0001193125-26-214750 | 10-Q | XBRL Viewer | Magnachip Semiconductor Corp

Foreign Currency Loss, Net	3 Months Ended
Mar. 31, 2026
Foreign Currency [Abstract]
Foreign Currency Loss, Net	12. Foreign Currency 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 MSK, the Company’s Korean subsidiary. The loans are denominated in U.S. dollars and are affected by changes in the exchange rate between the Korean won and the U.S. dollar. As of March 31, 2026 and December 31, 2025, the outstanding intercompany loan balances including accrued interest between MSK and the Dutch subsidiary were $76,000 thousand and $75,063 thousand, respectively. The Korean won to U.S. dollar exchange rates were 1,513.4:1 and 1,434.9:1 using the first base rate as of March 31, 2026 and December 31, 2025, respectively, as quoted by the KEB Hana Bank.

Foreign Currency Loss, Net

3 Months Ended

Mar. 31, 2026

12. Foreign Currency 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 MSK, the Company’s Korean subsidiary. The loans are denominated in U.S. dollars and are affected by changes in the exchange rate between the Korean won and the U.S. dollar. As of March 31, 2026 and December 31, 2025, the outstanding intercompany loan balances including accrued interest between MSK and the Dutch subsidiary were $76,000 thousand and $75,063 thousand, respectively. The Korean won to U.S. dollar exchange rates were 1,513.4:1 and 1,434.9:1 using the first base rate as of March 31, 2026 and December 31, 2025, respectively, as quoted by the KEB Hana Bank.

- Definition

The entire disclosure for foreign currency transactions and translation. This may include description of foreign currency transactions, foreign currency gains and losses, explanation of change in cumulative translation adjustment, description of effect of subsequent foreign currency exchange rate change, cumulative translation adjustment movement, foreign currency translation adjustment by component movement, translation adjustment for net investment hedge movement, adjustment for long-term intercompany transactions, schedule of long-term intercompany balances and any other foreign currency transactions and translation related items.

+ References + Details

Accumulated Other Comprehensive Loss

3 Months Ended

Mar. 31, 2026

Equity [Abstract]

Accumulated Other Comprehensive Loss

15. Accumulated Other Comprehensive Loss

Accumulated other comprehensive loss consists of the following as of March 31, 2026 and December 31, 2025, respectively (in thousands):


	March 31, 2026			December 31, 2025
Foreign currency translation adjustments	$	(26,068	)	$	(18,093	)
Derivative adjustments		(4,183	)		(715	)
Total	$	(30,251	)	$	(18,808	)

Changes in accumulated other comprehensive loss for the three months ended March 31, 2026 and 2025 are as follows (in thousands):


Three Months Ended March 31, 2026	Foreign currency translation adjustments			Derivative adjustments			Total
Beginning balance	$	(18,093	)	$	(715	)	$	(18,808	)
Other comprehensive loss before reclassifications		(7,975	)		(3,693	)		(11,668	)
Amounts reclassified from accumulated other comprehensive loss		—			225			225
Net current-period other comprehensive loss		(7,975	)		(3,468	)		(11,443	)
Ending balance	$	(26,068	)	$	(4,183	)	$	(30,251	)


Three Months Ended March 31, 2025	Foreign currency translation adjustments			Derivative adjustments			Total
Beginning balance	$	(20,927	)	$	(966	)	$	(21,893	)
Other comprehensive income before reclassifications		755			136			891
Amounts reclassified from accumulated other comprehensive loss		—			525			525
Net current-period other comprehensive income		755			661			1,416
Ending balance	$	(20,172	)	$	(305	)	$	(20,477	)

CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares	Mar. 31, 2026	Dec. 31, 2025
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	58,249,450	58,027,696
Common stock, shares outstanding	36,440,854	36,219,100
Treasury stock, shares	21,808,596	21,808,596

Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Inventory Disclosure [Abstract]
Finished goods	$ 8,310	$ 7,542
Semi-finished goods and work-in-process	26,447	29,245
Raw materials	4,169	4,198
Materials in-transit	65	0
Less: inventory reserve	(6,143)	(6,834)	$ (8,754)	$ (7,732)
Inventories, net	$ 32,848	$ 34,151

Derivative Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2026

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Details of Zero Cost Collar Contracts

Details of the zero cost collar contracts as of March 31, 2026 are as follows (in thousands):


Date of transaction	Total notional amount		Month of settlement
July 10, 2025	$	9,000	April 2026 to June 2026
July 17, 2025	$	9,000	July 2026 to September 2026
September 30, 2025	$	21,000	April 2026 to December 2026
November 07, 2025	$	42,000	April 2026 to June 2027

Details of the zero cost collar contracts as of December 31, 2025 are as follows (in thousands):


Date of transaction	Total notional amount		Month of settlement
February 03, 2025	$	9,000	January 2026 to March 2026
July 10, 2025	$	9,000	April 2026 to June 2026
July 17, 2025	$	9,000	July 2026 to September 2026
September 30, 2025	$	27,000	January 2026 to December 2026
November 07, 2025	$	42,000	April 2026 to June 2027

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 contracts recorded as assets and liabilities as of March 31, 2026 and December 31, 2025 are as follows (in thousands):


Derivatives designated as hedging instruments:		March 31, 2026		December 31, 2025
Assets Derivatives:
Zero cost collars	Other current assets	$	—	$	3
Liability Derivatives:
Zero cost collars	Other current liabilities	$	4,712	$	1,644
Zero cost collars	Other non-current liabilities	$	458	$	126

Offsetting of Derivative Assets and Liabilities

Offsetting of derivative liabilities as of March 31, 2026 is as follows (in thousands):


	Gross amounts		Gross amounts		Net amounts of liabilities		Gross amounts not offset in the balance sheets
As of March 31, 2026	of recognized liabilities		offset in the balance sheets		presented in the balance sheets		Financial instruments		Cash collateral pledged			Net amount
Liability Derivatives:
Zero cost collars	$	5,170	$	—	$	5,170	$	—	$	(4,970	)	$	200

Offsetting of derivative assets and liabilities as of December 31, 2025 is as follows (in thousands):


	Gross amounts		Gross amounts		Net amounts of assets/liabilities		Gross amounts not offset in the balance sheets
As of December 31, 2025	of recognized assets/liabilities		offset in the balance sheets		presented in the balance sheets		Financial instruments		Cash collateral pledged			Net amount
Asset Derivatives:
Zero cost collars	$	3	$	—	$	3	$	—	$	—		$	3
Liability Derivatives:
Zero cost collars	$	1,770	$	—	$	1,770	$	—	$	(1,200	)	$	570

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 three months ended March 31, 2026 and 2025 (in thousands):


Derivatives in ASC 815 Cash Flow Hedging Relationships	Amount of Gain (Loss) Recognized in AOCI on Derivatives					Location/Amount of Loss Reclassified from AOCI Into Statement of Operations							Location/Amount of Gain (Loss) Recognized in Statement of Operations on Derivatives
	Three Months Ended March 31,						Three Months Ended March 31,							Three Months Ended March 31,
	2026			2025			2026			2025				2026			2025
Zero cost collars	$	(3,693	)	$	136	Net sales	$	(225	)	$	(525	)	Other income (loss), net	$	(20	)	$	29
	$	(3,693	)	$	136		$	(225	)	$	(525	)		$	(20	)	$	29

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Income Tax Contingency [Line Items]
Income tax expense (benefit)	$ (1,908)	$ (401)

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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+ Details

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Net loss	$ (4,647)	$ (8,878)
Other comprehensive income (loss)
Foreign currency translation adjustments	(7,975)	755
Derivative adjustments	(3,468)	661
Total other comprehensive income (loss)	(11,443)	1,416
Total comprehensive loss	$ (16,090)	$ (7,462)

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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- Definition

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

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+ Details

Discontinued Operations

3 Months Ended

Mar. 31, 2026

Discontinued Operations and Assets Held for Sale [Abstract]

Discontinued Operations

2. Discontinued Operations

On March 7, 2025, the Company’s Board of Directors authorized a strategy to transition to a pure-play Power company, focusing future investments on the Power Analog Solutions and Power IC businesses. In connection with this strategy, the Company evaluated various strategic alternatives for its Display business, including a sale, merger, joint venture, licensing, or wind-down; however, the Company was unable to complete a transaction on terms that the Company’s Board of Directors believed were in the best interests of the Company and its stockholders.

Accordingly, on April 6, 2025, the Company’s Board of Directors unanimously approved the decision to shut down the Company’s Display business (the “Discontinued Business”), including the liquidation of MMS, the Company’s indirect wholly owned subsidiary that operated the Display business. As a result, the Display business qualifies as a discontinued operation in accordance with ASC 205-20.

The following table summarizes the results from discontinued operations, net of tax, for the three months ended March 31, 2026 and 2025 (in thousands):


	Three Months Ended
	March 31, 2026			March 31, 2025
Net sales	$	1,646		$	9,556
Cost of sales		1,154			6,439
Gross profit		492			3,117
Operating expenses:
Selling, general and administrative expenses		108			1,543
Research and development expenses		133			6,281
Other charges		—			127
Total operating expenses		241			7,951
Operating income (loss) from discontinued operations		251			(4,834	)
Interest income		—			131
Interest expense		(14	)		(120	)
Foreign currency gain (loss), net		49			(4	)
Other income, net		8			—
Income (Loss) from discontinued operations before income tax expense, net		294			(4,827	)
Income tax expense, net		244			—
Income (Loss) from discontinued operations, net of tax	$	50		$	(4,827	)

The following table presents the major classes of assets and liabilities of the discontinued operations that were included in the consolidated balance sheets (in thousands):


	March 31, 2026		December 31, 2025
Accounts receivable, net	$	1,572	$	2,689
Inventories, net		2,981		2,252
Accrued severance benefits, net		32		24

The following table provides supplemental cash flows information related to discontinued operations (in thousands):


	Three Months Ended
	March 31, 2026		March 31, 2025
Significant non-cash operating activities:
Depreciation and amortization	$	5	$	153
Provision for severance benefits		10		207
Stock-based compensation		—		162
Investing activities:
Capital expenditures	$	—	$	—

Although the Company has discontinued our Display business, certain limited activities remain active solely for the purpose of completing the orderly wind-down of operations and fulfilling pre-existing customer obligations, including the sale of “end of life” (“EOL”) Display products, which is being conducted by MSK. A small team has been retained exclusively to facilitate these wind-down activities.

