079)	749	86,091
Current income tax expense (benefit)
Domestic	20	(383)	(359)
Foreign	4,679	5,010	3,680
Current income taxes expense	12	(48)	(2,111)
Uncertain tax position liability (foreign)	4,711	4,579	1,210
Deferred income taxes expense (benefit)
Foreign	36	70	(55)
Total income tax expenses	4,747	$ 4,649	$ 1,155
Effective tax rate		620.60%	1.30%
Domestic [Member]
Current income tax expense (benefit)
Current income taxes expense	(1)	$ (2)	$ (476)
Foreign [Member]
Current income tax expense (benefit)
Current income taxes expense	$ 13	$ (46)	$ (1,635)

Unaudited Quarterly Financial Result - Schedule of Selected Consolidated Statements of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 199,993	$ 229,677	$ 205,145	$ 157,380	$ 179,394	$ 206,000	$ 199,685	$ 165,819	$ 792,195	$ 750,898	$ 679,672
Gross profit	53,204	60,866	43,840	22,701	43,912	55,749	53,854	44,581	180,611	198,096	187,893
Operating income	10,035	25,923	6,746	(18,281)	7,860	18,265	13,914	7,379	24,423	47,418	39,236
Net loss	$ 23,426	$ (1,607)	$ (9,520)	$ (34,125)	$ (2,380)	$ 17,222	$ (21,505)	$ 2,763	$ (21,826)	$ (3,900)	$ 84,936
Earnings (loss) per share:
Basic	$ 0.68	$ (0.05)	$ (0.28)	$ (1.00)	$ (0.07)	$ 0.50	$ (0.62)	$ 0.08	$ (0.64)	$ (0.11)	$ 2.50
Diluted	$ 0.54	$ (0.05)	$ (0.28)	$ (1.00)	$ (0.07)	$ 0.41	$ (0.62)	$ 0.08	$ (0.64)	$ (0.11)	$ 2.02
Weighted average common stock outstanding:
Basic	34,542,415	34,357,745	34,245,127	34,194,878	34,627,292	34,573,377	34,420,654	34,253,111	34,321,888	34,469,921	33,943,264
Diluted	46,078,768	34,357,745	34,245,127	34,194,878	34,627,292	46,021,610	34,420,654	35,154,693	34,321,888	34,469,921	44,755,137

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	43,851,991	43,054,458
Common stock, shares outstanding	34,800,312	34,441,232
Treasury stock, shares	9,051,679	8,613,226

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities
Net income (loss)	$ (21,826)	$ (3,900)	$ 84,936
Adjustments to reconcile net loss to net cash provided by (used in) operating activities
Depreciation and amortization	32,729	32,048	28,146
Provision for severance benefits	17,139	17,644	24,373
Amortization of debt issuance costs and original issue discount	2,299	2,183	1,987
Loss (gain) on foreign currency, net	24,692	30,215	(77,600)
Restructuring and other charges (gains)	3,598		(17,010)
Stock-based compensation	6,952	4,409	2,336
Loss on early extinguishment of long-term borrowings, net	42	206
Other	247	(1,235)	49
Changes in operating assets and liabilities
Accounts receivable, net	(19,824)	8,294	(22,210)
Unbilled accounts receivable, net	19,274	(1,284)
Inventories, net	(4,210)	(30,675)	(8,077)
Other receivables	(6,200)	1,260	2,218
Other current assets	11,984	9,942	2,318
Accounts payable	7,375	(8,389)	10,320
Other accounts payable	(8,518)	(11,183)	(12,141)
Accrued expenses	5,279	(3,926)	(12,020)
Deferred revenue	(4,768)	2,891	(3,949)
Other current liabilities	(4,460)	2,123	(1,281)
Other non-current liabilities	(306)	2,346	(760)
Payment of severance benefits	(9,288)	(11,688)	(21,506)
Other	(1,713)	(2,045)	(382)
Net cash provided by (used in) operating activities	50,497	39,236	(20,253)
Cash flows from investing activities
Proceeds from settlement of hedge collateral	13,583	14,342	10,615
Payment of hedge collateral	(17,833)	(12,907)	(14,839)
Proceeds from disposal of property, plant and equipment	202	1,685	1,209
Purchase of property, plant and equipment	(22,955)	(28,948)	(32,661)
Payment for property related to water treatment facility arrangement (Note 4)		(4,283)
Payment for intellectual property registration	(1,103)	(961)	(1,207)
Collection of guarantee deposits	549	801	1,462
Payment of guarantee deposits	(1,349)	(3,016)	(41)
Other	9	(19)	94
Net cash used in investing activities	(28,897)	(33,306)	(35,368)
Cash flows from financing activities
Proceeds from issuance of senior notes			86,250
Payment of debt issuance costs			(5,902)
Repurchase of long-term borrowings	(1,175)	(2,228)
Proceeds from exercise of stock options	2,860	1,132	3,744
Acquisition of treasury stock	(2,702)	(1,607)	(11,401)
Proceeds from property related to water treatment facility arrangement (Note 5)		4,283
Repayment of financing related to water treatment facility arrangement (Note 5)	(552)	(286)
Repayment of principal portion of finance lease liabilities	(233)
Net cash provided by (used in) financing activities	(1,802)	1,294	72,691
Effect of exchange rates on cash, cash equivalents and restricted cash	(579)	(3,361)	9,899
Net increase in cash, cash equivalents and restricted cash	19,219	3,863	26,969
Cash, cash equivalents and restricted cash
Beginning of the period	132,438	128,575	101,606
End of the period	151,657	132,438	128,575
Supplemental cash flow information
Cash paid for interest	19,071	19,255	17,590
Cash paid for income taxes	2,081	920	1,027
Non-cash investing and financing activities
Property, plant and equipment additions in other accounts payable	2,542	$ 5,249	$ 2,520
Acquisition of treasury stock to satisfy the tax withholding obligations in connection with equity-based compensation	$ (405)

Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2019

Payables and Accruals [Abstract]

Summary of Accrued Expenses

Accrued expenses as of December 31, 2019 and 2018 are comprised of the following (in thousands):


	December 31,
	2019		2018
Payroll, benefits and related taxes, excluding severance benefits	$	16,505	$	14,548
Withholding tax attributable to intercompany interest income		23,371		20,879
Interest on senior notes		8,205		8,226
Outside service fees		898		935
Restructuring and others		3,549		—
Others		2,548		1,662

Accrued expenses	$	55,076	$	46,250

Geographic and Segment Information

12 Months Ended

Dec. 31, 2019

Segment Reporting [Abstract]

Geographic and Segment Information

18. Geographic and Segment Information

The Company has two operating segments: its Foundry Services Group and Standard Products Group. The Company’s chief operating decision maker is its Chief Executive Officer, who allocates resources and assesses performance of the business and other activities based on gross profit.

In January 2018, as part of the Company’s ongoing portfolio optimization effort to realign business processes and streamline the Company’s organizational structure, the Company transferred a portion of its

non-OLED

Display business from its Standard Products Group to its Foundry Services Group. The transferred

non-OLED

Display business has technical and business characteristics more closely aligned with the Company’s Foundry Services Group business than with the Company’s Standard Products Group business. The transferred

non-OLED

Display business previously resided within the Company’s Display Solutions business line primarily as a result of a long standing customer relationship established in the past. The Company has recast comparative segment financial information to conform to this current period change. For the year ended December 31, 2017, $30,306 thousand of net sales and $6,322 thousand of gross profit were reclassified from the Display Solutions business line in the Standard Products Group to the Foundry Services Group.

The following sets forth information relating to the operating segments (in thousands):


	Year Ended December 31,
	2019		2018		2017 As Adjusted
Net Sales
Foundry Services Group	$	307,144	$	325,312	$	350,395
Standard Products Group
Display Solutions		308,531		256,113		179,233
Power Solutions		176,245		169,284		149,836

Total Standard Products Group		484,776		425,397		329,069
All other		275		189		208

Total net sales	$	792,195	$	750,898	$	679,672


	Year Ended December 31,
	2019		2018		2017 As Adjusted
Gross Profit
Foundry Services Group	$	64,010	$	82,578	$	101,780
Standard Products Group		116,327		115,478		85,905
All other		274		40		208

Total gross profit	$	180,611	$	198,096	$	187,893

Upon the adoption of the new revenue standard, the Company’s revenue for Foundry Services Group is disaggregated depending on the timing of revenue recognition (in thousands):


	Year Ended December 31, 2019
	Revenue recognized at the time of shipment or delivery		Revenue recognized over time		Total
Net Sales
Foundry Services Group	$	157,272	$	149,872	$	307,144

	Year Ended December 31, 2018
	Revenue recognized at the time of shipment or delivery		Revenue recognized over time		Total
Net Sales
Foundry Services Group	$	80,578	$	244,734	$	325,312

The following is a summary of net sales by geographic region, based on the location to which the products are billed (in thousands):


	Year Ended December 31,
	2019		2018		2017
Korea	$	249,385	$	282,516	$	279,883
Asia Pacific (other than Korea)		466,380		380,598		322,595
United States		28,109		37,483		35,089
Europe		46,421		47,831		41,109
Others		1,900		2,470		996

Total	$	792,195	$	750,898	$	679,672

For the years ended December 31, 2019, 2018 and 2017, the Company’s net sales in Greater China (China, Hong Kong and Macau) represented 75.4%, 66.6% and 49.7%, respectively, and net sales in Taiwan represented 20.9%, 26.2% and 36.4%, respectively, of the Company’s net sales in the Asia Pacific (other than Korea).

