Accounting Policies [Abstract] Accounting Policies [Abstract] Accounting Standards Update 2014-09 [Member] Accounting Standards Update 2014-09 [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Receivable Type [Axis] Receivable Type [Axis] Accounts Payable and Accrued Liabilities Disclosure [Text Block] Accrued Expenses Accounts Payable, Other, Current Other accounts payable Accounts Payable, Trade, Current Accounts payable Accounts Receivable, Gross Accounts receivable Accounts Receivable, Net, Current Accounts receivable, net Accounts receivable, net Accrued Liabilities, Current Accrued expenses Accrued expenses Accrued Liabilities Current [Member] Accrued Liabilities Current [Member] Accrued Expense [Member] Accrued Liabilities [Table] Accrued Liabilities [Table] Accrued Liabilities [Table] Accrued Outside Service Fees Current Accrued Outside Service Fees Current Outside service fees Accrued Severance And Pension Liabilities Policy [Text Block] Accrued Severance And Pension Liabilities [Policy Text Block] Accrued Severance Benefits Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Less: accumulated depreciation Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Derivative Adjustments [Member] Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax Derivative adjustments Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Foreign currency translation adjustments Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income (loss) Total Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Foreign Currency Translation Adjustments [Member] Additional Cash and Cash Equivalent Related Text Cash equivalents, highly liquid investments original maturity date Additional Paid in Capital, Common Stock Additional paid-in capital Additional Paid-in Capital [Member] Additional Paid-In Capital [Member] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock-based compensation Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash provided by (used in) operating activities Advances to suppliers. Advances To Suppliers Policy Text Block] Advances to Suppliers Advertising Costs, Policy [Policy Text Block] Advertising Advertising Expense Advertising expense Allocated Share-based Compensation Expense Allocated share based compensation expense Allowance for Doubtful Accounts [Member] Allowance for Doubtful Accounts [Member] Allowance for Doubtful Accounts Receivable Allowances for doubtful accounts Ending balance Beginning balance Allowance For Doubtful Accounts Receivable Translation Adjustment Allowance For Doubtful Accounts Receivable Translation Adjustment Translation adjustments Allowance For Sales Returns Allowance For Sales Returns Sales return reserves Ending balance Beginning balance Allowance for Sales Returns [Member] Sales Return Reserve [Member] Allowance for sales returns translation adjustments. Allowance For Sales Returns Translation Adjustments Translation adjustments Allowance for sales returns write offs. Allowance For Sales Returns Write Offs Usage Amendment Flag Amendment Flag Amortization of Debt Issuance Costs and Discounts Amortization of debt issuance costs and original issue discount Amortization of Intangible Assets Amortization expense for intangible assets Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Outstanding units and warrants excluded from computation of diluted loss per share/unit Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Asia Pacific Other Than Korea [Member] Asia Pacific Other Than Korea [Member] Asia Pacific (Other Than Korea) [Member] Assets Total assets Assets [Abstract] Assets Assets, Current Total current assets Assets, Current [Abstract] Current assets Assets, Fair Value Disclosure, Nonrecurring Assets fair value on non-recurring basis Award Type [Axis] Award Type [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Basis of Accounting, Policy [Policy Text Block] Basis of Presentation Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] Basis Of Presentation And Summary Of Significant Accounting Policies [Table] Basis Of Presentation And Summary Of Significant Accounting Policies [Table] Basis Of Presentation And Summary Of Significant Accounting Policies [Table] Building and Building Improvements [Member] Buildings and Related Structures [Member] Building [Member] Buildings [Member] Business [Member] Business [Member] Sensor Business [Member] Capital Expenditures Incurred but Not yet Paid Property, plant and equipment additions in other accounts payable Reported Value Measurement [Member] Carrying Value [Member] Cash and Cash Equivalents, at Carrying Value End of the period Beginning of the period Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value [Abstract] Cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents Cash collateral for covering credit exposure in derivatives. Cash Collateral for Covering Credit Exposure In Derivatives Cash collateral for credit exposure in derivatives