As such, the result of these limited ongoing activities do not qualify for presentation as part of continuing operations and are instead presented as part of discontinued operations. The following table presents the revenue, gross profit and operating expenses related to the Company’s continuing involvement with the Discontinued Business for the period presented (in thousands):


	Three Months Ended March 31, 2026
Net sales	$	1,646
Gross profit		1,154
Operating expenses		247

Derivative Financial Instruments

3 Months Ended

Mar. 31, 2026

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

8. Derivative Financial Instruments

The Company’s Korean subsidiary, Magnachip Semiconductor, Ltd., from time to time has entered into zero cost collar contracts to hedge the risk of changes in the functional-currency-equivalent cash flows attributable to currency rate changes on U.S. dollar denominated revenues.

Details of the zero cost collar contracts as of March 31, 2026 are as follows (in thousands):


Date of transaction	Total notional amount		Month of settlement
July 10, 2025	$	9,000	April 2026 to June 2026
July 17, 2025	$	9,000	July 2026 to September 2026
September 30, 2025	$	21,000	April 2026 to December 2026
November 07, 2025	$	42,000	April 2026 to June 2027

Details of the zero cost collar contracts as of December 31, 2025 are as follows (in thousands):


Date of transaction	Total notional amount		Month of settlement
February 03, 2025	$	9,000	January 2026 to March 2026
July 10, 2025	$	9,000	April 2026 to June 2026
July 17, 2025	$	9,000	July 2026 to September 2026
September 30, 2025	$	27,000	January 2026 to December 2026
November 07, 2025	$	42,000	April 2026 to June 2027

The zero cost collar 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 contracts recorded as assets and liabilities as of March 31, 2026 and December 31, 2025 are as follows (in thousands):


Derivatives designated as hedging instruments:		March 31, 2026		December 31, 2025
Assets Derivatives:
Zero cost collars	Other current assets	$	—	$	3
Liability Derivatives:
Zero cost collars	Other current liabilities	$	4,712	$	1,644
Zero cost collars	Other non-current liabilities	$	458	$	126

Offsetting of derivative liabilities as of March 31, 2026 is as follows (in thousands):


	Gross amounts		Gross amounts		Net amounts of liabilities		Gross amounts not offset in the balance sheets
As of March 31, 2026	of recognized liabilities		offset in the balance sheets		presented in the balance sheets		Financial instruments		Cash collateral pledged			Net amount
Liability Derivatives:
Zero cost collars	$	5,170	$	—	$	5,170	$	—	$	(4,970	)	$	200

Offsetting of derivative assets and liabilities as of December 31, 2025 is as follows (in thousands):


	Gross amounts		Gross amounts		Net amounts of assets/liabilities		Gross amounts not offset in the balance sheets
As of December 31, 2025	of recognized assets/liabilities		offset in the balance sheets		presented in the balance sheets		Financial instruments		Cash collateral pledged			Net amount
Asset Derivatives:
Zero cost collars	$	3	$	—	$	3	$	—	$	—		$	3
Liability Derivatives:
Zero cost collars	$	1,770	$	—	$	1,770	$	—	$	(1,200	)	$	570

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 or loss (“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 three months ended March 31, 2026 and 2025 (in thousands):


Derivatives in ASC 815 Cash Flow Hedging Relationships	Amount of Gain (Loss) Recognized in AOCI on Derivatives					Location/Amount of Loss Reclassified from AOCI Into Statement of Operations							Location/Amount of Gain (Loss) Recognized in Statement of Operations on Derivatives
	Three Months Ended March 31,						Three Months Ended March 31,							Three Months Ended March 31,
	2026			2025			2026			2025				2026			2025
Zero cost collars	$	(3,693	)	$	136	Net sales	$	(225	)	$	(525	)	Other income (loss), net	$	(20	)	$	29
	$	(3,693	)	$	136		$	(225	)	$	(525	)		$	(20	)	$	29

As of March 31, 2026, the amount expected to be reclassified from accumulated other comprehensive loss into loss within the next 12 months is $3,812 thousand.

The Company is required to deposit additional cash collateral with Nomura Financial Investment (Korea) Co., Ltd. (“NFIK”) for any exposure in excess of $500 thousand. As of March 31, 2026, $4,970 thousand of additional cash collateral were required by NFIK and recorded as hedge collateral on the consolidated balance sheet. As of December 31, 2025, $1,200 thousand of additional cash collateral were required by NFIK and recorded as hedge collateral on the consolidated balance sheet.

These zero cost collar contracts may be terminated by the counterparty 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.

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

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+ Details

Leases (Tables)

3 Months Ended

Mar. 31, 2026

Leases [Abstract]

Supplemental Balance Sheet Information Related to Leases

Supplemental balance sheets information related to leases as of March 31, 2026 and December 31, 2025 are as follows (in thousands):


Leases	Classification	March 31, 2026		December 31, 2025
Assets
Operating lease	Operating lease right-of-use assets	$	1,797	$	2,070
Finance lease	Property, plant and equipment, net		176		217
Total lease assets		$	1,973	$	2,287
Liabilities
Current
Operating lease	Operating lease liabilities	$	1,344	$	1,427
Finance lease	Other current liabilities		115		130
Non-current
Operating lease	Non-current operating lease liabilities		509		690
Finance lease	Other non-current liabilities		97		128
Total lease liabilities		$	2,065	$	2,375

Lease, Cost

The following table presents the weighted average remaining lease term and discount rate:


	March 31, 2026			December 31, 2025
Weighted average remaining lease term
Operating leases	1.4 years			1.5 years
Finance leases	1.9 years			2.1 years
Weighted average discount rate
Operating leases		6.0	%		6.5	%
Finance leases		7.0	%		7.0	%

Other Lease Information

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


	Three Months Ended
	March 31, 2026		March 31, 2025
Operating lease cost	$	371	$	484
Finance lease cost
Amortization of right-of-use assets		30		36
Interest on lease liabilities		4		7
Total lease cost	$	405	$	527

The above table does not include an immaterial cost of short-term leases for the three months ended March 31, 2026 and 2025.

Other lease information associated with continuing operations is as follows (in thousands):


	Three Months Ended
	March 31, 2026		March 31, 2025
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$	358	$	622
Operating cash flows from finance leases		4		7
Financing cash flows from finance leases		34		38

Schedule of Future Lease Payments

The aggregate future lease payments for operating and finance leases as of March 31, 2026 are as follows (in thousands):


	Operating Leases			Finance Leases
Remainder of 2026	$	1,114		$	100
2027		749			104
2028		68			21
2029		1			2
Total future lease payments		1,932			227
Less: Imputed interest		(79	)		(15	)
Present value of future payments	$	1,853		$	212

Leases - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Non cash transaction amount of lease liabilities arising from obtaining right of use assets	$ 185	$ 966
Minimum [Member]
Lease Agreements Remaining Term of Lease	1 year
Maximum [Member]
Lease Agreements Remaining Term of Lease	4 years

Accrued Severance Benefits - Changes in Accrued Severance Benefits (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Postemployment Benefits [Abstract]
Beginning balance	$ 37,060	$ 45,594
Provisions	1,212	1,514
Severance payments	(228)	(325)
Translation adjustments	(1,950)	103
Ending balance	36,094	46,886
Less: Cumulative contributions to severance insurance deposit accounts	(24,419)	(28,821)
The National Pension Fund	(15)	(24)
Accrued severance benefits, net	$ 11,660	$ 18,041	$ 11,502

Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 179,727	$ 194,232
Less: accumulated depreciation	(119,380)	(128,171)
Land	11,073	11,679
Construction in progress	23,652	22,464
Property, plant and equipment, net	95,072	100,204
Buildings and Related Structures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	23,143	24,371
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	128,225	137,024
Finance Lease Right-of-Use Assets [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	470	495
Others [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 27,889	$ 32,342

Inventories (Tables)

3 Months Ended

Mar. 31, 2026

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories as of March 31, 2026 and December 31, 2025 consist of the following (in thousands):


	March 31, 2026			December 31, 2025
Finished goods	$	8,310		$	7,542
Semi-finished goods and work-in-process		26,447			29,245
Raw materials		4,169			4,198
Materials in-transit		65			—
Less: inventory reserve		(6,143	)		(6,834	)
Inventories, net	$	32,848		$	34,151

Changes in Inventory Reserve

Changes in inventory reserve for the three months ended March 31, 2026 and 2025 are as follows (in thousands):


	Three Months Ended
	March 31, 2026			March 31, 2025
Beginning balance	$	(6,834	)	$	(7,732	)
Change in reserve
Inventory reserve charged to costs of sales		(1,161	)		(2,299	)
Sale of previously reserved inventory		1,455			1,268
		294			(1,031	)
Write off		20			197
Translation adjustments		377			(188	)
Ending balance	$	(6,143	)	$	(8,754	)

Loss Per Share - Schedule of Antidilutive Securities Excluded from the Computation of Loss Per Common Share (Detail) - shares	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding units and warrants excluded from computation of diluted earnings (loss) per share/unit (in shares)	222,448	728,792
Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding units and warrants excluded from computation of diluted earnings (loss) per share/unit (in shares)	1,373,835	1,783,538

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Cash flows from operating activities
Net loss	$ (4,647)	$ (8,878)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities
Depreciation and amortization	2,882	3,273
Provision for severance benefits	1,212	1,514
Loss (gain) on foreign currency, net	4,262	(35)
Provision (reversal) for inventory reserves	(321)	1,208
Stock-based compensation	643	1,030
Deferred income taxes	8	(415)
Others, net	74	225
Changes in operating assets and liabilities
Accounts receivable, net	1,611	635
Inventories	(191)	(3,259)
Other receivables	(1,547)	(811)
Prepaid expenses	(152)	1,233
Other current assets	(1,725)	970
Accounts payable	571	2,542
Other accounts payable	(254)	(2,622)
Accrued expenses	(1,068)	(111)
Accrued income taxes	(33)	(6)
Other current liabilities	593	(901)
Other non-current liabilities	53	354
Payment of severance benefits	(228)	(325)
Others, net	(187)	(290)
Net cash provided by (used in) operating activities	1,556	(4,669)
Cash flows from investing activities
Payment of hedge collateral	(3,785)	0
Proceeds from disposal of property, plant and equipment	49	0
Purchase of property, plant and equipment	(3,915)	(208)
Payment for intellectual property registration	(24)	(63)
Collection of guarantee deposits	1,891	21
Payment of guarantee deposits	(158)	(139)
Net cash used in investing activities	(5,942)	(389)
Cash flows from financing activities
Acquisition of treasury stock	(176)	(1,306)
Repayment of financing related to water treatment facility arrangement	(110)	(111)
Repayment of principal portion of finance lease liabilities	(34)	(38)
Net cash used in financing activities	(320)	(1,455)
Effect of exchange rates on cash and cash equivalents	(4,496)	557
Net decrease in cash and cash equivalents	(9,202)	(5,956)
Cash and cash equivalents at beginning of period	103,756	138,610
Cash and cash equivalents at end of period	94,554	132,654
Supplemental cash flow information
Cash paid for interest on long-term borrowings	384	321
Cash refunded for income taxes	(42)	(337)
Non-cash investing activities
Property, plant and equipment additions in other accounts payable	1,292	1,840
Non-cash financing activities
Unsettled common stock repurchases	$ 0	$ 247