Net sales from the Company’s top ten largest customers accounted for 67%, 61% and 57% for the years ended December 31, 2019, 2018 and 2017, respectively.

For the year ended December 31, 2019, the Company had one customer that represented 32.9% of its net sales. For the year ended December 31, 2018, the Company had two customers that represented 19.3% and 13.3% of its net sales. For the year ended December 31, 2017, the Company had one customer that represented 15.6% of its net sales.

98% of the Company’s property, plant and equipment are located in Korea as of December 31, 2019.

Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2019

Schedule of Accounts Receivable

Accounts receivable as of December 31, 2019 and 2018 consisted of the following (in thousands):


	December 31,
	2019			2018
Accounts receivable	$	92,685		$	80,155
Notes receivable		3,706			856
Less:
Allowances for doubtful accounts		(87	)		(90	)
Sales return reserves		(387	)		(439	)
Volume discounts		(276	)		(479	)

Accounts receivable, net	$	95,641		$	80,003

Allowance for Doubtful Accounts [Member]

Schedule of Changes in Receivables and Reserves

Changes in allowance for doubtful accounts for the years ended December 31, 2019, 2018 and 2017 are as follows (in thousands):


	Year Ended December 31,
	2019			2018			2017
Beginning balance	$	(90	)	$	(94	)	$	(83	)
Translation adjustments		3			4			(11	)

Ending balance	$	(87	)	$	(90	)	$	(94	)

Sales Return Reserve [Member]

Schedule of Changes in Receivables and Reserves

Changes in sales return reserves for the years ended December 31, 2019, 2018 and 2017 are as follows (in thousands):


	Year Ended December 31,
	2019			2018			2017
Beginning balance	$	(439	)	$	(628	)	$	(1,107	)
Provision		(136	)		(245	)		(40	)
Usage		170			414			626
Translation adjustments		18			20			(107	)

Ending balance	$	(387	)	$	(439	)	$	(628	)

Low Yield Compensation Reserve [Member]

Schedule of Changes in Receivables and Reserves

Changes in low yield compensation reserve for the year ended December 31, 2017 are as follows (in thousands):


	Year Ended December 31, 2017
Beginning balance	$	(432	)
Provision		(362	)
Usage		22
Translation adjustments		(72	)

Ending balance	$	(844	)

Beginning in the first quarter of 2018, the Company recognized the low yield compensation reserves as a component of cost of sales, which were previously recorded as a deduction of sales.

Discounts On Accounts and Notes Receivables [Member]

Schedule of Changes in Receivables and Reserves

Changes in volume discounts for the years ended December 31, 2019 and 2018 are as follows (in thousands):


	Year Ended December 31,
	2019			2018
Beginning balance	$	(479	)	$	—
Provision		(1,852	)		(1,378	)
Usage		2,040			892
Translation adjustments		15			7

Ending balance	$	(276	)	$	(479	)

Product Warranties

12 Months Ended

Dec. 31, 2019

Guarantees and Product Warranties [Abstract]

Product Warranties

10. Product Warranties

Changes in accrued warranty liabilities for the years ended December 31, 2019, 2018 and 2017 are as follows (in thousands):


	Year Ended December 31,
	2019			2018			2017
Beginning balance	$	610		$	1,060		$	466
Change in provision (reversal)		2,357			222			(224	)
Usage		(1,315	)		(636	)		(65	)
Translation adjustments		(6	)		(36	)		39

Ending balance	$	1,646		$	610		$	216

Beginning in the first quarter of 2018, the Company recognized low yield compensation reserves as a component of cost of sales. Low yield compensation reserves were previously recorded as a deduction of sales.

The Company accounted for this change prospectively as a change in accounting estimate, which resulted in an increase of $844 thousand in current liabilities, as of January 1, 2018.

Commitments and Contingencies

12 Months Ended

Dec. 31, 2019

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

19. Commitments and Contingencies

Operating Agreements with SK

ynix

In connection with the acquisition of the

non-memory

semiconductor business from SK

ynix on October 4, 2004 (the “Original Acquisition”), the Company entered into several agreements with SK

ynix, including a

non-exclusive

cross license that provides the Company with access to certain of SK

ynix’s intellectual property for use in the manufacture and sale of

non-memory

semiconductor products. The Company also agreed to provide certain utilities and infrastructure support services to SK

ynix.

Upon the closing of the Original Acquisition, the Company’s Korean subsidiary and SK

ynix also entered into lease agreements under which the Company’s Korean subsidiary leases space to SK

ynix in several buildings, primarily warehouses and utility facilities, in Cheongju, Korea. These leases are generally for an initial term of 20 years plus an indefinite number of renewal terms of 10 years each. Each of the leases is cancelable upon 90 days’ notice by the lessee. The Company also leases certain land from SK

ynix located in Cheongju, Korea. The term of this lease is indefinite unless otherwise agreed by the parties, and as long as the buildings remain on the lease site and are owned and used by the Company for permitted uses.

Long-term Purchase Agreements

The Company purchases raw materials from a variety of vendors. During the normal course of business, in order to manage manufacturing lead times and help assure adequate supply, the Company from time to time may enter into multi-year purchase agreements, which specify future quantities and pricing of materials to be supplied by the vendors. The Company reviews the terms of the long-term supply agreements and assesses the need for any accrual for estimated losses, such as lower of cost or net realizable value that will not be recovered by future sales prices. No such accrual was required as of December 31, 2019 or 2018.

SEC Enforcement Staff Review

In March 2014, the Company voluntarily reported to the Securities and Exchange Commission, or the SEC, that the Company’s Audit Committee had determined that the Company incorrectly recognized revenue on certain transactions and as a result would restate its financial statements, and that the Audit Committee had commenced an independent investigation. Over the course of 2014 and the first two quarters of 2015, the Company voluntarily produced documents to the SEC regarding the various accounting issues identified during the independent investigation, and whether the Company’s hiring of an accountant from the Company’s independent registered public accounting firm impacted that accounting firm’s independence. On July 22, 2014, the Staff of the SEC’s Division of Enforcement obtained a Formal Order of Investigation. On March 12, 2015, the SEC issued a subpoena for documents to the Company in connection with its investigation. On May 1, 2017, the SEC announced that it had reached a final settlement with the Company, resolving the SEC’s investigation. In that connection, the Company has consented, without admitting or denying the SEC’s findings, to the entry of an administrative order by the SEC directing that the Company cease and desist from committing or causing any violations of certain provisions of the federal securities laws and related SEC regulations. The SEC’s administrative order was entered on May 1, 2017. The SEC imposed a monetary penalty of $3,000 thousand on the Company. In the first quarter ended March 31, 2017, the Company established a reserve in that amount for the potential settlement of this matter. The reserved monetary penalty of $3,000 thousand was paid to the SEC during the second quarter of 2017. The Company also agreed to an undertaking to cooperate fully with the SEC in any and all investigations, litigations or other proceedings relating to or arising from the matters described in the SEC’s order. In connection with the settlement, the SEC considered remedial acts promptly undertaken by the Company and its cooperation with the SEC staff during the course of the investigation. Among other things, as previously disclosed in the Company’s filings with the SEC, the Audit Committee of the Company self-investigated and self-reported the accounting errors, selected new management and implemented various additional controls designed to prevent similar errors going forward.

Derivative Financial Instruments

12 Months Ended

Dec. 31, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

9. Derivative Financial Instruments

The Company’s Korean subsidiary from time to time has entered into zero cost collar and forward contracts to hedge the risk of changes in the functional-currency-equivalent cash flows attributable to currency rate changes on US dollar denominated revenues.

Details of derivative contracts as of December 31, 2019 are as follows (in thousands):


Date of transaction	Type of derivative	Total notional amount		Month of settlement
August 13, 2019	Zero cost collar	$	60,000	January 2020 to June 2020
September 27, 2019	Zero cost collar	$	42,000	January 2020 to June 2020
December 4, 2019	Zero cost collar	$	30,000	July 2020 to December 2020

Details of derivative contracts as of December 31, 2018 are as follows (in thousands):


Date of transaction	Type of derivative	Total notional amount		Month of settlement
June 27, 2018	Zero cost collar	$	18,000	January 2019 to June 2019
June 27, 2018	Forward	$	36,000	January 2019 to June 2019

The zero cost collar and forward contracts qualify as cash flow hedges under ASC 815, “Derivatives and Hedging,” since at both the inception of the contracts and on an ongoing basis, the hedging relationship was and is expected to be highly effective in achieving offsetting cash flows attributable to the hedged risk during the term of the contracts.