Cash Flow Hedging [Member] Cash Flow Hedging [Member] Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Non-cash investing and financing activities Changes In Inventory Reserves Table [Text Block] Changes In Inventory Reserves [Table Text Block] Changes in Inventory Reserve Class Action Complaint [Member] Class Action Complaint [Member] Securities Class Action Complaints [Member] Class of Stock [Line Items] Class of Stock [Line Items] Commitments and Contingencies Commitments and contingencies (Note 19) Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Common Stock [Member] Common Stock [Member] Common Stock Outstanding [Member] Common Stock Outstanding [Member] Common Stock Outstanding [Member] Common Stock, Par or Stated Value Per Share Common stock, par value Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Issued Common stock, shares issued Common Stock, Shares, Outstanding Balance, Shares ending Balance, Shares beginning Common stock, shares outstanding Common Stock, Value, Issued Common stock, $0.01 par value, 150,000,000 shares authorized, 42,563,808 shares issued and 34,189,599 outstanding at December 31, 2017 and 41,627,103 shares issued and 35,048,338 outstanding at December 31, 2016 Retirement Benefits [Abstract] Retirement Benefits [Abstract] Compensation Related Costs, Policy [Policy Text Block] Recently Adopted Accounting Pronouncements - Improvements to Employee Share-Based Payment Accounting Comprehensive Income (Loss), Net of Tax, Attributable to Parent Total comprehensive income (loss) Comprehensive Income (Loss) Note [Text Block] Accumulated Other Comprehensive Income (Loss) Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk, Credit Risk, Policy [Policy Text Block] Concentration of Credit Risk Concentration Risk, Percentage Concentration risk, percentage Concentration Risk Type [Domain] Concentration Risk Type [Domain] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Consolidation, Policy [Policy Text Block] Principles of Consolidation Cost of Revenue Cost of sales Cost of Sales, Vendor Allowances, Policy [Policy Text Block] Vendor Rebates Costs Associated with Exit or Disposal Activities or Restructurings, Policy [Policy Text Block] Restructuring Charges Counterparty Name [Axis] Counterparty Name [Axis] Cumulative contributions to national pension fund. Cumulative Contributions To National Pension Fund Less: Cumulative contributions to the National Pension Fund Current Federal Tax Expense (Benefit) Domestic Current Fiscal Year End Date Current Fiscal Year End Date Current Foreign Tax Expense (Benefit) Foreign Current Income Tax Expense (Benefit) Current income taxes expense Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Current income taxes expense (benefit) Customer Concentration Risk [Member] Customer Concentration Risk [Member] Customer Relationships [Member] Customer Relationships [Member] Debt Conversion, Converted Instrument, Shares Issued Conversion of converted notes, shares issued Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument [Axis] Debt Instrument [Axis] Long-term Debt, Gross Long-term borrowings Debt Instrument, Convertible, Conversion Price Exchange price Debt instrument convertible conversion price denomination value. Debt Instrument Convertible Conversion Price Denomination Value Convertible notes principal amount denomination value Debt Instrument, Face Amount Aggregate principal amount Debt Instrument, Fair Value Disclosure [Abstract] Long-term Borrowings: Debt Instrument, Interest Rate, Effective Percentage Conversion of exchangeable notes to common stock rate Interest rate Debt Instrument [Line Items] Debt Instrument [Line Items] Debt Instrument, Maturity Date Due date Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Senior notes pricing. Debt Instrument Pricing Aggregate principal amount of senior notes pricing Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period One [Member] 2017 [Member] Debt Instrument, Redemption, Period Three [Member] 2019 [Member] Debt Instrument, Redemption, Period Two [Member] 2018 [Member] Debt Instrument, Redemption Price, Percentage Redemption price plus accrued, unpaid interest and special interest to the date of redemption Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Debt Instrument, Unamortized Discount Original debt issue discount Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Less: unamortized discount and debt issuance costs Decrease in Restricted Cash Decrease in restricted cash due to release Deferred Foreign Income Tax Expense (Benefit) Foreign Deferred Income Taxes and Other Assets [Abstract] Reported as Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Deferred income taxes expense (benefit) Deferred Tax Liabilities, Gross Total deferred tax liabilities Deferred Revenue, Current Deferred revenue Recorded deferred revenue Deferred Tax Assets, Derivative Instruments Derivative assets Deferred Tax Assets, Goodwill