Accrued Severance Benefits - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2026
Percentage of employees eligible for severance benefits	97.00%
Retirement age of employees	60 years
Korea [Member] \| Minimum [Member]
Korea's mandatory retirement age	60 years

Derivative Financial Instruments - Details of Zero Cost Collar Contracts (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Zero Cost Collar One [Member]
Derivative [Line Items]
Date of transaction	Jul. 10, 2025	Feb. 03, 2025
Total notional amount	$ 9,000	$ 9,000
Month of settlement, start	2026-04	2026-01
Month of settlement, end	2026-06	2026-03
Zero Cost Collar Two [Member]
Derivative [Line Items]
Date of transaction	Jul. 17, 2025	Jul. 10, 2025
Total notional amount	$ 9,000	$ 9,000
Month of settlement, start	2026-07	2026-04
Month of settlement, end	2026-09	2026-06
Zero Cost Collar Three [Member]
Derivative [Line Items]
Date of transaction	Sep. 30, 2025	Jul. 17, 2025
Total notional amount	$ 21,000	$ 9,000
Month of settlement, start	2026-04	2026-07
Month of settlement, end	2026-12	2026-09
Zero Cost Collar Four [Member]
Derivative [Line Items]
Date of transaction	Nov. 07, 2025	Sep. 30, 2025
Total notional amount	$ 42,000	$ 27,000
Month of settlement, start	2026-04	2026-01
Month of settlement, end	2027-06	2026-12
Zero Cost Collar Five [Member]
Derivative [Line Items]
Date of transaction		Nov. 07, 2025
Total notional amount		$ 42,000
Month of settlement, start		2026-04
Month of settlement, end		2027-06

Derivative Financial Instruments - Impact of Derivative Instruments on Consolidated Statement of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Derivative [Line Items]
Location/Amount of Gain (Loss)	$ 3,468	$ (661)
Cash Flow Hedging [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives	(3,693)	136
Cash Flow Hedging [Member] \| Other income (loss), net [Member]
Derivative [Line Items]
Location/Amount of Gain (Loss)	(20)	29
Cash Flow Hedging [Member] \| Net sales [Member]
Derivative [Line Items]
Location/Amount of Gain (Loss)	(225)	(525)
Zero Cost Collars [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives	(3,693)	136
Zero Cost Collars [Member] \| Cash Flow Hedging [Member] \| Other income (loss), net [Member]
Derivative [Line Items]
Location/Amount of Gain (Loss)	(20)	29
Zero Cost Collars [Member] \| Cash Flow Hedging [Member] \| Net sales [Member]
Derivative [Line Items]
Location/Amount of Gain (Loss)	$ (225)	$ (525)

- Definition

Amount, before tax and adjustments, of gain (loss) from increase (decrease) in value of excluded component of derivative designated and qualifying as hedge. Adjustments include, but are not limited to, reclassifications for sale and settlement, and amounts recognized under systematic and rational method.

+ References + Details

Discontinued Operations - Schedule of Results From Discontinued Operations (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Operating expenses:
Income (Loss) from discontinued operations, net of tax	$ 50	$ (4,827)
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	1,646	9,556
Cost of sales	1,154	6,439
Gross profit	492	3,117
Operating expenses:
Total operating expenses	241	7,951
Operating income (loss) from discontinued operations	251	(4,834)
Interest income	0	131
Interest expense	(14)	(120)
Foreign currency gain (loss), net	49	(4)
Other income, net	8	0
Income (Loss) from discontinued operations before income tax expense, net	294	(4,827)
Income tax expense, net	244	0
Income (Loss) from discontinued operations, net of tax	50	(4,827)
Selling, general and administrative expenses \| Discontinued Operations
Operating expenses:
Total operating expenses	108	1,543
Research and development expenses \| Discontinued Operations
Operating expenses:
Total operating expenses	133	6,281
Other charges \| Discontinued Operations
Operating expenses:
Total operating expenses	$ 0	$ 127

Business, Basis of Presentation and Significant Accounting Policies

3 Months Ended

Mar. 31, 2026

Accounting Policies [Abstract]

Business, Basis of Presentation and Significant Accounting Policies

1. Business, Basis of Presentation and Significant Accounting Policies

Business

Magnachip Semiconductor Corporation (together with its subsidiaries, the “Company”) is a designer and manufacturer of analog and mixed-signal power semiconductor platform solutions for various applications, including industrial, automotive, communication, consumer and computing.

The Company develops and manufactures Power discrete (“Power Analog Solutions”) products and develops Power integrated circuit (“IC”) products. Power Analog Solutions products include metal oxide semiconductor field effect transistors (“MOSFETs”) and insulated-gate bipolar transistors (“IGBTs”) for a range of devices, including televisions, smartphones, mobile phones, wearable devices, desktop personal computers (“PCs”), notebook PCs, tablet PCs, home appliance, other consumer electronics, automotive and industrial applications such as power suppliers, e-bikes, photovoltaic inverters, LED lighting and motor drives. Power IC products include AC-DC/DC-DC converters, LED drivers, regulators, power management integrated circuits (“PMICs”) and level shifter for a range of devices, including televisions, wearable devices, notebooks, tablet PCs and other consumer electronics, as well as automotive applications.

In 2024, the Power IC business was operated by Magnachip Mixed-Signal, Ltd. (“MMS”), which later transferred the business to Magnachip Semiconductor, Ltd. (“MSK”) effective January 1, 2025, pursuant to an intercompany business transfer agreement executed between MMS and MSK. The transfer was based on the mutual understanding that consolidating the Power Analog Solutions and Power IC businesses under a single company would create a more effective framework for expanding and strengthening the Company’s business for Power products.

Basis of Presentation

The accompanying unaudited interim consolidated financial statements of the Company have been prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”). These interim consolidated financial statements include normal recurring adjustments and the elimination of all intercompany accounts and transactions which are, in the opinion of management, necessary to provide a fair statement of the Company’s financial condition and results of operations for the periods presented. These interim consolidated financial statements are presented in accordance with Accounting Standards Codification (“ASC”) 270, “Interim Reporting” and, accordingly, do not include all of the information and note disclosures required by U.S. GAAP for complete financial statements.

The December 31, 2025 balance sheet data was derived from the Company’s audited financial statements, but does not include all disclosures required by U.S. GAAP. The interim consolidated financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2025.

There have been no material changes to the Company’s significant accounting policies as of and for the three months ended March 31, 2026 as compared to the significant accounting policies described in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2025.

Recent Accounting Pronouncements Not Yet Adopted

In November 2024, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2024-03, “Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses” (“ASU 2024-03”). Additionally, in January 2025, the FASB issued ASU 2025-01 to clarify the effective date of ASU 2024-03. ASU 2024-03 requires public companies to disclose, in the notes to the financial statements, specific information about certain costs and expenses at each interim and annual reporting period. This includes disclosing amounts related to purchases of inventory, employee compensation, depreciation, and intangible asset amortization. In addition, public companies will need to provide qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively. ASU 2024-03 is effective for public business entities for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption is permitted and the amendments in this update may be applied prospectively or retrospectively. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements and related disclosures.

Accrued Severance Benefits - Future Benefits Payments to Employees (Detail) $ in Thousands	Mar. 31, 2026 USD ($)
Postemployment Benefits [Abstract]
2027	$ 379
2028	0
2029	1,683
2030	2,113
2031	3,092
2032 - 2037	$ 17,093

Fair Value Measurements

3 Months Ended

Mar. 31, 2026

Fair Value Disclosures [Abstract]

Fair Value Measurements

9. Fair Value Measurements

Fair Value of Financial Instruments

As of March 31, 2026, 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 March 31, 2026		Fair Value Measurement March 31, 2026		Quoted Prices in Active Markets for Identical Liability (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Liabilities:
Derivative liabilities (Other current liabilities)	$	4,712	$	4,712		—	$	4,712		—
Derivative liabilities (Other non-current liabilities)	$	458	$	458		—	$	458		—

As of December 31, 2025, the following table represents the Company’s assets and liabilities measured at fair value on a recurring basis and the basis for that measurement (in thousands):


	Carrying Value December 31, 2025		Fair Value Measurement December 31, 2025		Quoted Prices in Active Markets for Identical Assets/Liability (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Derivative assets (Other current assets)	$	3	$	3		—	$	3		—
Liabilities:
Derivative liabilities (Other current liabilities)	$	1,644	$	1,644		—	$	1,644		—
Derivative liabilities (Other non-current liabilities)	$	126	$	126		—	$	126		—

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. The carrying value of the Company’s outstanding Term Loan and CAPEX Loan approximates its fair value because its interest rate reflects the market rate for the respective periods. The fair value of this debt is categorized within Level 2 of the fair value hierarchy.