The fair values of the Company’s outstanding zero cost collar and forward contracts recorded as assets and liabilities as of December 31, 2019 and 2018 are as follows (in thousands):


Derivatives designated as hedging instruments:		December 31,
Derivatives designated as hedging instruments:		2019		2018
Asset Derivatives:
Zero cost collars	Other current assets	$	1,456	$	—
Liability Derivatives:
Zero cost collars	Other current liabilities	$	—	$	117
Forward	Other current liabilities	$	—	$	607

Offsetting of derivative assets as of December 31, 2019 is as follows (in thousands):


As of December 31, 2019	Gross amounts of recognized assets		Gross amounts offset in the balance sheets		Net amounts of assets presented in the balance sheets		Gross amounts not offset in the balance sheets				Net amount
As of December 31, 2019	Gross amounts of recognized assets		Gross amounts offset in the balance sheets		Net amounts of assets presented in the balance sheets		Financial instruments		Cash collateral pledged		Net amount
Asset Derivatives:
Zero cost collars	$	1,456	$	—	$	1,456	$	—	$	1,070	$	2,526

Offsetting of derivative liabilities as of December 31, 2018 is as follows (in thousands):


As of December 31, 2018	Gross amounts of recognized liabilities		Gross amounts offset in the balance sheets		Net amounts of liabilities presented in the balance sheets		Gross amounts not offset in the balance sheets					Net amount
As of December 31, 2018	Gross amounts of recognized liabilities		Gross amounts offset in the balance sheets		Net amounts of liabilities presented in the balance sheets		Financial instruments		Cash collateral pledged			Net amount
Liability Derivatives:
Zero cost collars	$	117	$	—	$	117	$	—	$	(360	)	$	(243	)
Forward	$	607	$	—	$	607	$	—	$	(1,450	)	$	(843	)

For derivative instruments that are designated and qualify as cash flow hedges, gains or losses on the derivative aside from components excluded from the assessment of effectiveness are reported as a component of accumulated other comprehensive income (“AOCI”) and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. Gains and losses on the derivative, representing hedge components excluded from the assessment of effectiveness, are recognized in current earnings.

The following table summarizes the impact of derivative instruments on the consolidated statements of operations for the years ended December 31, 2019 and 2018 (in thousands):


Derivatives in ASC 815 Cash Flow Hedging Relationships	Amount of Loss Recognized in AOCI on Derivatives (Effective Portion)						Location/Amount of Gain (Loss) Reclassified from AOCI Into Statement of Operations (Effective Portion)							Location/Amount of Loss Recognized in Statement of Operations on Derivatives (Ineffective Portion)(1)
Derivatives in ASC 815 Cash Flow Hedging Relationships	2019			2018					2019			2018				2019			2018
Zero cost collars	$	(1,096	)	$	(747	)		Net sales	$	(2,738	)	$	2,103		Other income, net	$	(193	)	$	(276	)
Forwards	$	(1,798	)	$	(842	)		Net sales	$	(1,750	)	$	1,656		Other income, net	$	(125	)	$	(190	)
Forwards—excluded time value(1)															Other income, net	$	—		$	(1,904	)

	$	(2,894	)	$	(1,589	)			$	(4,488	)	$	3,759			$	(318	)	$	(2,370	)

(1)

The FASB issued the new guidance about hedging activities (ASU

2017-12),

As of December 31, 2019, the amount expected to be reclassified from accumulated other comprehensive loss into income within the next twelve months is $1,545 thousand.

The Company set aside $8,750 thousand and $4,000 thousand of cash deposits to the counterparties, Nomura Financial Investment (Korea) Co., Ltd. (“NFIK”) and Deutsche Bank AG, Seoul Branch (“DB”), as required for the zero cost collar and forward contracts outstanding as of December 31, 2019 and 2018, respectively. These cash deposits are recorded as hedge collateral on the consolidated balance sheets.

The Company is required to deposit additional cash collateral with NFIK and DB for any exposure in excess of $500 thousand, and $1,070 thousand and $1,810 thousand of additional cash collateral were required and recorded as hedge collateral on the consolidated balance sheets as of December 31, 2019 and December 31, 2018, respectively.

These forward and zero cost collar contracts may be terminated by the counterparty in a number of circumstances, including if the Company’s long-term debt rating falls below

B-/B3

or if the Company’s total cash and cash equivalents is less than $30,000 thousand at the end of a fiscal quarter, unless a waiver is obtained from the counterparty.

Early Termination Charges

12 Months Ended

Dec. 31, 2019

Restructuring and Related Activities [Abstract]

Early Termination Charges

15. Early Termination Charges

As of February 22, 2017, the Company’s Board of Directors approved the implementation of a new headcount reduction plan (the “Headcount Reduction Plan”). As of June 30, 2017, 352 employees elected to resign from the Company during the period in which the Headcount Reduction Plan was offered. The total cash cost of approximately $31 million has been fully paid. The Company recorded in its consolidated statement of operations $13,369 thousand in termination related charges as early termination charges for the year ended December 31, 2017. The remaining total estimated cost relates to statutory severance benefits, which are required by law and ha

already been fully accrued in the Company’s consolidated financial statements.

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Net sales	$ 792,195	$ 750,898	$ 679,672
Cost of sales	611,584	552,802	491,779
Gross profit	180,611	198,096	187,893
Operating expenses
Selling, general and administrative expenses	71,637	72,639	81,775
Research and development expenses	75,356	78,039	70,523
Restructuring and other charges (gains)	9,195		(17,010)
Early termination charges			13,369
Total operating expenses	156,188	150,678	148,657
Operating income	24,423	47,418	39,236
Interest expense	(22,627)	(22,282)	(21,559)
Foreign currency gain (loss), net	(21,813)	(24,445)	65,516
Loss on early extinguishment of long-term borrowings, net	(42)	(206)
Other income, net	2,980	264	2,898
Income (loss) before income tax expense	(17,079)	749	86,091
Income tax expense	4,747	4,649	1,155
Net income (loss)	$ (21,826)	$ (3,900)	$ 84,936
Earnings (loss) per common share—
Basic	$ (0.64)	$ (0.11)	$ 2.50
Diluted	$ (0.64)	$ (0.11)	$ 2.02
Weighted average number of shares—
Basic	34,321,888	34,469,921	33,943,264
Diluted	34,321,888	34,469,921	44,755,137

Accounts Receivable - Schedule of Changes in Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Beginning balance	$ (90)	$ (94)	$ (83)
Translation adjustments	3	4	(11)
Ending balance	$ (87)	$ (90)	$ (94)

Earnings (Loss) per Share - Schedule of Antidilutive Securities Excluded from the Computation of Loss Per Common Share (Detail) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding units and warrants excluded from computation of diluted loss per share/unit	10,153,620	10,438,187
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding units and warrants excluded from computation of diluted loss per share/unit	2,177,045	2,674,756	835,572
Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding units and warrants excluded from computation of diluted loss per share/unit	1,043,303	718,213

Accrued Expenses - Summary of Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Payroll, benefits and related taxes, excluding severance benefits	$ 16,505	$ 14,548
Withholding tax attributable to intercompany interest income	23,371	20,879
Interest on senior notes	8,205	8,226
Outside service fees	898	935
Restructuring and others	3,549
Others	2,548	1,662
Accrued expenses	$ 55,076	$ 46,250

Leases - Supplemental Balance Sheet (Detail) $ in Thousands	Dec. 31, 2019 USD ($)
Assets
Operating lease	$ 11,482
Total leased assets	13,633
Current
Operating	2,036
Non-current
Operating	9,446
Total lease liabilities	13,705
Operating Lease Right Of Use Assets [Member]
Assets
Operating lease	11,482
Property, Plant and Equipment, Net [Member]
Assets
Finance lease	2,151
Current Operating Lease Liabilities [Member]
Current
Operating	2,036
Other Current Liabilities [Member]
Current
Finance	252
Non Current Operating Lease Liabilities [Member]
Non-current
Operating	9,446
Other Noncurrent Liabilities [Member]
Non-current
Finance	$ 1,971

Accrued Severance Benefits

12 Months Ended

Dec. 31, 2019

Postemployment Benefits [Abstract]

Accrued Severance Benefits

12. Accrued Severance Benefits

The majority of accrued severance benefits are for employees in the Company’s Korean subsidiary. Pursuant to the Employee Retirement Benefit Security Act of Korea, eligible employees and executive officers with one or more years of service are entitled to severance benefits upon the termination of their employment based on their length of service and rate of pay. As of December 31, 2019, 98% of all employees of the Company were eligible for severance benefits.

Changes in accrued severance benefits are as follows (in thousands):


	Year Ended December 31,
	2019			2018
Beginning balance	$	149,408		$	149,796
Provisions		17,139			17,644
Severance payments		(9,288	)		(11,688	)
Translation adjustments		(4,967	)		(6,344	)

		152,292			149,408
Less: Cumulative contributions to severance insurance deposit accounts		(4,781	)		(2,549	)
The National Pension Fund		(215	)		(230	)
Group severance insurance plan		(568	)		(598	)

Accrued severance benefits, net	$	146,728		$	146,031

The severance benefits funded through the Company’s National Pension Fund and group severance insurance plan will be used exclusively for payment of severance benefits to eligible employees. These amounts have been deducted from the accrued severance benefit balance.

Beginning in July 2018, the Company contribute

s to certain severance insurance deposit accounts

a certain percentage of severance benefits

that are

accrued for eligible employees for their services from January 1, 2018. These accounts consist of time deposits and other guaranteed principal and interest, and are maintained at insurance companies, banks or security companies for the benefit of employees. The Company deducts the contributions made to these severance insurance deposit accounts from its accrued severance benefits.

