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[Axis] Plan Name [Axis] Plan Name [Axis] Tabular List, Table Tabular List [Table Text Block] Restricted cash included in other long-term assets Restricted Cash and Cash Equivalent, Noncurrent Other Other Nonoperating Income (Expense) Schedule of Stock-Based Compensation Expense Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Adjustment to Compensation: Adjustment to Compensation [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Total Assets, Fair Value Disclosure Name Measure Name INCOME TAXES Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Other Other Noncash Income (Expense) Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Entity Filer Category Entity Filer Category Directors Director [Member] Short-term investments Short-Term Investments Amended and Restated 2014 Plan Amended and Restated 2014 Plan [Member] Amended and Restated 2014 Plan Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Raw materials Inventory, Raw Materials, Net of Reserves Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Depreciation and amortization Depreciation, Depletion and Amortization Current assets: Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Income tax expense Income Tax Expense (Benefit) Customer concentration risk Customer Concentration Risk [Member] Total Purchase Obligation Award Timing Method Award Timing Method [Text Block] Net increase (decrease) in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] South Korea KOREA, REPUBLIC OF Research and development Research and Development Expense (Excluding Acquired in Process Cost) Net income Net income Net income Net Income (Loss) Attributable to Parent Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Location, Statement of Financial Position, Balance [Axis] Location, Statement of Financial Position, Balance [Axis] Certificates of deposit Cash Equivalent, Certificate of Deposit, Carrying Value Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Certificates of deposit Certificates of Deposit [Member] Accounts receivable Increase (Decrease) in Receivables Price per share payable upon vesting (in dollars per share) Share Based Compensation Arrangement By Share Based Payment Award Price Per Share Payable Upon Vesting Of Equity Instruments Other Than Options Share Based Compensation Arrangement By Share Based Payment Award Price Per Share Payable Upon Vesting Of Equity Instruments Other Than Options Japan JAPAN Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]