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Section 50
-Paragraph 2
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478119/940-820-50-1

+ Details

Accrued Expenses - Summary of Accrued Expenses (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Payables and Accruals [Abstract]
Payroll, benefits and related taxes, excluding severance benefits	$ 4,331	$ 4,999
Withholding tax attributable to intercompany interest income	111	7
Outside service fees	556	841
Others	492	1,082
Accrued expenses	$ 5,490	$ 6,929

Leases - Components of Lease Cost (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Leases [Abstract]
Operating lease cost	$ 371	$ 484
Finance lease cost
Amortization of right-of-use assets	30	36
Interest on lease liabilities	4	7
Total lease cost	$ 405	$ 527

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Loss [Member]
Balance beginning at Dec. 31, 2024	$ 276,797	$ 574	$ 279,423	$ 244,576	$ (225,883)	$ (21,893)
Balance, Shares beginning at Dec. 31, 2024		36,912,118
Stock-based compensation	1,030		1,030
Settlement of restricted stock units		$ 1	(1)
Settlement of restricted stock units, Shares		72,962
Acquisition of treasury stock	(1,164)				(1,164)
Acquisition of treasury stock, Shares		(309,291)
Other comprehensive income (loss), net	1,416					1,416
Net loss	(8,878)			(8,878)
Balance ending at Mar. 31, 2025	269,201	$ 575	280,452	235,698	(227,047)	(20,477)
Balance, Shares ending at Mar. 31, 2025		36,675,789
Balance beginning at Dec. 31, 2025	$ 248,250	$ 579	281,537	214,852	(229,910)	(18,808)
Balance, Shares beginning at Dec. 31, 2025	36,219,100	36,219,100
Stock-based compensation	$ 643		643
Settlement of restricted stock units		$ 2	(2)
Settlement of restricted stock units, Shares		221,754
Other comprehensive income (loss), net	(11,443)					(11,443)
Net loss	(4,647)			(4,647)
Balance ending at Mar. 31, 2026	$ 232,803	$ 581	$ 282,178	$ 210,205	$ (229,910)	$ (30,251)
Balance, Shares ending at Mar. 31, 2026	36,440,854	36,440,854

- Definition

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

+ References

+ Details

- Definition

Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section S99
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+ Details

Discontinued Operations - Schedule of Cash Flow Information Related to Discontinued Operation (Detail) - Discontinued Operations [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Significant non-cash operating activities:
Depreciation and amortization	$ 5	$ 153
Provision for severance benefits	10	207
Stock-based compensation	0	162
Investing activities:
Capital expenditures	$ 0	$ 0

Subsequent Events

3 Months Ended

Mar. 31, 2026

Subsequent Events [Abstract]

Subsequent Events

18. Subsequent Events

Derivative contracts

In April 2026, the Company and NFIK entered into derivative contracts of zero cost collars for the period from April 2027 to September 2027. The total notional amounts are $18,000 thousand.

Accrued Expenses (Tables)

3 Months Ended

Mar. 31, 2026

Payables and Accruals [Abstract]

Summary of Accrued Expenses

Accrued expenses as of March 31, 2026 and December 31, 2025 are comprised of the following (in thousands):


	March 31, 2026		December 31, 2025
Payroll, benefits and related taxes, excluding severance benefits	$	4,331	$	4,999
Withholding tax attributable to intercompany interest income		111		7
Outside service fees		556		841
Others		492		1,082
Accrued expenses	$	5,490	$	6,929

Derivative Financial Instruments - Fair Values of Outstanding Zero Cost Collar and Forward Contracts Recorded as Assets and Liabilities (Detail) - Zero Cost Collars [Member] - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Asset Derivatives:
Other current assets	$ 0	$ 3
Liability Derivatives:
Other current liabilities	4,712	1,644
Other non-current liabilities	$ 458	$ 126
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent

- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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+ Details

Borrowings (Tables)

3 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

Schedule of Borrowings

Borrowings as of March 31, 2026 and December 31, 2025 are as follows (in thousands):


	March 31, 2026			December 31, 2025
Term Loan due March 2027	$	26,431		$	27,877
CAPEX Loans due June 2035		15,855			16,722
Total borrowings	$	42,286		$	44,599
Less: current portion of long-term borrowings		(26,431	)		—
Long-term borrowings	$	15,855		$	44,599

Schedule of Principal Repayments

As of March 31, 2026, the aggregate principal amount outstanding under the CAPEX Loans was approximately $15,855 thousand, and the scheduled principal repayment amounts are as following (in thousands):


	Principal Repayments
Remainder of 2026	$	—
2027	$	991
2028	$	1,982
2029	$	1,982
2030	$	1,982
2031 – 2035	$	8,918

- 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

Accumulated Other Comprehensive Loss - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive loss	$ 0	$ 0

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Leases

3 Months Ended

Mar. 31, 2026

Leases [Abstract]

Leases

6. Leases

The Company has operating and finance leases for buildings and other assets such as vehicles and office equipment. The Company’s leases have remaining lease terms ranging from one year to four years.

The tables below present financial information related to the Company’s leases.

Supplemental balance sheets information related to leases as of March 31, 2026 and December 31, 2025 are as follows (in thousands):


Leases	Classification	March 31, 2026		December 31, 2025
Assets
Operating lease	Operating lease right-of-use assets	$	1,797	$	2,070
Finance lease	Property, plant and equipment, net		176		217
Total lease assets		$	1,973	$	2,287
Liabilities
Current
Operating lease	Operating lease liabilities	$	1,344	$	1,427
Finance lease	Other current liabilities		115		130
Non-current
Operating lease	Non-current operating lease liabilities		509		690
Finance lease	Other non-current liabilities		97		128
Total lease liabilities		$	2,065	$	2,375

The following table presents the weighted average remaining lease term and discount rate:


	March 31, 2026			December 31, 2025
Weighted average remaining lease term
Operating leases	1.4 years			1.5 years
Finance leases	1.9 years			2.1 years
Weighted average discount rate
Operating leases		6.0	%		6.5	%
Finance leases		7.0	%		7.0	%

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


	Three Months Ended
	March 31, 2026		March 31, 2025
Operating lease cost	$	371	$	484
Finance lease cost
Amortization of right-of-use assets		30		36
Interest on lease liabilities		4		7
Total lease cost	$	405	$	527

The above table does not include an immaterial cost of short-term leases for the three months ended March 31, 2026 and 2025.

Other lease information associated with continuing operations is as follows (in thousands):


	Three Months Ended
	March 31, 2026		March 31, 2025
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$	358	$	622
Operating cash flows from finance leases		4		7
Financing cash flows from finance leases		34		38

Non-cash transaction amounts of lease liabilities arising from obtaining right-of-use assets were $185 thousand and $966 thousand for the three months ended March 31, 2026 and 2025, respectively.

The aggregate future lease payments for operating and finance leases as of March 31, 2026 are as follows (in thousands):


	Operating Leases			Finance Leases
Remainder of 2026	$	1,114		$	100
2027		749			104
2028		68			21
2029		1			2
Total future lease payments		1,932			227
Less: Imputed interest		(79	)		(15	)
Present value of future payments	$	1,853		$	212

Accrued Severance Benefits (Tables)

3 Months Ended

Mar. 31, 2026

Postemployment Benefits [Abstract]

Changes in Accrued Severance Benefits

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


	Three Months Ended
	March 31, 2026			March 31, 2025
Beginning balance	$	37,060		$	45,594
Provisions		1,212			1,514
Severance payments		(228	)		(325	)
Translation adjustments		(1,950	)		103
		36,094			46,886
Less: Cumulative contributions to severance insurance deposit accounts		(24,419	)		(28,821	)
The National Pension Fund		(15	)		(24	)
Accrued severance benefits, net	$	11,660		$	18,041

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
2027	$	379
2028	$	—
2029	$	1,683
2030	$	2,113
2031	$	3,092
2032 – 2037	$	17,093

Geographic and Other Information - Schedule of Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Total Net Sales	$ 46,208	$ 44,722
Total cost of sales	39,014	35,360
Total gross profit	7,194	9,362
Power solutions business
Segment Reporting Information [Line Items]
Total Net Sales	46,208	44,722
Operating Segments [Member] \| Power solutions business
Segment Reporting Information [Line Items]
Total Net Sales	46,208	44,722
Total cost of sales	39,014	35,360
Total gross profit	7,194	9,362
Operating Segments [Member] \| Power solutions business \| Power Analog Solutions [Member]
Segment Reporting Information [Line Items]
Total Net Sales	41,647	39,857
Total cost of sales	36,296	32,757
Total gross profit	5,351	7,100
Operating Segments [Member] \| Power solutions business \| Power Ic [Member]
Segment Reporting Information [Line Items]
Total Net Sales	4,561	4,865
Total cost of sales	2,718	2,603
Total gross profit	$ 1,843	$ 2,262

- Definition

The aggregate cost of goods produced and sold and services rendered during the reporting period.

+ References

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- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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+ Details

Geographic and Other Information - Net Sales by Region, Based on Location of Products are Billed (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 46,208	$ 44,722
Standard products business [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	46,208	44,722
Standard products business [Member] \| Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	20,666	21,716
Standard products business [Member] \| Asia Pacific (Other Than Korea) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	23,587	20,992
Standard products business [Member] \| United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	1,239	1,182
Standard products business [Member] \| Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 716	$ 832

- Definition

+ References

+ Details

Borrowings

3 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

Borrowings

11. Borrowings

Borrowings as of March 31, 2026 and December 31, 2025 are as follows (in thousands):


	March 31, 2026			December 31, 2025
Term Loan due March 2027	$	26,431		$	27,877
CAPEX Loans due June 2035		15,855			16,722
Total borrowings	$	42,286		$	44,599
Less: current portion of long-term borrowings		(26,431	)		—
Long-term borrowings	$	15,855		$	44,599

Term Loan

On March 26, 2024, Magnachip Semiconductor, Ltd., a Korean limited liability company (“MSK”) and indirect wholly owned subsidiary of the Company, executed a Standard Credit Agreement (together with its General Terms and Conditions, the “Loan Agreement”) with Korea Development Bank (“KDB”). In connection with the Loan Agreement, on March 26, 2024, MSK entered into a Kun-Pledge (Mortgage) Agreement (the “Pledge Agreement”) with KDB pursuant to which MSK pledged its real property and buildings located in Gumi, Korea (“Fab 3 properties”) in favor of KDB.

The Loan Agreement provides for a working capital term loan (the “Term Loan”) of KRW 40,000,000,000 (approximately $29,835 thousand based on the KRW/USD exchange rate of 1,340.7:1 as of March 26, 2024 as quoted by KEB Hana Bank), which was funded in full to MSK on March 26, 2024.

The Term Loan bears interest at a variable rate equal to the 3-month CD rate quoted by KDB, plus 1.21%, which rate is adjusted quarterly. The initial interest rate on the Term Loan was 4.86% per annum. The Term Loan requires monthly interest-only payments and matures on March 26, 2027, at which time the full principal balance will be due and payable. All obligations of MSK under the Loan Agreement and the Term Loan are secured by the Fab 3 properties pursuant to the Pledge Agreement.

As of March 31, 2026, approximately $26,431 thousand aggregate principal amount of the Term Loan was outstanding, bearing interest at a variable rate of 4.06% per annum as of that date.