The Company is liable to pay the following future benefits to its

non-executive

employees upon their normal retirement age (in thousands):


	Severance Benefit
2020	$	1,066
2021		1,546
2022		1,349
2023		1,776
2024		2,630
2025 – 2029		35,442

The above amounts were determined based on the

non-executive

employees’ current salary rates and the number of service years that will be accumulated upon their retirement dates. These amounts do not include amounts that might be paid to

non-executive

employees that will cease working with the Company before their normal retirement ages.

Korea’s mandatory retirement age is 60 under the Employment Promotion for the Aged Act.

Accounts Receivable - Schedule of Changes in Low Yield Compensation Reserve (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
Receivables [Abstract]
Beginning balance	$ (432)
Provision	(362)
Usage	22
Translation adjustments	(72)
Ending balance	$ (844)

Earnings (Loss) per Share

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Earnings (Loss) per Share

21. Earnings (Loss) Per Share

The following table illustrates the computation of basic and diluted earnings (loss) per common share:


	Year Ended December 31,
	2019			2018			2017
	(In thousands of US dollars, except share data)
Basic earnings (loss) per share
Net income (loss)	$	(21,826	)	$	(3,900	)	$	84,936

Basic weighted average common stock outstanding		34,321,888			34,469,921			33,943,264
Basic earnings (loss) per share	$	(0.64	)	$	(0.11	)	$	2.50
Diluted earnings (loss) per share
Net income (loss)	$	(21,826	)	$	(3,900	)	$	84,936
Add back: Interest expense on Exchangeable Notes		—			—			5,349
Net income (loss) allocated to common stockholders	$	(21,826	)	$	(3,900	)	$	90,285

Basic weighted average common stock outstanding		34,321,888			34,469,921			33,943,264
Net effect of dilutive equity awards		—			—			821,664
Net effect of assumed conversion of 5.0% Exchangeable Notes to common stock		—			—			9,990,209

Diluted weighted average common stock outstanding		34,321,888			34,469,921			44,755,137
Diluted earnings (loss) per share	$	(0.64	)	$	(0.11	)	$	2.02

The following outstanding instruments were excluded from the computation of diluted loss per share, as they would have an anti-dilutive effect on the calculation:


	Year Ended December 31,
	2019		2018		2017
Options		2,177,045		2,674,756		835,572
Restricted Stock Units		1,043,303		718,213		—

For the years ended December 31, 2019 and 2018, respectively, 10,153,620 shares and 10,438,187 shares of potential common stock from the assumed conversion of Exchangeable Notes were excluded from the computation of diluted loss per share as the effect were anti-dilutive for the period.

Fair Value Measurements

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements

2. Fair Value Measurements

ASC 820 defines fair value, establishes a consistent framework for measuring fair value and expands disclosure requirements about fair value measurements. ASC 820 requires, among other things, the Company’s valuation techniques used to measure fair value to maximize the use of observable inputs and minimize the use of unobservable inputs.

Fair Value of Financial Instruments

As of December 31, 2019, the following table represents the Company’s assets measured at fair value on a recurring basis and the basis for that measurement (in thousands):


	Carrying Value December 31, 2019		Fair Value Measurement December 31, 2019		Quoted Prices in Active Markets for Identical Asset (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Derivative assets (other current assets)	$	1,456	$	1,456		—	$	1,456		—

As of December 31, 2018, the following table represents the Company’s liabilities measured at fair value on a recurring basis and the basis for that measurement (in thousands):


	Carrying Value December 31, 2018		Fair Value Measurement December 31, 2018		Quoted Prices in Active Markets for Identical Asset (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Liabilities:
Derivative liabilities (other current liabilities)	$	724	$	724		—	$	724		—

Items not reflected in the table above include cash equivalents, accounts receivable, other receivables, accounts payable, and other accounts payable, fair value of which approximate carrying values due to the short-term nature of these instruments. The fair value of assets and liabilities whose carrying value approximates fair value is determined using Level 2 inputs.

Fair Value of Long-Term Borrowings


	December 31, 2019				December 31, 2018
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(In thousands of US dollars)
Long-Term Borrowings:
5.0 % Exchangeable Senior Notes due March 2021 (Level 2)	$	81,959	$	116,078	$	81,418	$	86,835
6.625 % S enior N otes due July 2021 (Level 2)	$	222,784	$	224,250	$	222,159	$	202,046

On January 17, 2017, the Company’s wholly-owned subsidiary, MagnaChip Semiconductor S.A., closed an offering (the “Exchangeable Notes Offering”) of 5.0% Exchangeable Senior Notes due

March 1, 2021

(the “Exchangeable Notes”), of $86,250 thousand, which represents the principal amount, excluding $5,902 thousand of debt issuance costs. In December 2018 and February 2019, MagnaChip Semiconductor S.A. repurchased a principal amount equal to $1,590 thousand and $

920

thousand, respectively, of the Exchangeable Notes in the open market. The Company estimates the fair value of the Exchangeable Notes using the market approach, which utilizes quoted market prices that fall under Level 2. For further description of the Exchangeable Notes, see Note 11, “Long-Term Borrowings.”

On July 18, 2013, the Company issued 6.625%

enior

otes due

July 15, 2021

(the “2021 Notes”) of $225,000 thousand, which represents the principal amount, excluding $1,125 thousand of original issue discount and $5,039 thousand of debt issuance costs. In December 2018 and January 2019, the Company repurchased a principal amount equal to $500 thousand and $

250

thousand, respectively, of the 2021 Notes in the open market. The Company estimates the fair value of the 2021 Notes using the market approach, which utilizes quoted market prices that fall under Level 2. For further description of the 2021 Notes, see Note 11, “Long-Term Borrowings.”

Fair Values Measured on a

Non-recurring

Basis

The Company’s

non-financial

assets, such as property, plant and equipment, and intangible assets are recorded at fair value upon acquisition and are remeasured at fair value only if an impairment charge is recognized.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Geographic and Segment Information - Net Sales by Region, Based on Location of Products are Billed (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales	$ 199,993	$ 229,677	$ 205,145	$ 157,380	$ 179,394	$ 206,000	$ 199,685	$ 165,819	$ 792,195	$ 750,898	$ 679,672
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales									249,385	282,516	279,883
Asia Pacific (Other Than Korea) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales									466,380	380,598	322,595
U.S.A. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales									28,109	37,483	35,089
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales									46,421	47,831	41,109
Others [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales									$ 1,900	$ 2,470	$ 996

Inventories

12 Months Ended

Dec. 31, 2019

Inventory Disclosure [Abstract]

Inventories

4. Inventories

Inventories as of December 31, 2019 and 2018 consist of the following (in thousands):


	Year Ended December 31,
	2019			2018
Finished goods		17,489			14,334
Semi-finished goods and work-in-process		44,040			39,135
Raw materials		17,702			21,150
Materials in-transit		—			1,890
Less: inventory reserve		(5,964	)		(4,898	)

Inventories, net	$	73,267		$	71,611

Changes in inventory reserve for the years ended December 31, 2019, 2018 and 2017 are as follows (in thousands):


	Year Ended December 31,
	2019			2018			2017
Beginning balance	$	(4,898	)	$	(6,391	)	$	(7,177	)
Change in reserve
Inventory reserve charged to costs of sales		(13,855	)		(8,269	)		(7,017	)
Sale of previously reserved inventory		3,067			4,098			6,003

		(10,788	)		(4,171	)		(1,014	)
Write off		9,189			5,479			2,641
Translation adjustments		533			185			(841	)

Ending balance	$	(5,964	)	$	(4,898	)	$	(6,391	)

Inventory reserve represents the Company’s best estimate in value lost due to excessive inventory level, physical deterioration, obsolescence, changes in price levels, or other causes based on individual facts and circumstances. Inventory reserve relates to inventory items including finished goods, semi-finished goods,

work-in-process

and raw materials. Write off of this reserve is recognized only when the related inventory has been disposed or scrapped.

During the first half of 2019, the Company recorded inventory reserves of $5,475 thousand related to certain legacy display products.

Accounts Receivable - Schedule of Changes in Sales Return Reserve (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Beginning balance	$ (439)	$ (628)	$ (1,107)
Provision	(136)	(245)	(40)
Usage	170	414	626
Translation adjustments	18	20	(107)
Ending balance	$ (387)	$ (439)	$ (628)

Equity Incentive Plans - Summary of Stock Option Activities (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Outstanding Beginning Balance, Number of Options	2,674,756	2,871,904	3,428,665
Granted, Number of Options			70,865
Forfeited, Number of Options	(44,892)	(34,807)	(88,443)
Exercised, Number of Options	(452,819)	(162,341)	(539,183)
Outstanding Ending Balance, Number of Options	2,177,045	2,674,756	2,871,904	3,428,665
Vested and expected to vest, Number of Options	2,177,045	2,674,266	2,865,475
Exercisable, Number of Options		2,544,565	2,395,979
Outstanding Beginning Balance, Weighted Average Exercise Price of Stock Options	$ 9.73	$ 9.59	$ 9.23
Granted, Weighted Average Exercise Price of Stock Options			10.43
Forfeited, Weighted Average Exercise Price of Stock Options	10.29	10.97	12.77
Exercised, Weighted Average Exercise Price of Stock Options	6.31	6.97	6.94
Outstanding Ending Balance, Weighted Average Exercise Price of Stock Options	10.42	9.73	9.59	$ 9.23
Vested and expected to vest, Weighted Average Exercise Price of Stock Options	$ 10.42	9.73	9.59
Exercisable, Weighted Average Exercise Price of Stock Options		$ 9.94	$ 10.11
Outstanding Beginning Balance, Aggregate Intrinsic Value of Stock Options	$ 395	$ 6,073	$ 525
Exercised, Aggregate Intrinsic Value of Stock Options	2,404	737	1,540
Outstanding Ending Balance, Aggregate Intrinsic Value of Stock Options	6,259	395	6,073	$ 525
Vested and expected to vest, Aggregate Intrinsic Value of Stock Options	$ 6,259	394	6,050
Exercisable, Aggregate Intrinsic Value of Stock Options		$ 306	$ 4,603
Outstanding, Weighted Average Remaining Contractual Life of Stock Options	4 years 8 months 12 days	5 years 2 months 12 days	6 years 2 months 12 days	6 years 8 months 12 days
Vested and expected to vest, Weighted Average Remaining Contractual Life of Stock Options	4 years 8 months 12 days	5 years 2 months 12 days	6 years 2 months 12 days
Exercisable, Weighted Average Remaining Contractual Life of Stock Options		5 years 1 month 6 days	5 years 8 months 12 days