and Intangible Assets Intangible assets Deferred Tax Assets, Gross Total deferred tax assets Deferred Tax Assets, Inventory Inventory reserves Deferred Tax Assets, Net Net deferred tax assets Net deferred tax assets Deferred Tax Assets, Net, Current Current deferred income tax assets Deferred Tax Assets, Net, Noncurrent Deferred income tax assets Non-current deferred income tax assets Deferred Tax Assets Long Term Debt Deferred Tax Assets Long Term Debt Other long-term payable Deferred Tax Assets, Net of Valuation Allowance Deferred tax assets, net Deferred Tax Assets, Net [Abstract] Deferred tax assets Deferred Tax Assets, Operating Loss Carryforwards NOL carry-forwards Deferred Tax Assets, Other Others Deferred Tax Assets, Property, Plant and Equipment Property, plant and equipment Deferred Tax Assets, Tax Credit Carryforwards Tax credit Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Severance Payments Accumulated severance benefits Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Accrued expenses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other Other reserves Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves Product warranties Deferred Tax Assets, Unrealized Currency Losses Foreign currency translation losses Deferred Tax Assets, Valuation Allowance Ending balance Beginning balance Deferred tax assets, valuation allowance amount Less: Valuation allowance Deferred tax assets valuation allowance charged to expense income. Deferred Tax Assets Valuation Allowance Charged to Expense Income Charged to expense Deferred tax assets valuation allowance foreign currency translation adjustment. Deferred Tax Assets Valuation Allowance Foreign Currency Translation Adjustment Translation adjustments Deferred Tax Assets Valuation Allowances On Net Operating Loss and Tax Credit Expiration Deferred Tax Assets Valuation Allowances On Net Operating Loss and Tax Credit Expiration NOL/tax credit claimed/expired Deferred Tax Liabilities, Net, Current Current deferred income tax liabilities Deferred Tax Liabilities, Derivatives Derivative liabilities Deferred Tax Liabilities, Net [Abstract] Deferred tax liabilities Deferred Tax Liabilities, Net, Noncurrent Non-current deferred income tax liabilities Deferred Tax Liabilities, Other Others Deferred Tax Liabilities, Prepaid Expenses Prepaid expense Deferred Tax Liabilities, Unrealized Currency Transaction Gains Foreign currency translation gains Defined Benefit Plan Employee Retirement Age Defined Benefit Plan Employee Retirement Age Retirement age of employees Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter 2023 - 2027 Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 2018 Defined Benefit Plan, Expected Future Benefit Payment, Year Five 2022 Defined Benefit Plan, Expected Future Benefit Payment, Year Four 2021 Defined Benefit Plan, Expected Future Benefit Payment, Year Three 2020 Defined Benefit Plan, Expected Future Benefit Payment, Year Two 2019 Deposit Liability, Current Deposits received Deposits received (Note 14) Depreciation Depreciation expenses Depreciation, Depletion and Amortization Depreciation and amortization Derivative Asset, Collateral, Obligation to Return Cash, Offset Asset Derivatives, Gross amounts offset in the balance sheets Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract] Asset Derivatives: Derivative Asset Derivative assets Asset Derivatives, Net amounts of assets presented in the balance sheets Derivatives designated as hedging instruments, Asset Derivative, Collateral, Obligation to Return Cash Asset Derivatives, Gross amounts not offset in the balance sheets, Cash collateral pledged Derivative, Collateral, Obligation to Return Securities Asset Derivatives, Gross amounts not offset in the balance sheets, Financial instruments Derivative, Collateral, Right to Reclaim Cash Liability Derivatives, Gross amounts not offset in the balance sheets, Cash collateral pledged Derivative, Collateral, Right to Reclaim Securities Liability Derivatives, Gross amounts not offset in the balance sheets, Financial instruments Derivative Contract [Domain] Derivative Contract [Domain] Derivative, Fair Value, Amount Offset Against Collateral, Net Liability Derivatives, Net amount after master netting Derivative Asset, Fair Value, Amount Not Offset Against Collateral Asset Derivatives, Gross amounts of recognized assets Derivative Asset, Fair Value, Amount Offset Against Collateral Asset Derivatives, Net amount Derivative Liability, Fair Value, Amount Not Offset Against Collateral Liability Derivatives, Gross amounts of recognized liabilities Derivative, Inception Date Date of transaction Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivative Financial Instruments Hedging Relationship [Axis] Hedging Relationship [Axis] Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred Estimated amount reclassified from accumulated other comprehensive income into income