CAPEX Loans

On December 16, 2024, MSK executed a Standard Credit Agreement (as amended) (together with its General Terms and Conditions, the “Equipment Financing Credit Agreement”) with KDB. In connection with the Equipment Financing Credit Agreement, on December 8, 2024, MSK also amended the Kun-Pledge Agreement (the “Equipment Pledge Agreement”) with KDB, originally executed on or about March 26, 2024, to increase the maximum secured amount and to expand the scope of collateral to include certain machinery and equipment owned by MSK, which are located in its fabrication facility located in Gumi, Korea (“Fab 3 machinery and equipment”).

The Equipment Financing Credit Agreement provides for loans for MSK’s capital expenditures (the “CAPEX Loans”) up to an aggregate of KRW 38,000,000,000 ($26,523 thousand based on the KRW/USD exchange rate of 1,432.7:1 as of December 16, 2024 as quoted by KEB Hana Bank), which have been and will be funded directly to capital expenditure supply vendors by KDB upon the submission of a request form by MSK with the necessary evidence such as purchase agreement, invoice and other documentation, as applicable.

The CAPEX Loans bear interest at a fixed rate quoted by the treasury bond market yield (a six-year Korea treasury bill rate). The CAPEX Loans mature in ten years from the initial loan disbursement date (the “Maturity Date”), with an initial two-year (measured from the first loan disbursement date) interest-only payment period during which only interest is paid monthly, followed by eight years of amortizing payments where the principal is repaid in equal installments every three months and interest is paid monthly. The Equipment Financing Credit Agreement contains customary representations of MSK in connection with the execution of the agreement and with each borrowing of the CAPEX Loans and customary terms and conditions for a secured equipment financing loan of this type in Korea. All obligations of MSK under the Equipment Financing Credit Agreement and the CAPEX Loans are secured by certain Fab 3 machinery and equipment pursuant to the Equipment Pledge Agreement.

During 2025, under its existing Equipment Financing Credit Agreement with KDB, MSK entered into three CAPEX Loans in the aggregate principal amount of KRW 23,995,000,000, consisting of (i) KRW 9,520,000,000 on June 26, 2025, (ii) KRW 5,075,000,000 on September 26, 2025, and (iii) KRW 9,400,000,000 on December 30, 2025 (approximately $15,855 thousand in the aggregate based on the KRW/USD exchange rate of 1,513.4:1 as of March 31, 2026, as quoted by KEB Hana Bank). The CAPEX Loans bear a weighted average interest rate of 2.91% per annum and mature on June 26, 2035.


	Principal Repayments
Remainder of 2026	$	—
2027	$	991
2028	$	1,982
2029	$	1,982
2030	$	1,982
2031 – 2035	$	8,918

Loss Per Share

3 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

Loss Per Share

16. Loss Per Share

The following table illustrates the computation of basic and diluted loss per common share for the three months ended March 31, 2026 and 2025:


	Three Months Ended
	March 31, 2026			March 31, 2025
	(In thousands of U.S. dollars, except share data)
Basic loss per common share
Loss from continuing operations	$	(4,697	)	$	(4,051	)
Income (Loss) from discontinued operations, net of tax		50			(4,827	)
Net loss	$	(4,647	)	$	(8,878	)
Basic weighted average common stock outstanding		36,407,581			36,887,841
Basic earnings (loss) per common share
Continuing operations	$	(0.13	)	$	(0.11	)
Discontinued operations	$	0.00		$	(0.13	)
Total	$	(0.13	)	$	(0.24	)
Diluted loss per common share
Loss from continuing operations	$	(4,697	)	$	(4,051	)
Income (Loss) from discontinued operations, net of tax		50			(4,827	)
Net loss	$	(4,647	)	$	(8,878	)
Basic weighted average common stock outstanding		36,407,581			36,887,841
Net effect of dilutive equity awards		—			—
Diluted weighted average common stock outstanding		36,407,581			36,887,841
Diluted earnings (loss) per common share
Continuing operations	$	(0.13	)	$	(0.11	)
Discontinued operations	$	0.00		$	(0.13	)
Total	$	(0.13	)	$	(0.24	)

Diluted earnings (loss) per common share adjusts basic earnings (loss) per common share for the potentially dilutive impact of stock options and restricted stock units. As the Company has reported loss from continuing operations for the three months ended March 31, 2026 and 2025, all potentially dilutive securities are antidilutive and accordingly not considered, therefore basic loss per common share equals diluted loss per common share.

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


	Three Months Ended
	March 31, 2026		March 31, 2025
Options		222,448		728,792
Restricted Stock Units		1,373,835		1,783,538

Discontinued Operations - Schedule of Discontinued Operation Income Loss From Discontinued Operation Disclosures (Details) - Korean Subsidiary [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($)
Discontinued Operation Income Loss From Discontinued Operation Disclosures [Line Items]
Gross profit	$ 1,154
Operating expenses	247
Sales [Member]
Discontinued Operation Income Loss From Discontinued Operation Disclosures [Line Items]
Net sales	$ 1,646

Subsequent Events - Additional Information (Detail) $ in Thousands	Apr. 30, 2026 USD ($)
Subsequent Event [Member] \| Commodity Contract [Member]
Derivative, Notional Amount	$ 18,000

Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025
Equity [Abstract]
Foreign currency translation adjustments	$ (26,068)		$ (18,093)
Derivative adjustments	(4,183)		(715)
Total	$ (30,251)	$ (18,808)	$ (18,808)

- Definition

Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.

+ References + Details

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Pay vs Performance Disclosure
Net Income (Loss)	$ (4,647)	$ (8,878)

- 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 (Tables)

3 Months Ended

Mar. 31, 2026

Fair Value Disclosures [Abstract]

Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

As of March 31, 2026, 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 March 31, 2026		Fair Value Measurement March 31, 2026		Quoted Prices in Active Markets for Identical Liability (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Liabilities:
Derivative liabilities (Other current liabilities)	$	4,712	$	4,712		—	$	4,712		—
Derivative liabilities (Other non-current liabilities)	$	458	$	458		—	$	458		—

As of December 31, 2025, the following table represents the Company’s assets and liabilities measured at fair value on a recurring basis and the basis for that measurement (in thousands):


	Carrying Value December 31, 2025		Fair Value Measurement December 31, 2025		Quoted Prices in Active Markets for Identical Assets/Liability (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Derivative assets (Other current assets)	$	3	$	3		—	$	3		—
Liabilities:
Derivative liabilities (Other current liabilities)	$	1,644	$	1,644		—	$	1,644		—
Derivative liabilities (Other non-current liabilities)	$	126	$	126		—	$	126		—

Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2026

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Loss

Accumulated other comprehensive loss consists of the following as of March 31, 2026 and December 31, 2025, respectively (in thousands):


	March 31, 2026			December 31, 2025
Foreign currency translation adjustments	$	(26,068	)	$	(18,093	)
Derivative adjustments		(4,183	)		(715	)
Total	$	(30,251	)	$	(18,808	)

Changes in Accumulated Other Comprehensive Loss

Changes in accumulated other comprehensive loss for the three months ended March 31, 2026 and 2025 are as follows (in thousands):


Three Months Ended March 31, 2026	Foreign currency translation adjustments			Derivative adjustments			Total
Beginning balance	$	(18,093	)	$	(715	)	$	(18,808	)
Other comprehensive loss before reclassifications		(7,975	)		(3,693	)		(11,668	)
Amounts reclassified from accumulated other comprehensive loss		—			225			225
Net current-period other comprehensive loss		(7,975	)		(3,468	)		(11,443	)
Ending balance	$	(26,068	)	$	(4,183	)	$	(30,251	)


Three Months Ended March 31, 2025	Foreign currency translation adjustments			Derivative adjustments			Total
Beginning balance	$	(20,927	)	$	(966	)	$	(21,893	)
Other comprehensive income before reclassifications		755			136			891
Amounts reclassified from accumulated other comprehensive loss		—			525			525
Net current-period other comprehensive income		755			661			1,416
Ending balance	$	(20,172	)	$	(305	)	$	(20,477	)

Derivative Financial Instruments - Offsetting of Derivative Assets and Liabilities (Detail) - Zero Cost Collars [Member] - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Asset Derivatives:
Gross amounts of recognized assets		$ 3
Gross amounts offset in the balance sheets		0
Net amounts of liabilities presented in the balance sheets	$ 0	3
Gross amounts not offset in the balance sheets, Financial instruments		0
Gross amounts not offset in the balance sheets, Cash collateral pledged		0
Net amount		3
Liability Derivatives:
Gross amounts of recognized liabilities	5,170	1,770
Gross amounts offset in the balance sheets	0	0
Net amounts of liabilities presented in the balance sheets	5,170	1,770
Gross amounts not offset in the balance sheets, Financial instruments	0	0
Gross amounts not offset in the balance sheets, Cash collateral pledged	(4,970)	(1,200)
Net amount	$ 200	$ 570

Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Indefinite-Lived Intangible Assets [Line Items]
Amortization expense for intangible assets	$ 48	$ 72

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Accrued Expenses

3 Months Ended

Mar. 31, 2026

Payables and Accruals [Abstract]

Accrued Expenses

7. Accrued Expenses

Accrued expenses as of March 31, 2026 and December 31, 2025 are comprised of the following (in thousands):


	March 31, 2026		December 31, 2025
Payroll, benefits and related taxes, excluding severance benefits	$	4,331	$	4,999
Withholding tax attributable to intercompany interest income		111		7
Outside service fees		556		841
Others		492		1,082
Accrued expenses	$	5,490	$	6,929

Loss Per Share - Schedule of Computation of Basic and Diluted Loss Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Earnings Per Share, Basic [Abstract]
Loss from continuing operations	$ (4,697)	$ (4,051)
Income (Loss) from discontinued operations, net of tax	50	(4,827)
Net loss	$ (4,647)	$ (8,878)
Basic	36,407,581	36,887,841
Basic earnings (loss) per common share
Continuing operations	$ (0.13)	$ (0.11)
Discontinued operations	0	(0.13)
Basic earnings (loss) per common share	$ (0.13)	$ (0.24)
Diluted loss per common share
Net loss allocated to common stockholders	$ (4,647)	$ (8,878)
Basic weighted average common stock outstanding	36,407,581	36,887,841
Net effect of dilutive equity awards	0	0
Diluted weighted average common stock outstanding	36,407,581	36,887,841
Continuing operations	$ (0.13)	$ (0.11)
Discontinued operations	0	(0.13)
Diluted loss per common share	$ (0.13)	$ (0.24)

Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning	$ 248,250	$ 276,797
Total other comprehensive income (loss)	(11,443)	1,416
Balance ending	232,803	269,201
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning	(18,093)	(20,927)
Other comprehensive income (loss) before reclassifications	(7,975)	755
Amounts reclassified from accumulated other comprehensive loss	0	0
Total other comprehensive income (loss)	(7,975)	755
Balance ending	(26,068)	(20,172)
Derivative Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning	(715)	(966)
Other comprehensive income (loss) before reclassifications	(3,693)	136
Amounts reclassified from accumulated other comprehensive loss	225	525
Total other comprehensive income (loss)	(3,468)	661
Balance ending	(4,183)	(305)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning	(18,808)	(21,893)
Other comprehensive income (loss) before reclassifications	(11,668)	891
Amounts reclassified from accumulated other comprehensive loss	225	525
Total other comprehensive income (loss)	(11,443)	1,416
Balance ending	$ (30,251)	$ (20,477)

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

- Definition

Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

+ References

+ Details

Commitments and Contingencies

3 Months Ended

Mar. 31, 2026

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

17. Commitments and Contingencies

Advances to Suppliers

The Company, from time to time, may make advances in form of prepayments or deposits to suppliers, including external foundries, to meet its planned production. The Company recorded advances of $508 thousand and $512 thousand as other current assets as of March 31, 2026 and December 31, 2025, respectively.