Geographic and Segment Information (Tables)

12 Months Ended

Dec. 31, 2019

Segment Reporting [Abstract]

Schedule of Operating Segments

The following sets forth information relating to the operating segments (in thousands):


	Year Ended December 31,
	2019		2018		2017 As Adjusted
Net Sales
Foundry Services Group	$	307,144	$	325,312	$	350,395
Standard Products Group
Display Solutions		308,531		256,113		179,233
Power Solutions		176,245		169,284		149,836

Total Standard Products Group		484,776		425,397		329,069
All other		275		189		208

Total net sales	$	792,195	$	750,898	$	679,672


	Year Ended December 31,
	2019		2018		2017 As Adjusted
Gross Profit
Foundry Services Group	$	64,010	$	82,578	$	101,780
Standard Products Group		116,327		115,478		85,905
All other		274		40		208

Total gross profit	$	180,611	$	198,096	$	187,893

Disaggregation Of Revenue Recognition

Upon the adoption of the new revenue standard, the Company’s revenue for Foundry Services Group is disaggregated depending on the timing of revenue recognition (in thousands):


	Year Ended December 31, 2019
	Revenue recognized at the time of shipment or delivery		Revenue recognized over time		Total
Net Sales
Foundry Services Group	$	157,272	$	149,872	$	307,144

	Year Ended December 31, 2018
	Revenue recognized at the time of shipment or delivery		Revenue recognized over time		Total
Net Sales
Foundry Services Group	$	80,578	$	244,734	$	325,312

Net Sales by Region, Based on Location of Products are Billed

The following is a summary of net sales by geographic region, based on the location to which the products are billed (in thousands):


	Year Ended December 31,
	2019		2018		2017
Korea	$	249,385	$	282,516	$	279,883
Asia Pacific (other than Korea)		466,380		380,598		322,595
United States		28,109		37,483		35,089
Europe		46,421		47,831		41,109
Others		1,900		2,470		996

Total	$	792,195	$	750,898	$	679,672

Unaudited Quarterly Financial Results

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Unaudited Quarterly Financial Results

22. Unaudited Quarterly Financial Results

The following tables present selected unaudited Consolidated Statements of Operations for each quarter of the years ended December 31, 2019 and 2018.


	Fiscal Year 2019
	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
	(In thousands of US dollars, except share data)
Net sales	$	157,380		$	205,145		$	229,677		$	199,993
Gross profit		22,701			43,840			60,866			53,204
Operating income (loss)	$	(18,281	)		6,746			25,923			10,035
Net income (loss)	$	(34,125	)	$	(9,520	)	$	(1,607	)	$	23,426
Earnings (loss) per share:
Basic	$	(1.00	)	$	(0.28	)	$	(0.05	)	$	0.68
Diluted	$	(1.00	)	$	(0.28	)	$	(0.05	)	$	0.54
Weighted average common stock outstanding:
Basic		34,194,878			34,245,127			34,357,745			34,542,415
Diluted		34,194,878			34,245,127			34,357,745			46,078,768

	Fiscal Year 2018
	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
	(In thousands of US dollars, except share data)
Net sales	$	165,819		$	199,685		$	206,000		$	179,394
Gross profit		44,581			53,854			55,749			43,912
Operating income		7,379			13,914			18,265			7,860
Net income (loss)	$	2,763		$	(21,505	)	$	17,222		$	(2,380	)
Earnings (loss) per share:
Basic	$	0.08		$	(0.62	)	$	0.50		$	(0.07	)
Diluted	$	0.08		$	(0.62	)	$	0.41		$	(0.07	)
Weighted average common stock outstanding:
Basic		34,253,111			34,420,654			34,573,377			34,627,292
Diluted		35,154,693			34,420,654			46,021,610			34,627,292

Geographic and Segment Information - Schedule of Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total net sales	$ 199,993	$ 229,677	$ 205,145	$ 157,380	$ 179,394	$ 206,000	$ 199,685	$ 165,819	$ 792,195	$ 750,898	$ 679,672
Total gross profit	$ 53,204	$ 60,866	$ 43,840	$ 22,701	$ 43,912	$ 55,749	$ 53,854	$ 44,581	180,611	198,096	187,893
Foundry Services Group [Member]
Segment Reporting Information [Line Items]
Total net sales									307,144	325,312
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total net sales											30,306
Operating Segments [Member] \| Foundry Services Group [Member]
Segment Reporting Information [Line Items]
Total net sales									307,144	325,312	350,395
Total gross profit									64,010	82,578	101,780
Operating Segments [Member] \| Standard Products Group [Member]
Segment Reporting Information [Line Items]
Total net sales									484,776	425,397	329,069
Total gross profit									116,327	115,478	85,905
Operating Segments [Member] \| Standard Products Group [Member] \| Display Solutions [Member]
Segment Reporting Information [Line Items]
Total net sales									308,531	256,113	179,233
Operating Segments [Member] \| Standard Products Group [Member] \| Power Solutions [Member]
Segment Reporting Information [Line Items]
Total net sales									176,245	169,284	149,836
All Other [Member]
Segment Reporting Information [Line Items]
Total net sales									275	189	208
Total gross profit									$ 274	$ 40	$ 208

Accounts Receivable - Schedule of Accounts Receivable (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Receivables [Abstract]
Accounts receivable	$ 92,685	$ 80,155
Notes receivable	3,706	856
Allowances for doubtful accounts	(87)	(90)	$ (94)	$ (83)
Sales return reserves	(387)	(439)	$ (628)	$ (1,107)
Volume discounts	(276)	(479)
Accounts receivable, net	$ 95,641	$ 80,003

Accumulated Other Comprehensive Income (Loss)

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss)

20. Accumulated Other Comprehensive Loss

Accumulated other comprehensive loss consists of the following at December 31, 2019 and 2018, respectively (in thousands):


	Year Ended December 31,
	2019			2018
Foreign currency translation adjustments	$	(4,205	)	$	(20,061	)
Derivative adjustments		1,545			(49	)

Total	$	(2,660	)	$	(20,110	)

Changes in accumulated other comprehensive loss for the years ended December 31, 2019, 2018 and 2017 are as follows (in thousands):


Year Ended December 31, 2019	Foreign currency translation adjustments			Derivative adjustments			Total
Beginning balance	$	(20,061	)	$	(49	)	$	(20,110	)

Other comprehensive income (loss) before reclassifications		15,856			(2,894	)		12,962
Amounts reclassified from accumulated other comprehensive loss		—			4,488			4,488

Net current-period other comprehensive income		15,856			1,594			17,450

Ending balance	$	(4,205	)	$	1,545		$	(2,660	)


Year Ended December 31, 2018	Foreign currency translation adjustments			Derivative adjustments			Total
Beginning balance	$	(38,413	)	$	5,299		$	(33,114	)

Other comprehensive income (loss) before reclassifications		18,352			(1,589	)		16,763
Amounts reclassified from accumulated other comprehensive income		—			(3,759	)		(3,759	)

Net current-period other comprehensive income (loss)		18,352			(5,348	)		13,004

Ending balance	$	(20,061	)	$	(49	)	$	(20,110	)


Year Ended December 31, 2017	Foreign currency translation adjustments			Derivative adjustments			Total
Beginning balance	$	14,460		$	(436	)	$	14,024

Other comprehensive income (loss) before reclassifications		(52,873	)		7,736			(45,137	)
Amounts reclassified from accumulated other comprehensive income		—			(2,001	)		(2,001	)

Net current-period other comprehensive income (loss)		(52,873	)		5,735			(47,138	)

Ending balance	$	(38,413	)	$	5,299		$	(33,114	)

Early Termination Charges - Additional Information (Detail) - Headcount Reduction Plan [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2017 Employee-Position
Restructuring Cost and Reserve [Line Items]
Cash payments \| $	$ 31,000	$ 13,369
Number of employees elected to resign \| Employee-Position			352