Intangible Assets

3 Months Ended

Mar. 31, 2026

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

5. Intangible Assets

Intangible assets as of March 31, 2026 and December 31, 2025 are comprised of the following (in thousands):


	March 31, 2026
	Gross amount		Accumulated amortization			Net amount
Intellectual property assets	$	7,317	$	(6,913	)	$	404
Intangible assets	$	7,317	$	(6,913	)	$	404


	December 31, 2025
	Gross amount		Accumulated amortization			Net amount
Intellectual property assets	$	7,672	$	(7,218	)	$	454
Intangible assets	$	7,672	$	(7,218	)	$	454

Aggregate amortization expenses associated with continuing operations totaled $48 thousand and $72 thousand for the three months ended March 31, 2026 and 2025, respectively.

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Loss Contingencies [Line Items]
Prepayments to suppliers	$ 508	$ 512

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

Discontinued Operations (Tables)

3 Months Ended

Mar. 31, 2026

Discontinued Operations and Assets Held for Sale [Abstract]

Schedule of Results From Discontinued Operations

The following table summarizes the results from discontinued operations, net of tax, for the three months ended March 31, 2026 and 2025 (in thousands):


	Three Months Ended
	March 31, 2026			March 31, 2025
Net sales	$	1,646		$	9,556
Cost of sales		1,154			6,439
Gross profit		492			3,117
Operating expenses:
Selling, general and administrative expenses		108			1,543
Research and development expenses		133			6,281
Other charges		—			127
Total operating expenses		241			7,951
Operating income (loss) from discontinued operations		251			(4,834	)
Interest income		—			131
Interest expense		(14	)		(120	)
Foreign currency gain (loss), net		49			(4	)
Other income, net		8			—
Income (Loss) from discontinued operations before income tax expense, net		294			(4,827	)
Income tax expense, net		244			—
Income (Loss) from discontinued operations, net of tax	$	50		$	(4,827	)

Schedule Of Disposal Group Including Discontinued Operation Balance Sheet Disclosures

The following table presents the major classes of assets and liabilities of the discontinued operations that were included in the consolidated balance sheets (in thousands):


	March 31, 2026		December 31, 2025
Accounts receivable, net	$	1,572	$	2,689
Inventories, net		2,981		2,252
Accrued severance benefits, net		32		24

Schedule of Cash Flow Information Related to Discontinued Operation

The following table provides supplemental cash flows information related to discontinued operations (in thousands):


	Three Months Ended
	March 31, 2026		March 31, 2025
Significant non-cash operating activities:
Depreciation and amortization	$	5	$	153
Provision for severance benefits		10		207
Stock-based compensation		—		162
Investing activities:
Capital expenditures	$	—	$	—

Schedule Of Discontinued Operation Income Loss From Discontinued Operation Disclosures

The following table presents the revenue, gross profit and operating expenses related to the Company’s continuing involvement with the Discontinued Business for the period presented (in thousands):


	Three Months Ended March 31, 2026
Net sales	$	1,646
Gross profit		1,154
Operating expenses		247

- Definition

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-SubTopic 10
-Topic 360
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-3

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3A
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-3A

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3A
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-3A

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483475/205-20-45-11

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-3A

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-4A

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4B
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-URI https://asc.fasb.org/1943274/2147483499/205-20-50-4B

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-5A

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
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-Name Accounting Standards Codification
-Section 50
-Paragraph 5B
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-URI https://asc.fasb.org/1943274/2147483499/205-20-50-5B

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
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-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org/1943274/2147483499/205-20-50-5C

Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
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Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 13: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 360
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-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org/1943274/2147482099/360-10-50-3A

Reference 14: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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-URI https://asc.fasb.org/1943274/2147483499/205-20-50-1

Reference 15: http://fasb.org/us-gaap/role/ref/legacyRef
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+ Details

Foreign Currency Loss, Net - Additional Information (Detail) $ in Thousands	Mar. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)
Foreign Currency Transaction [Abstract]
Exchange rates using first base rate	1,513.4	1,434.9
Intercompany loan balances	$ 76,000	$ 75,063

CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Revenues:
Net sales	$ 46,208	$ 44,722
Cost of sales:
Cost of sales	39,014	35,360
Gross profit	7,194	9,362
Operating expenses:
Selling, general and administrative expenses	7,666	9,203
Research and development expenses	6,698	5,437
Total operating expenses	14,364	14,640
Operating loss	(7,170)	(5,278)
Interest income	1,063	1,540
Interest expense	(373)	(423)
Foreign currency loss, net	(115)	(405)
Other income (loss), net	(10)	114
Loss from continuing operations before income tax benefit, net	(6,605)	(4,452)
Income tax benefit, net	(1,908)	(401)
Loss from continuing operations	(4,697)	(4,051)
Income (Loss) from discontinued operations, net of tax	50	(4,827)
Net loss	$ (4,647)	$ (8,878)
Basic earnings (loss) per common share-
Continuing operations	$ (0.13)	$ (0.11)
Discontinued operations	0	(0.13)
Basic	(0.13)	(0.24)
Diluted earnings (loss) per common share-
Continuing operations	(0.13)	(0.11)
Discontinued operations	0	(0.13)
Diluted	$ (0.13)	$ (0.24)
Weighted average number of shares—
Basic	36,407,581	36,887,841
Diluted	36,407,581	36,887,841
Power Solutions Business [Member]
Revenues:
Net sales	$ 46,208	$ 44,722

Leases - Supplemental Balance Sheet (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Assets
Operating lease	$ 1,797	$ 2,070
Total lease assets	1,973	2,287
Current
Operating	1,344	1,427
Non-current
Operating	509	690
Total lease liabilities	2,065	2,375
Operating Lease Right Of Use Assets [Member]
Assets
Operating lease	1,797	2,070
Property, Plant and Equipment, Net [Member]
Assets
Finance lease	$ 176	$ 217
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Noncurrent	Other Assets, Noncurrent
Current Operating Lease Liabilities [Member]
Current
Operating	$ 1,344	$ 1,427
Other Current Liabilities [Member]
Current
Finance	$ 115	$ 130
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current	Other Liabilities, Current
Non Current Operating Lease Liabilities [Member]
Non-current
Operating	$ 509	$ 690
Other Noncurrent Liabilities [Member]
Non-current
Finance	$ 97	$ 128
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent

Loss Per Share (Tables)

3 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Loss Per Common Share

The following table illustrates the computation of basic and diluted loss per common share for the three months ended March 31, 2026 and 2025:


	Three Months Ended
	March 31, 2026			March 31, 2025
	(In thousands of U.S. dollars, except share data)
Basic loss per common share
Loss from continuing operations	$	(4,697	)	$	(4,051	)
Income (Loss) from discontinued operations, net of tax		50			(4,827	)
Net loss	$	(4,647	)	$	(8,878	)
Basic weighted average common stock outstanding		36,407,581			36,887,841
Basic earnings (loss) per common share
Continuing operations	$	(0.13	)	$	(0.11	)
Discontinued operations	$	0.00		$	(0.13	)
Total	$	(0.13	)	$	(0.24	)
Diluted loss per common share
Loss from continuing operations	$	(4,697	)	$	(4,051	)
Income (Loss) from discontinued operations, net of tax		50			(4,827	)
Net loss	$	(4,647	)	$	(8,878	)
Basic weighted average common stock outstanding		36,407,581			36,887,841
Net effect of dilutive equity awards		—			—
Diluted weighted average common stock outstanding		36,407,581			36,887,841
Diluted earnings (loss) per common share
Continuing operations	$	(0.13	)	$	(0.11	)
Discontinued operations	$	0.00		$	(0.13	)
Total	$	(0.13	)	$	(0.24	)

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 common share, as they have an anti-dilutive effect on the calculation:


	Three Months Ended
	March 31, 2026		March 31, 2025
Options		222,448		728,792
Restricted Stock Units		1,373,835		1,783,538

Geographic and Other Information - Additional Information (Detail) - Segments	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Revenues from External Customers and Long-Lived Assets [Line Items]
Segments	1
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]	srt:ChiefExecutiveOfficerMember
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description	The Chief Executive Officer, as the chief operating decision maker (“CODM”), organizes the Company and measures performance of two business lines of Power Analog Solutions and Power IC in the Power Solutions business at the level of revenue and gross profit margin by comparing actual results against previously forecasted targets.
Customer Concentration Risk [Member] \| Net Sales [Member] \| Top Ten Customers [Member] \| Power solutions business
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	73.40%	75.40%
Customer Concentration Risk [Member] \| Net Sales [Member] \| Top Customer One [Member] \| Power solutions business
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	31.00%	32.90%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Top Customer One [Member] \| Power solutions business
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	40.60%		35.40%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Top Customer Two [Member] \| Power solutions business
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	14.60%		15.70%
Geographic Concentration Risk [Member] \| Net Sales [Member] \| Taiwan [Member] \| Power solutions business
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	11.00%	11.30%
Geographic Concentration Risk [Member] \| Net Sales [Member] \| Greater China (China and Hong Kong) [Member] \| Power solutions business
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	83.80%	83.10%

Leases - Aggregate Future Lease Payment (Detail) $ in Thousands	Mar. 31, 2026 USD ($)
Leases [Abstract]
Operating Leases, Remainder of 2026	$ 1,114
Operating Leases, 2027	749
Operating Leases, 2028	68
Operating Leases, 2029	1
Operating Leases, Total future lease payments	1,932
Less: Imported interest	(79)
Present value of future payments	1,853
Finance Leases [Abstract]
Finance Leases, Remainder of 2026	100
Finance Leases, 2027	104
Finance Leases, 2028	21
Finance Leases, 2029	2
Finance Leases, Total future lease payments	227
Less: Present value adjustment	$ (15)
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current
Present value of future payments	$ 212

Geographic and Other Information (Tables)

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

Schedule of Operating Segments

The following sets forth information relating to the operating segment, Power Solutions business (in thousands). For financial information below gross profit, including operating income and expenses as well as other income and expenses, please refer to the Company’s consolidated statements of operations.


	Three Months Ended
	March 31, 2026		March 31, 2025
Net Sales
Power Solutions business
Power Analog Solutions	$	41,647	$	39,857
Power IC		4,561		4,865
Total Power Solutions business		46,208		44,722
Total Net Sales	$	46,208	$	44,722


	Three Months Ended
	March 31, 2026		March 31, 2025
Cost of Sales
Power Solutions business
Power Analog Solutions	$	36,296	$	32,757
Power IC		2,718		2,603
Total Power Solutions business		39,014		35,360
Total cost of sales	$	39,014	$	35,360


	Three Months Ended
	March 31, 2026		March 31, 2025
Gross Profit
Power Solutions business
Power Analog Solutions	$	5,351	$	7,100
Power IC		1,843		2,262
Total Power Solutions business		7,194		9,362
Total gross profit	$	7,194	$	9,362

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):


	Three Months Ended
	March 31, 2026		March 31, 2025
Korea	$	20,666	$	21,716
Asia Pacific (other than Korea)		23,587		20,992
United States		1,239		1,182
Europe		716		832
Total	$	46,208	$	44,722

Accrued Severance Benefits

3 Months Ended

Mar. 31, 2026

Postemployment Benefits [Abstract]

Accrued Severance Benefits

10. Accrued Severance Benefits

The majority of accrued severance benefits are for employees in the Company’s Korean subsidiaries. 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 March 31, 2026, 97% of all employees of the Company were eligible for severance benefits.

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


	Three Months Ended
	March 31, 2026			March 31, 2025
Beginning balance	$	37,060		$	45,594
Provisions		1,212			1,514
Severance payments		(228	)		(325	)
Translation adjustments		(1,950	)		103
		36,094			46,886
Less: Cumulative contributions to severance insurance deposit accounts		(24,419	)		(28,821	)
The National Pension Fund		(15	)		(24	)
Accrued severance benefits, net	$	11,660		$	18,041

The severance benefits funded through the Company’s National Pension Fund have been and 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 contributes 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 pursuant to Employee Retirement Benefit Security Act of Korea. 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
2027	$	379
2028	$	—
2029	$	1,683
2030	$	2,113
2031	$	3,092
2032 – 2037	$	17,093

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 years of age or older under the Employment Promotion for the Aged Act. The Company sets the retirement age of employees at 60.

Inventories - Changes in Inventory Reserve (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Changes In Inventory Reserve [Abstract]
Beginning balance	$ (6,834)	$ (7,732)
Change in reserve
Inventory reserve charged to costs of sales	(1,161)	(2,299)
Sale of previously reserved inventory	1,455	1,268
Change in reserve	294	(1,031)
Write off	20	197
Translation adjustments	377	(188)
Ending balance	$ (6,143)	$ (8,754)

CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Current assets
Cash and cash equivalents	$ 94,554	$ 103,756
Accounts receivable, net	24,176	26,022
Inventories, net	32,848	34,151
Other receivables	4,203	2,882
Prepaid expenses	5,591	5,062
Hedge collateral (Note 8)	4,970	1,200
Other current assets (Note 17)	3,681	3,782
Total current assets	170,023	176,855
Property, plant and equipment, net	95,072	100,204
Operating lease right-of-use assets	1,797	2,070
Intangible assets, net	404	454
Long-term prepaid expenses, net	531	584
Deferred income taxes	61,222	64,248
Other non-current assets	6,416	7,114
Total assets	335,465	351,529
Current liabilities
Accounts payable	21,330	20,848
Other accounts payable	10,813	11,444
Accrued expenses (Note 7)	5,490	6,929
Accrued income taxes	45	81
Operating lease liabilities	1,344	1,427
Current portion of long-term borrowings (Note 11)	26,431	0
Other current liabilities	6,264	2,681
Total current liabilities	71,717	43,410
Long-term borrowings (Note 11)	15,855	44,599
Accrued severance benefits, net	11,660	11,502
Non-current operating lease liabilities	509	690
Other non-current liabilities	2,921	3,078
Total liabilities	102,662	103,279
Commitments and contingencies (Note 17)
Stockholders' equity
Common stock, $0.01 par value, 150,000,000 shares authorized, 58,249,450 shares issued and 36,440,854 outstanding at March 31, 2026 and 58,027,696 shares issued and 36,219,100 outstanding at December 31, 2025	581	579
Additional paid-in capital	282,178	281,537
Retained earnings	210,205	214,852
Treasury stock, 21,808,596 shares at March, 31, 2026 and 21,808,596 shares at December 31, 2025, respectively	(229,910)	(229,910)
Accumulated other comprehensive loss	(30,251)	(18,808)
Total stockholders' equity	232,803	248,250
Total liabilities and stockholders' equity	$ 335,465	$ 351,529

Accounts Receivable - Schedule of Accounts Receivable (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Receivables [Abstract]
Accounts receivable, net	$ 24,176	$ 26,022

Geographic and Other Information

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

Geographic and Other Information

14. Geographic and Other Information

The Company operates within a single operating segment, Power Solutions business, which consists of the Power Analog Solutions and Power IC businesses.

The Chief Executive Officer, as the chief operating decision maker (“CODM”), organizes the Company and measures performance of two business lines of Power Analog Solutions and Power IC in the Power Solutions business at the level of revenue and gross profit margin by comparing actual results against previously forecasted targets.

The Company’s CODM does not evaluate the performance of each business line using any other information, such as asset or liability.


	Three Months Ended
	March 31, 2026		March 31, 2025
Net Sales
Power Solutions business
Power Analog Solutions	$	41,647	$	39,857
Power IC		4,561		4,865
Total Power Solutions business		46,208		44,722
Total Net Sales	$	46,208	$	44,722


	Three Months Ended
	March 31, 2026		March 31, 2025
Cost of Sales
Power Solutions business
Power Analog Solutions	$	36,296	$	32,757
Power IC		2,718		2,603
Total Power Solutions business		39,014		35,360
Total cost of sales	$	39,014	$	35,360


	Three Months Ended
	March 31, 2026		March 31, 2025
Gross Profit
Power Solutions business
Power Analog Solutions	$	5,351	$	7,100
Power IC		1,843		2,262
Total Power Solutions business		7,194		9,362
Total gross profit	$	7,194	$	9,362

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


	Three Months Ended
	March 31, 2026		March 31, 2025
Korea	$	20,666	$	21,716
Asia Pacific (other than Korea)		23,587		20,992
United States		1,239		1,182
Europe		716		832
Total	$	46,208	$	44,722

For the three months ended March 31, 2026 and 2025, of the Company’s net sales in Asia Pacific (other than Korea), net sales in China and Hong Kong together represented 83.8% and 83.1%, respectively, and net sales in Taiwan represented 11.0% and 11.3%, respectively.

Net sales from the Company’s top ten largest customers accounted for 73.4% and 75.4% for the three months ended March 31, 2026 and 2025, respectively.

For the three months ended March 31, 2026, the Company had one customer that represented 31.0% of net sales. For the three months ended March 31, 2025, the Company had one customer that represented 32.9% of net sales.

As of March 31, 2026, two customers accounted for 40.6% and 14.6% of the Company’s accounts receivable, respectively. As of December 31, 2025, two customers accounted for 35.4% and 15.7% of the Company’s accounts receivable, respectively.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-21

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-21

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-31

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-15

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-42

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 48
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-48

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (f)
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-Topic 270
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-Section 50
-Paragraph 1
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+ Details

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 31, 2026
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Property, Plant and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Property, Plant and Equipment [Line Items]
Depreciation expenses	$ 2,829	$ 3,048

Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Carrying Value [Member]
Assets:
Derivative assets		$ 3
Liabilities:
Derivative liabilities, current	$ 4,712	1,644
Derivative liabilities, Non-current	458	126
Estimate of Fair Value Measurement [Member]
Assets:
Derivative assets		$ 3
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other Assets, Current
Liabilities:
Derivative liabilities, current	4,712	$ 1,644
Derivative liabilities, Non-current	$ 458	$ 126
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current	Other Liabilities, Current
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Derivative assets		$ 3
Liabilities:
Derivative liabilities, current	$ 4,712	1,644
Derivative liabilities, Non-current	$ 458	$ 126

Business, Basis of Presentation and Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2026
Accounting Policies [Abstract]
Business	Business Magnachip Semiconductor Corporation (together with its subsidiaries, the “Company”) is a designer and manufacturer of analog and mixed-signal power semiconductor platform solutions for various applications, including industrial, automotive, communication, consumer and computing. The Company develops and manufactures Power discrete (“Power Analog Solutions”) products and develops Power integrated circuit (“IC”) products. Power Analog Solutions products include metal oxide semiconductor field effect transistors (“MOSFETs”) and insulated-gate bipolar transistors (“IGBTs”) for a range of devices, including televisions, smartphones, mobile phones, wearable devices, desktop personal computers (“PCs”), notebook PCs, tablet PCs, home appliance, other consumer electronics, automotive and industrial applications such as power suppliers, e-bikes, photovoltaic inverters, LED lighting and motor drives. Power IC products include AC-DC/DC-DC converters, LED drivers, regulators, power management integrated circuits (“PMICs”) and level shifter for a range of devices, including televisions, wearable devices, notebooks, tablet PCs and other consumer electronics, as well as automotive applications. In 2024, the Power IC business was operated by Magnachip Mixed-Signal, Ltd. (“MMS”), which later transferred the business to Magnachip Semiconductor, Ltd. (“MSK”) effective January 1, 2025, pursuant to an intercompany business transfer agreement executed between MMS and MSK. The transfer was based on the mutual understanding that consolidating the Power Analog Solutions and Power IC businesses under a single company would create a more effective framework for expanding and strengthening the Company’s business for Power products.
Basis of Presentation	Basis of Presentation The accompanying unaudited interim consolidated financial statements of the Company have been prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”). These interim consolidated financial statements include normal recurring adjustments and the elimination of all intercompany accounts and transactions which are, in the opinion of management, necessary to provide a fair statement of the Company’s financial condition and results of operations for the periods presented. These interim consolidated financial statements are presented in accordance with Accounting Standards Codification (“ASC”) 270, “Interim Reporting” and, accordingly, do not include all of the information and note disclosures required by U.S. GAAP for complete financial statements. The December 31, 2025 balance sheet data was derived from the Company’s audited financial statements, but does not include all disclosures required by U.S. GAAP. The interim consolidated financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2025. There have been no material changes to the Company’s significant accounting policies as of and for the three months ended March 31, 2026 as compared to the significant accounting policies described in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2025.
Recent Accounting Pronouncements Not Yet Adopted	Recent Accounting Pronouncements Not Yet Adopted In November 2024, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2024-03, “Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses” (“ASU 2024-03”). Additionally, in January 2025, the FASB issued ASU 2025-01 to clarify the effective date of ASU 2024-03. ASU 2024-03 requires public companies to disclose, in the notes to the financial statements, specific information about certain costs and expenses at each interim and annual reporting period. This includes disclosing amounts related to purchases of inventory, employee compensation, depreciation, and intangible asset amortization. In addition, public companies will need to provide qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively. ASU 2024-03 is effective for public business entities for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption is permitted and the amendments in this update may be applied prospectively or retrospectively. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements and related disclosures.