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock Outstanding [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings (Deficit) [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance beginning at Dec. 31, 2016	$ (72,114)		$ 416	$ 130,189	$ (125,825)	$ (90,918)	$ 14,024
Balance, Shares beginning at Dec. 31, 2016		35,048,338
Stock-based compensation	2,336			2,336
Exercise of stock options	$ 3,744		6	3,738
Exercise of stock options, Shares	539,183	539,183
Settlement of restricted stock units			4	(4)
Settlement of restricted stock units, Shares		397,522
Acquisition of treasury stock	$ (11,401)					(11,401)
Acquisition of treasury stock, Shares	(1,795,444)	(1,795,444)
Other comprehensive income (loss) net	$ (47,138)						(47,138)
Net income (loss)	84,936				84,936
Balance ending at Dec. 31, 2017	(39,637)		426	136,259	(40,889)	(102,319)	(33,114)
Balance, Shares ending at Dec. 31, 2017		34,189,599
Balance as adjusted, beginning at Dec. 31, 2017	(31,153)		426	136,259	(32,405)	(102,319)	(33,114)
Stock-based compensation	5,213			5,213
Exercise of stock options	$ 1,133		2	1,131
Exercise of stock options, Shares	162,341	162,341
Settlement of restricted stock units			3	(3)
Settlement of restricted stock units, Shares		328,309
Acquisition of treasury stock	$ (1,607)					(1,607)
Acquisition of treasury stock, Shares		(239,017)
Other comprehensive income (loss) net	13,004						13,004
Net income (loss)	(3,900)				(3,900)
Balance ending at Dec. 31, 2018	$ (17,310)		431	142,600	(36,305)	(103,926)	(20,110)
Balance, Shares ending at Dec. 31, 2018	34,441,232	34,441,232
Impact of adopting the new revenue standard at Dec. 31, 2018	$ 8,484				8,484
Stock-based compensation	6,952			6,952
Exercise of stock options	$ 2,860		4	2,856
Exercise of stock options, Shares	452,819	452,819
Settlement of restricted stock units			4	(4)
Settlement of restricted stock units, Shares		344,714
Acquisition of treasury stock	$ (3,107)					(3,107)
Acquisition of treasury stock, Shares		(438,453)
Other comprehensive income (loss) net	17,450						17,450
Net income (loss)	(21,826)				(21,826)
Balance ending at Dec. 31, 2019	$ (14,981)		$ 439	$ 152,404	$ (58,131)	$ (107,033)	$ (2,660)
Balance, Shares ending at Dec. 31, 2019	34,800,312	34,800,312

Product Warranties (Tables)

12 Months Ended

Dec. 31, 2019

Guarantees and Product Warranties [Abstract]

Schedule of Changes in Accrued Warranty Liabilities

Changes in accrued warranty liabilities for the years ended December 31, 2019, 2018 and 2017 are as follows (in thousands):


	Year Ended December 31,
	2019			2018			2017
Beginning balance	$	610		$	1,060		$	466
Change in provision (reversal)		2,357			222			(224	)
Usage		(1,315	)		(636	)		(65	)
Translation adjustments		(6	)		(36	)		39

Ending balance	$	1,646		$	610		$	216

Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Foreign currency translation adjustments	$ (4,205)	$ (20,061)
Derivative adjustments	1,545	(49)
Total	$ (2,660)	$ (20,110)

- Definition

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

+ References + Details

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

As of December 31, 2019, the following table represents the Company’s assets measured at fair value on a recurring basis and the basis for that measurement (in thousands):


	Carrying Value December 31, 2019		Fair Value Measurement December 31, 2019		Quoted Prices in Active Markets for Identical Asset (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Derivative assets (other current assets)	$	1,456	$	1,456		—	$	1,456		—

As of December 31, 2018, the following table represents the Company’s liabilities measured at fair value on a recurring basis and the basis for that measurement (in thousands):


	Carrying Value December 31, 2018		Fair Value Measurement December 31, 2018		Quoted Prices in Active Markets for Identical Asset (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Liabilities:
Derivative liabilities (other current liabilities)	$	724	$	724		—	$	724		—

Schedule of Fair Value of Long-term Borrowings

Fair Value of Long-Term Borrowings


	December 31, 2019				December 31, 2018
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(In thousands of US dollars)
Long-Term Borrowings:
5.0 % Exchangeable Senior Notes due March 2021 (Level 2)	$	81,959	$	116,078	$	81,418	$	86,835
6.625 % S enior N otes due July 2021 (Level 2)	$	222,784	$	224,250	$	222,159	$	202,046

- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

+ References + Details

Geographic and Segment Information - Additional Information (Detail) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) Segments Customer CustomerSegments	Dec. 31, 2018 USD ($) Customer CustomerSegments	Dec. 31, 2017 USD ($) Customer CustomerSegments
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of operating segments \| Segments									2
Number of customers \| Customer									10	10	10
Number of customers greater than ten percent threshold \| CustomerSegments									1	2	1
Net sales	$ 199,993	$ 229,677	$ 205,145	$ 157,380	$ 179,394	$ 206,000	$ 199,685	$ 165,819	$ 792,195	$ 750,898	$ 679,672
Gross profit	$ 53,204	$ 60,866	$ 43,840	$ 22,701	$ 43,912	$ 55,749	$ 53,854	$ 44,581	180,611	198,096	187,893
Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales											30,306
Corporate, Non-Segment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross profit											6,322
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									$ 249,385	$ 282,516	$ 279,883
Customer Concentration Risk [Member] \| Net Sales [Member] \| Top Ten Customers [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage									67.00%	61.00%	57.00%
Customer Concentration Risk [Member] \| Net Sales [Member] \| Top Customer One [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage									32.90%	19.30%	15.60%
Customer Concentration Risk [Member] \| Net Sales [Member] \| Top Customer Two [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage										13.30%
Geographic Concentration Risk [Member] \| Net Sales [Member] \| Taiwan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage									20.90%	26.20%	36.40%
Geographic Concentration Risk [Member] \| Net Sales [Member] \| CHINA
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage									75.40%	66.60%	49.70%
Geographic Concentration Risk [Member] \| Property, Plant and Equipment [Member] \| Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage									98.00%

Long-term Borrowings - Components of Long-term Borrowings (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Less: unamortized discount and debt issuance costs	$ (3,247)	$ (5,583)
Long-term borrowings, net of unamortized discount and debt issuance costs	304,743	303,577
Exchangeable Senior Notes [Member] \| 5.0% Exchangeable Senior Notes due March 2021 [Member]
Debt Instrument [Line Items]
Long-term borrowings	83,740	84,660
Senior Notes [Member] \| 6.625% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Long-term borrowings	$ 224,250	$ 224,500

Accrued Severance Benefits (Tables)

12 Months Ended

Dec. 31, 2019

Postemployment Benefits [Abstract]

Changes in Accrued Severance Benefits

Changes in accrued severance benefits are as follows (in thousands):


	Year Ended December 31,
	2019			2018
Beginning balance	$	149,408		$	149,796
Provisions		17,139			17,644
Severance payments		(9,288	)		(11,688	)
Translation adjustments		(4,967	)		(6,344	)

		152,292			149,408
Less: Cumulative contributions to severance insurance deposit accounts		(4,781	)		(2,549	)
The National Pension Fund		(215	)		(230	)
Group severance insurance plan		(568	)		(598	)

Accrued severance benefits, net	$	146,728		$	146,031

Future Benefits Payments to Employees

The Company is liable to pay the following future benefits to its

non-executive

employees upon their normal retirement age (in thousands):


	Severance Benefit
2020	$	1,066
2021		1,546
2022		1,349
2023		1,776
2024		2,630
2025 – 2029		35,442

Derivative Financial Instruments - Offsetting of Derivative Assets and Liabilities (Details) - Zero Cost Collars [Member] $ in Thousands	Dec. 31, 2019 USD ($)
Asset Derivatives:
Asset Derivatives, Gross amounts of recognized assets/liabilities	$ 1,456
Asset Derivatives, Net amounts of assets/liabilities presented in the balance sheets	1,456
Asset Derivatives, Gross amounts not offset in the balance sheets, Cash collateral pledged	1,070
Asset Derivatives, Net amount	$ 2,526

Restructuring and Other Charges (Gains) - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended			12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2019	Mar. 31, 2019	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring-related charges			$ 53	$ 2,151		$ 9,195	$ (17,010)
Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Professional fees and other related charges						$ 6,991
Sensor Business [Member]
Restructuring Cost and Reserve [Line Items]
Proceeds from sale of business	$ 1,295
Net gain on sale of business	$ 375
Korea [Member] \| Buildings [Member]
Restructuring Cost and Reserve [Line Items]
Gross proceeds from sale of building		$ 18,204
Value-added tax, for sale of the building		1,655
Restricted cash		18,204
Deposits received		$ 16,549
Decrease in restricted cash due to release					$ 18,204
Korea [Member] \| Buildings [Member] \| Restructuring Gain [Member]
Restructuring Cost and Reserve [Line Items]
Gain on sale of machinery and building as part of restructuring					$ 16,635

Inventories - Changes in Inventory Reserve (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Beginning balance	$ (4,898)	$ (6,391)	$ (7,177)
Change in reserve
Inventory reserve charged to costs of sales	(13,855)	(8,269)	(7,017)
Sale of previously reserved inventory	3,067	4,098	6,003
Change in reserve	(10,788)	(4,171)	(1,014)
Write off	9,189	5,479	2,641
Translation adjustments	533	185	(841)
Ending balance	$ (5,964)	$ (4,898)	$ (6,391)

Foreign Currency Gain (Loss), Net - Additional Information (Detail) $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Foreign Currency Transaction [Abstract]
Exchange rates using first base rate	1,157.8	1,118.1	1,071.4
Intercompany loan balances	$ 686,485	$ 666,597	$ 677,267

Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Intangible Assets

Intangible assets as of December 31, 2019 and 2018 are comprised of the following (in thousands):


	December 31, 2019
	Gross amount		Accumulated amortization			Net amount
Technology	$	18,688	$	(18,688	)	$	—
Customer relationships		26,838		(26,838	)		—
Intellectual property assets		12,278		(8,264	)		4,014

Intangible assets, net	$	57,804	$	(53,790	)	$	4,014


	December 31, 2018
	Gross amount		Accumulated amortization			Net amount
Technology	$	19,350	$	(19,350	)	$	—
Customer relationships		27,791		(27,791	)		—
Intellectual property assets		11,571		(7,618	)		3,953

Intangible assets, net	$	58,712	$	(54,759	)	$	3,953

Business, Basis of Presentation and Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Detail)	12 Months Ended
	Dec. 31, 2019
Minimum [Member] \| Buildings [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, estimated useful lives	30 years
Minimum [Member] \| Buildings and Related Structures [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, estimated useful lives	10 years
Minimum [Member] \| Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, estimated useful lives	10 years
Minimum [Member] \| Others [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, estimated useful lives	3 years
Maximum [Member] \| Buildings [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, estimated useful lives	40 years
Maximum [Member] \| Buildings and Related Structures [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, estimated useful lives	20 years
Maximum [Member] \| Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, estimated useful lives	12 years
Maximum [Member] \| Others [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, estimated useful lives	10 years

Accounts Receivable - Schedule Of Changes in Volume Discounts Accounts Receivable (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Beginning balance	$ (479)
Provision	(1,852)	$ (1,378)
Usage	2,040	892
Translation adjustments	15	7
Ending balance	$ (276)	$ (479)

Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning	$ (17,310)	$ (39,637)	$ (72,114)
Total other comprehensive income (loss)	17,450	13,004	(47,138)
Balance ending	(14,981)	(17,310)	(39,637)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning	(20,061)	(38,413)	14,460
Other comprehensive income (loss) before reclassifications	15,856	18,352	(52,873)
Total other comprehensive income (loss)	15,856	18,352	(52,873)
Balance ending	(4,205)	(20,061)	(38,413)
Derivative Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning	(49)	5,299	(436)
Other comprehensive income (loss) before reclassifications	(2,894)	(1,589)	7,736
Amounts reclassified from accumulated other comprehensive loss	4,488	(3,759)	(2,001)
Total other comprehensive income (loss)	1,594	(5,348)	5,735
Balance ending	1,545	(49)	5,299
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning	(20,110)	(33,114)	14,024
Other comprehensive income (loss) before reclassifications	12,962	16,763	(45,137)
Amounts reclassified from accumulated other comprehensive loss	4,488	(3,759)	(2,001)
Total other comprehensive income (loss)	17,450	13,004	(47,138)
Balance ending	$ (2,660)	$ (20,110)	$ (33,114)

Accounts Receivable

12 Months Ended

Dec. 31, 2019

Receivables [Abstract]

Accounts Receivable

3. Accounts Receivable

Accounts receivable as of December 31, 2019 and 2018 consisted of the following (in thousands):


	December 31,
	2019			2018
Accounts receivable	$	92,685		$	80,155
Notes receivable		3,706			856
Less:
Allowances for doubtful accounts		(87	)		(90	)
Sales return reserves		(387	)		(439	)
Volume discounts		(276	)		(479	)

Accounts receivable, net	$	95,641		$	80,003

Changes in allowance for doubtful accounts for the years ended December 31, 2019, 2018 and 2017 are as follows (in thousands):


	Year Ended December 31,
	2019			2018			2017
Beginning balance	$	(90	)	$	(94	)	$	(83	)
Translation adjustments		3			4			(11	)

Ending balance	$	(87	)	$	(90	)	$	(94	)

Changes in sales return reserves for the years ended December 31, 2019, 2018 and 2017 are as follows (in thousands):


	Year Ended December 31,
	2019			2018			2017
Beginning balance	$	(439	)	$	(628	)	$	(1,107	)
Provision		(136	)		(245	)		(40	)
Usage		170			414			626
Translation adjustments		18			20			(107	)

Ending balance	$	(387	)	$	(439	)	$	(628	)

Changes in low yield compensation reserve for the year ended December 31, 2017 are as follows (in thousands):


	Year Ended December 31, 2017
Beginning balance	$	(432	)
Provision		(362	)
Usage		22
Translation adjustments		(72	)

Ending balance	$	(844	)

Beginning in the first quarter of 2018, the Company recognized the low yield compensation reserves as a component of cost of sales, which were previously recorded as a deduction of sales.

Changes in volume discounts for the years ended December 31, 2019 and 2018 are as follows (in thousands):


	Year Ended December 31,
	2019			2018
Beginning balance	$	(479	)	$	—
Provision		(1,852	)		(1,378	)
Usage		2,040			892
Translation adjustments		15			7

Ending balance	$	(276	)	$	(479	)

The Company has entered into an agreement to sell selected trade accounts receivable to a financial institution from time to time since March 2012. After the sale, the Company does not retain any interest in the receivables and the applicable financial institution collects these accounts receivable directly from the customer. The proceeds from the sales of these accounts receivable totaled $14,474 thousand, $25,266 thousand and $18,973 for the years ended December 31, 2019, 2018 and 2017, respectively, and these sales resulted in

pre-tax

losses of $45 thousand, $63 thousand and $55 thousand for the years ended December 31, 2019, 2018 and 2017, respectively, which are included in selling, general and administrative expenses in the consolidated statements of operations. Net proceeds of the accounts receivable sale program are recognized in the consolidated statements of cash flows as part of operating cash flows.

The Company uses receivable discount programs with certain customers. These discount arrangements allow the Company to accelerate collection of customers’ receivables.

Leases (Tables)

12 Months Ended

Dec. 31, 2019

Leases [Abstract]

Supplemental Balance Sheet Information Related To Leases [Table Text Block]

Supplemental balance sheet information related to leases is as follows (in thousands):


Leases	Classification	As of December 31, 2019
Assets
Operating lease	Operating lease right-of-use assets	$	11,482
Finance lease	Property, plant and equipment, net		2,151

Total leased assets		$	13,633

Liabilities
Current
Operating	Operating lease liabilities	$	2,036
Finance	Other current liabilities		252
Non-current
Operating	Non-current operating lease liabilities		9,446
Finance	Other non-current liabilities		1,971

Total lease liabilities		$	13,705

Lease, Cost [Table Text Block]

The components of lease cost included in the Company’s consolidated statements of operations, are as follows (in thousands):


	Year Ended December 31, 2019
Operating lease cost	$	3,154
Finance lease cost
Amortization of right-of-use assets		303
Interest on lease liabilities		178

Total lease cost	$	3,635

Other Lease Information [Table Text Block]

The above table does not include an immaterial cost of short-term leases and a variable lease payment during the year ended December 31, 2019.

Other lease information is as follows (in thousands):


	Year Ended December 31, 2019
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$	3,154
Operating cash flows from finance leases		178
Financing cash flows from finance leases		233


	As of December 31, 2019
Weighted average remaining lease term
Operating leases		12.5 years
Finance leases		10.4 years
Weighted average remaining lease rate
Operating leases		7.95	%
Finance leases		7.95	%

Schedule Of Future Minimum Lease Payments [Table Text Block]

The aggregate future lease payments for operating and finance leases as of December 31, 2019 are as follows (in thousands):


	Operating Leases			Finance Leases
2020	$	2,843		$	413
2021		1,355			413
2022		1,096			413
2023		1,088			413
2024		1,088			150
Thereafter		10,618			1,463

Total future lease payments		18,088			3,265
Less: Imputed interest		(6,606	)		(1,042	)

Present value of future payments	$	11,482		$	2,223

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

As of December 31, 2018, the minimum aggregate rental payments due under

non-cancelable

operating lease contracts are as follows (in thousands):


2019	$	4,319
2020		3,569
2021		1,570
2022		1,319
2023		1,309
2024 and thereafter		13,978

	$	26,064

Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Intangible asset, Gross amount	$ 57,804	$ 58,712
Accumulated amortization	(53,790)	(54,759)
Intangible asset, Net amount	4,014	3,953
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset, Gross amount	18,688	19,350
Accumulated amortization	(18,688)	(19,350)
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset, Gross amount	26,838	27,791
Accumulated amortization	(26,838)	(27,791)
Intellectual Property Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset, Gross amount	12,278	11,571
Accumulated amortization	(8,264)	(7,618)
Intangible asset, Net amount	$ 4,014	$ 3,953

Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Finished goods	$ 17,489	$ 14,334
Semi-finished goods and work-in-process	44,040	39,135
Raw materials	17,702	21,150
Materials in-transit		1,890
Less: inventory reserve	(5,964)	(4,898)		$ (6,391)	$ (7,177)
Inventories, net	$ 73,267	$ 71,611	$ 29,823

Subsequent Events

12 Months Ended

Dec. 31, 2019

Subsequent Events [Abstract]

Subsequent Events

23. Subsequent Events

Derivative contract

In January 2020, the Company and DB entered into a derivative contract of zero cost collars for the period from July 2020 to December 2020. The total notional amounts are $30,000 thousand. In connection with this contract, the Company paid $1,800 thousand

cash deposits to DB

Februa

ry 2020.