Cover Page - shares	3 Months Ended
Cover Page - shares	Mar. 31, 2026	Apr. 30, 2026
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2026
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q1
Document Transition Report	false
Entity File Number	001-34791
Entity Registrant Name	Magnachip Semiconductor Corporation
Entity Central Index Key	0001325702
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	83-0406195
Entity Address, Address Line One	c/o Magnachip Semiconductor, Ltd.
Entity Address, Address Line Two	15F, 76 Jikji-daero 436beon-gil
Entity Address, City or Town	Heungdeok-gu
Entity Address, Country	KR
Entity Address, Postal Zip Code	28581
City Area Code	82
Local Phone Number	(2) 6903-3000
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	MX
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		36,440,854

Borrowings - Schedule of Borrowings (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Total borrowings	$ 42,286	$ 44,599
Less: current portion of long-term borrowings	(26,431)	0
Long-term borrowings	15,855	44,599
Term Loan due March 2027 [Member]
Debt Instrument [Line Items]
Total borrowings	26,431	27,877
CAPEX Loans due June 2035 [Member]
Debt Instrument [Line Items]
Total borrowings	$ 15,855	$ 16,722

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Discontinued Operations - Schedule Of Disposal Group Including Discontinued Operation Balance Sheet Disclosures (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Accounts receivable, net	$ 1,572	$ 2,689
Inventories, net	2,981	2,252
Accrued severance benefits, net	$ 32	$ 24

Borrowings - Additional Information (Detail) $ in Thousands	Dec. 31, 2025 KRW (₩)	Mar. 26, 2024 KRW (₩)	Mar. 31, 2026 USD ($)	Dec. 30, 2025 KRW (₩)	Sep. 26, 2025 KRW (₩)	Jun. 26, 2025 KRW (₩)	Dec. 16, 2024 KRW (₩)	Dec. 16, 2024 USD ($)	Mar. 26, 2024 USD ($)
Schedule of Capitalization, Long-Term Debt [Line Items]
Loan, Held-in-Portfolio, Principal Outstanding, Total			$ 26,431
Debt instrument, basis spread on variable rate			4.06%
Foreign currency exchange rate, translation	1,434.9		1,513.4
Capex Loans [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Loan, Held-in-Portfolio, Principal Outstanding, Total			$ 15,855
Debt Instrument, Maturity Date	Jun. 26, 2035
Debt instrument, interest rate, effective percentage			2.91%
Capex Loans [Member] \| Korea (South), Won
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt instrument, face Amount \| ₩	₩ 23,995,000,000			₩ 9,400,000,000	₩ 5,075,000,000	₩ 9,520,000,000	₩ 38,000,000,000
Working Capital Term Loan [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Maturity Date		Mar. 26, 2027
Debt instrument, interest rate, effective percentage		4.86%							4.86%
Foreign currency exchange rate, translation		1,340.7	1,513.4				1,432.7	1,432.7	1,340.7
Debt instrument, face Amount			$ 15,855					$ 26,523	$ 29,835
Working Capital Term Loan [Member] \| Korea (South), Won
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt instrument, basis spread on variable rate		1.21%
Debt instrument, face Amount \| ₩		₩ 40,000,000,000

Inventories

3 Months Ended

Mar. 31, 2026

Inventory Disclosure [Abstract]

Inventories

3. Inventories

Inventories as of March 31, 2026 and December 31, 2025 consist of the following (in thousands):


	March 31, 2026			December 31, 2025
Finished goods	$	8,310		$	7,542
Semi-finished goods and work-in-process		26,447			29,245
Raw materials		4,169			4,198
Materials in-transit		65			—
Less: inventory reserve		(6,143	)		(6,834	)
Inventories, net	$	32,848		$	34,151

Changes in inventory reserve for the three months ended March 31, 2026 and 2025 are as follows (in thousands):


	Three Months Ended
	March 31, 2026			March 31, 2025
Beginning balance	$	(6,834	)	$	(7,732	)
Change in reserve
Inventory reserve charged to costs of sales		(1,161	)		(2,299	)
Sale of previously reserved inventory		1,455			1,268
		294			(1,031	)
Write off		20			197
Translation adjustments		377			(188	)
Ending balance	$	(6,143	)	$	(8,754	)

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.

Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	$ 3,812
Zero Cost Collar and Forward Contracts [Member] \| Nomura Financial Investment (Korea) Co., Ltd. [Member]
Derivative [Line Items]
Threshold amount of cash collateral	500
Threshold amount of additional cash collateral	4,970	$ 1,200
Termination provisions for cash and cash equivalents	$ 30,000

Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Finite-Lived Intangible Assets [Line Items]
Intangible asset, Gross amount	$ 7,317	$ 7,672
Accumulated amortization	(6,913)	(7,218)
Intangible asset, Net amount	404	454
Intellectual Property Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset, Gross amount	7,317	7,672
Accumulated amortization	(6,913)	(7,218)
Intangible asset, Net amount	$ 404	$ 454

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Borrowings - Summary Of Principal Repayments (Details) - Capex Loans [Member] $ in Thousands	Mar. 31, 2026 USD ($)
Long Term Debt Maturities Repayments Of Principal
Remainder of 2026	$ 0
2027	991
2028	1,982
2029	1,982
2030	1,982
2031 - 2035	$ 8,918

Income Taxes

3 Months Ended

Mar. 31, 2026

Income Tax Disclosure [Abstract]

Income Taxes

13. Income Taxes

The Company and its subsidiaries file income tax returns in Korea, Japan, Taiwan, the U.S. 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.

For the three months ended March 31, 2026 and 2025, the Company recorded income tax benefits of $1,908 thousand and $401 thousand, respectively, primarily related to its primary operating entity in Korea, based on the estimated taxable loss for each respective period.

- Definition

The entire disclosure for income tax.

+ References

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+ Details

Property, Plant and Equipment

3 Months Ended

Mar. 31, 2026

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

4. Property, Plant and Equipment

Property, plant and equipment as of March 31, 2026 and December 31, 2025 are comprised of the following (in thousands):


	March 31, 2026			December 31, 2025
Buildings and related structures	$	23,143		$	24,371
Machinery and equipment		128,225			137,024
Finance lease right-of-use assets		470			495
Others		27,889			32,342
		179,727			194,232
Less: accumulated depreciation		(119,380	)		(128,171	)
Land		11,073			11,679
Construction in progress		23,652			22,464
Property, plant and equipment, net	$	95,072		$	100,204

Aggregate depreciation expenses associated with continuing operations totaled $2,829 thousand and $3,048 thousand for the three months ended March 31, 2026 and 2025, respectively.

Pledge Agreement

On December 16, 2024, MSK executed a Standard Credit Agreement (as amended) (together with its General Terms and Conditions, the “Equipment Financing Credit Agreement”) with KDB. In connection with the Equipment Financing Credit Agreement, on December 8, 2024, MSK amended the Kun-Pledge Agreement (the “Equipment Pledge Agreement”) with KDB, originally executed on or about March 26, 2024, to increase the maximum secured amount and to expand the scope of collateral to include certain machinery and equipment owned by MSK, which are located in its fabrication facility in Gumi, Korea.

See “Note 11. Borrowings” to these consolidated financial statements below for more information regarding the Loan Agreement and Equipment Financing Credit Agreement.

Business, Basis of Presentation and Significant Accounting Policies (Additional Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Percentage of employees eligible for severance benefits	97.00%
Selling, general and administrative expenses	$ 7,666	$ 9,203

- Definition

The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

+ References + Details

Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2026

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of intangible assets

Intangible assets as of March 31, 2026 and December 31, 2025 are comprised of the following (in thousands):


	March 31, 2026
	Gross amount		Accumulated amortization			Net amount
Intellectual property assets	$	7,317	$	(6,913	)	$	404
Intangible assets	$	7,317	$	(6,913	)	$	404


	December 31, 2025
	Gross amount		Accumulated amortization			Net amount
Intellectual property assets	$	7,672	$	(7,218	)	$	454
Intangible assets	$	7,672	$	(7,218	)	$	454

Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2026

Property, Plant and Equipment [Abstract]

Summary of Property, Plant and Equipment

Property, plant and equipment as of March 31, 2026 and December 31, 2025 are comprised of the following (in thousands):


	March 31, 2026			December 31, 2025
Buildings and related structures	$	23,143		$	24,371
Machinery and equipment		128,225			137,024
Finance lease right-of-use assets		470			495
Others		27,889			32,342
		179,727			194,232
Less: accumulated depreciation		(119,380	)		(128,171	)
Land		11,073			11,679
Construction in progress		23,652			22,464
Property, plant and equipment, net	$	95,072		$	100,204

Leases - Other Lease Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 358	$ 622
Operating cash flows from finance leases	4	7
Financing cash flows from finance leases	$ 34	$ 38
Weighted average remaining lease term
Operating leases	1 year 4 months 24 days		1 year 6 months
Finance leases	1 year 10 months 24 days		2 years 1 month 6 days
Weighted average discount rate
Operating leases	6.00%		6.50%
Finance leases	7.00%		7.00%