In February 2020, the Company and NFIK entered

into derivative contracts of zero cost collars

for the period from July 2020 to December 2020. The total notional amounts are $48,000 thousand.

Earnings (Loss) per Share - Additional Information (Detail) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Conversion Of Exchangeable Notes	10,153,620	10,438,187

Property, Plant and Equipment

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

5. Property, Plant and Equipment

Property, plant and equipment as of December 31, 2019 and 2018 are comprised of the following (in thousands):


	December 31,
	2019			2018
Buildings and related structures	$	68,828		$	70,665
Machinery and equipment		327,677			323,325
Finance lease right-of-use assets		2,457			—
Others		42,681			44,724

		441,643			438,714
Less: accumulated depreciation		(273,959	)		(251,962	)
Land		14,890			15,419

Property, plant and equipment, net	$	182,574		$	202,171

Aggregate depreciation expenses totaled $31,820, thousand $31,229 thousand and $27,498 thousand for the years ended December 31, 2019, 2018 and 2017, respectively.

As of June 29, 2018, the Company’s Korean subsidiary entered into an arrangement whereby it (i) acquired a water treatment facility from SK hynix for $4,172 thousand to support its fab in Gumi, Korea, and (ii) subsequently sold the water treatment facility for $4,172 thousand to a third party management company that the Company engaged to run the facility for a

10-year

term. This arrangement is accounted for as a financing due to the Company’s Korean subsidiary’s continuing involvement with the facility. As a result, on the acquisition date, the Company recorded $4,172 thousand as property, plant and equipment, net, which is depreciated over the water treatment facility’s estimated useful life. The Company also recorded the related liabilities of $553 thousand as other current liabilities and $3,619 thousand as other

non-current

liabilities, which relate to the financing and service portions, respectively, of the arrangement and are amortized using the effective interest method over the

10-year

contract period.

Equity Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Restricted Stock Unit Activities

The following summarizes restricted stock unit activities for the years ended December 31, 2019, 2018 and 2017.


	Number of Restricted Stock Units			Weighted Average Grant-Date Fair Value of Restricted Stock Units
Outstanding at January 1, 2017		566,389		$	6.03
Granted		172,716			11.15
Vested		(368,555	)		5.72
Settled of previous year vesting		(28,967	)		8.00
Forfeited		(830	)		8.33

Outstanding at December 31, 2017		340,753		$	8.80

Granted		739,231			9.64
Vested		(373,620	)		9.24
Unsettled		45,311			9.22
Forfeited		(33,462	)		10.31

Outstanding at December 31, 2018		718,213		$	9.39

Granted		711,719			11.85
Vested		(528,740	)		11.00
Unsettled		226,215			12.16
Settled of previous year vesting		(42,189	)		9.22
Forfeited		(41,915	)		10.00

Outstanding at December 31, 2019		1,043,303		$	10.83

Summary of Stock Option Activities


	Number of Options			Weighted Average Exercise Price of Stock Options		Aggregate Intrinsic Value of Stock Options		Weighted Average Remaining Contractual Life of Stock Options
Outstanding at January 1, 2017		3,428,665		$	9.23	$	525		6.7 years
Granted		70,865			10.43		—		—
Forfeited		(88,443	)		12.77		—		—
Exercised		(539,183	)		6.94		1,540		—

Outstanding at December 31, 2017		2,871,904		$	9.59	$	6,073		6.2 years

Vested and expected to vest at December 31, 2017		2,865,475			9.59		6,050		6.2 years
Exercisable at December 31, 2017		2,395,979			10.11		4,603		5.7 years

Outstanding at January 1, 2018		2,871,904		$	9.59	$	6,073		6.2 years
Forfeited		(34,807	)		10.97		—		—
Exercised		(162,341	)		6.97		737		—

Outstanding at December 31, 2018		2,674,756		$	9.73	$	395		5.2 years

Vested and expected to vest at December 31, 2018		2,674,266			9.73		394		5.2 years
Exercisable at December 31, 2018		2,544,565			9.94		306		5.1 years

Outstanding at January 1, 2019		2,674,756		$	9.73	$	395		5.2 years
Forfeited		(44,892	)		10.29		—		—
Exercised		(452,819	)		6.31		2,404		—

Outstanding at December 31, 2019		2,177,045		$	10.42	$	6,259		4.7 years

Vested and Exercisable at December 31, 2019		2,177,045		$	10.42	$	6,259		4.7 years

Assumptions used in Black-Scholes Option-Pricing Model on Weighted Average Basis

The following summarizes the grant-date fair value of options granted for the year ended December 31, 2017 and assumptions used in the Black-Scholes option-pricing model on a weighted average basis. For the year ended December 31, 2017, the expected volatility was estimated using historical volatility of the Company’s share prices.


	Year Ended December 31,
	2019		2018		2017
Grant-date fair value of option		—		—	$	5.02
Expected term		—		—		2.5 Years
Risk-free interest rate		—		—		1.2	%
Expected volatility		—		—		81.7	%
Expected dividends		—		—		—

Number and Weighted Average Grant-Date Fair Value of Unvested Stock Options

The number and weighted average grant-date fair value of the unvested stock options are as follows:


	Year Ended December 31,
	2019					2018					2017
	Number			Weighted Average Grant- Date Fair Value		Number			Weighted Average Grant- Date Fair Value		Number			Weighted Average Grant- Date Fair Value
Unvested options at the beginning of the period		130,191		$	1.54		475,925		$	2.19		897,421		$	1.72
Granted options during the period		—			—		—			—		70,865			5.02
Vested options during the period		(107,100	)		1.54		(313,160	)		2.51		(455,301	)		1.74
Forfeited options during the period		(345	)		1.54		(14,738	)		1.73		(19,031	)		1.77
Exercised options during the period		(22,746	)		1.54		(17,836	)		1.66		(18,029	)		1.59

Unvested options at the end of the period		0			—		130,191		$	1.54		475,925		$	2.19

Equity Incentive Plans - Summary of Restricted Stock Unit Activities (Detail) - Restricted Stock Units [Member] - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Restricted Stock Units, Outstanding Beginning Balance	718,213	340,753	566,389
Number of Restricted Stock Units, Granted	711,719	739,231	172,716
Number of Restricted Stock Units, Vested	(528,740)	(373,620)	(368,555)
Number of Restricted Stock Units, Settled of previous year vesting	$ (42,189)		$ (28,967)
Number of Restricted Stock Units, Unsettled	$ 226,215	$ 45,311
Number of Restricted Stock Units, Forfeited	(41,915)	(33,462)	(830)
Number of Restricted Stock Units, Outstanding Ending Balance	1,043,303	718,213	340,753
Weighted Average Grant-Date Fair Value of Restricted Stock Units, Outstanding Beginning Balance	$ 9.39	$ 8.80	$ 6.03
Weighted Average Grant-Date Fair Value of Restricted Stock Units, Granted	11.85	9.64	11.15
Weighted Average Grant-Date Fair Value of Restricted Stock Units, Vested	11.00	9.24	5.72
Weighted Average Grant-Date Fair Value of Restricted Stock Units, Settled of previous year vesting	9.22		8.00
Weighted Average Grant-Date Fair Value of Restricted Stock Units, Unsettled	12.16	9.22
Weighted Average Grant-Date Fair Value of Restricted Stock Units, Forfeited	10.00	10.31	8.33
Weighted Average Grant-Date Fair Value of Restricted Stock Units, Outstanding Ending Balance	$ 10.83	$ 9.39	$ 8.80

Leases - Minimum aggregate rental payments due (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
2019	$ 2,843	$ 4,319
2020	1,355	3,569
2021	1,096	1,570
2022	1,088	1,319
2023	1,088	1,309
2024 and thereafter	10,618	13,978
Operating Leases, Total future lease payments	$ 18,088	$ 26,064

Accrued Severance Benefits - Changes in Accrued Severance Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Postemployment Benefits [Abstract]
Beginning balance	$ 149,408	$ 149,796
Provisions	17,139	17,644	$ 24,373
Severance payments	(9,288)	(11,688)	(21,506)
Translation adjustments	(4,967)	(6,344)
Ending balance	152,292	149,408	$ 149,796
Less: Cumulative contributions to severance insurance deposit accounts	(4,781)	(2,549)
The National Pension Fund	(215)	(230)
Group severance insurance plan	(568)	(598)
Accrued severance benefits, net	$ 146,728	$ 146,031

Subsequent Events - Additional Information (Detail) - Subsequent Event [Member] - USD ($) $ in Thousands	Feb. 01, 2020	Jan. 31, 2020
Nomura Financial Investment (Korea) Co., Ltd. [Member]
Derivative, Notional Amount	$ 48,000
Deutsche Bank AG, Seoul Branch [Member]
Derivative, Notional Amount		$ 30,000
Margin Deposit Assets		$ 1,800

Leases - Components of lease cost (Detail) $ in Thousands	12 Months Ended
Leases - Components of lease cost (Detail) $ in Thousands	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating lease cost	$ 3,154
Finance lease cost [Abstract]
Amortization of right-of-use assets	303
Interest on lease liabilities	178
Total lease cost	$ 3,635