Risks and Uncertainties [Abstract] Schedules of Concentration of Risk, by Risk Factor Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Retirement Benefits [Abstract] Employee Benefit Plans Compensation and Employee Benefit Plans [Text Block] Restrictions for Consolidated and Unconsolidated Subsidiaries [Abstract] Restricted Net Assets Restricted Assets Disclosure [Text Block] Income Tax Disclosure [Abstract] Provision for (benefit from) income taxes Income Tax Expense (Benefit), Continuing Operations, by Jurisdiction [Abstract] U.S. federal taxes: Federal Income Tax Expense (Benefit), Continuing Operations [Abstract] Current Current Federal Tax Expense (Benefit) Deferred Deferred Federal Income Tax Expense (Benefit) Non-U.S. taxes: Foreign Income Tax Expense (Benefit), Continuing Operations [Abstract] Current Current Foreign Tax Expense (Benefit) Deferred Deferred Foreign Income Tax Expense (Benefit) State taxes, net of federal benefit: State and Local Income Tax Expense (Benefit), Continuing Operations [Abstract] Current Current State and Local Tax Expense (Benefit) Total provision for income taxes Income Tax Expense (Benefit) Effective income tax rate reconciliation Effective Income Tax Rate Reconciliation, Percent [Abstract] United States statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent State taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Stock-based compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent Foreign taxes, net Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Research and development credit Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent Non-deductible expenses Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent U.S. Tax Act deferred tax re-measurement Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017, Deferred Tax Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017, Deferred Tax Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Domestic and foreign components of income (loss) before taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest [Abstract] U.S. operations Income (Loss) from Continuing Operations before Income Taxes, Domestic Non-U.S. operations Income (Loss) from Continuing Operations before Income Taxes, Foreign Income before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Components of deferred tax assets and liabilities Components of Deferred Tax Assets and Liabilities [Abstract] Deferred tax assets: Components of Deferred Tax Assets [Abstract] Accrued compensation Deferred Tax Assets, Accrued Compensation Amount before allocation of valuation allowances of deferred tax asset attributable to accrued compensation. Net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards Depreciation Deferred Tax Assets, Depreciation Amount before allocation of valuation allowances of deferred tax asset attributable to fixed assets. Tax credits Deferred Tax Assets, Tax Credit Carryforwards Deferred Tax Assets, Capitalized Costs Deferred Tax Assets, Capitalized Costs Deferred Tax Assets, Capitalized Costs Accruals and reserves Deferred Tax Assets, Accruals and Reserves Amount before allocation of valuation allowances of deferred tax asset attributable to accruals and reserves. Total deferred tax assets Deferred Tax Assets, Gross Valuation allowance Deferred Tax Assets, Valuation Allowance Total deferred tax assets, net of valuation allowance Deferred Tax Assets, Net of Valuation Allowance Deferred tax liabilities: Components of Deferred Tax Liabilities [Abstract] Depreciation and amortization Deferred Tax Liabilities, Depreciation and Amortization Amount of deferred tax liability attributable to fixed and intangible assets. Accruals and reserves Deferred Tax Liabilities, Deferred Expense, Reserves and Accruals Total deferred tax liabilities Deferred Tax Liabilities, Gross Net deferred tax assets Deferred Tax Assets, Net Current and non-current deferred tax assets and liabilities Deferred Tax Assets, Net, Classification [Abstract] Long-term deferred tax assets Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Long-term deferred tax liabilities Deferred Tax Liabilities, Net of Valuation Allowance, Noncurrent Amount of noncurrent deferred tax liabilities attributable to deductible temporary differences. Noncurrent liabilities are expected to be realized after one year (or the normal operating cycle, if longer). Unrecognized tax benefits rollforward Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Balance at beginning of year Unrecognized Tax Benefits Additions based on tax positions related to the current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Reductions based on tax positions related to prior years Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Reductions due to lapse of applicable statute of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Balance at end of year Condensed Financial Information of Parent Company Only Disclosure [Abstract] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Parent Company Parent Company [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Net income (loss) including noncontrolling interest Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Other comprehensive loss, net of tax, foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Noncontrolling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income (loss) attributable to Alpha and Omega Semiconductor Limited Comprehensive Income (Loss), Net of Tax, Attributable to Parent Debt Disclosure [Abstract] Line of Credit Facility [Table] Line of Credit Facility [Table] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] China CHINA Lender Name [Axis] Lender Name [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] YinHai Leasing Company and China Import/Export Bank YinHai Leasing Company and China Import/Export Bank [Member] YinHai Leasing Company and China Import/Export Bank [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Lease Financing Lease Financing [Member] Lease Financing [Member] Variable Interest Rate Term Loan Maturing August 2022 Variable Interest Rate Term Loan Maturing August 2022 [Member] Variable Interest Rate Term Loan Maturing August 2022 [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Base Rate Base Rate [Member] LIBOR London Interbank Offered Rate (LIBOR) [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Secured Debt Secured Debt [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Term Loan Term Loan [Member] Term Loan [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Debt term Debt Instrument, Term Basis spread multiple Debt Instrument, Basis Spread on Variable Rate, Multiple Debt Instrument, Basis Spread on Variable Rate, Multiple Amount outstanding Line of Credit Facility, Fair Value of Amount Outstanding Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Additional required capital contributions Debt Instrument, Covenant Compliance, Liability, Additional Required Capital Contributions Debt Instrument, Covenant Compliance, Liability, Additional Required Capital Contributions Stated interest rate Debt Instrument, Interest Rate, Stated Percentage Share-based Compensation [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Stock Options [Member] Employee Stock Option [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Volatility rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Balance Sheet Related Disclosures [Abstract] Deferred revenue Deferred Revenue, Current Deferred costs Deferred Costs, Current Deferred margin Deferred Revenue Net of Deferred Costs, Current Deferred Revenue Net of Deferred Costs, Current Stockholders' Equity Note [Abstract] Shareholders' Equity Stockholders' Equity Note Disclosure [Text Block] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Treasury Stock Reissued [Member] Treasury Stock Reissued [Member] Treasury Stock Reissued [Member] Common Shares [Member] Common Stock [Member] Class of Stock [Line Items] Class of Stock [Line Items] Common Shares Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Common shares, authorized (in shares) Common Stock, Shares Authorized Common shares, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, dividends declared per share Common Stock, Dividends, Per Share, Declared Number of Votes Per Each Common Share Number of Votes Per Each Common Share Number of Votes Per Each Common Share Treasury Shares Treasury Stock, Number of Shares and Restriction Disclosures [Abstract] Share repurchase program, authorized amount Stock Repurchase Program, Authorized Amount Share repurchase program, remaining authorized amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Treasury stock acquired, shares repurchased (in shares) Treasury Stock, Shares, Acquired Treasury stock acquired less handling fees Treasury Stock, Value, Acquired, Cost Method Less Handling Fees Treasury Stock, Value, Acquired, Cost Method Less Handling Fees Treasury stock acquired Treasury Stock, Value, Acquired, Cost Method Treasury stock acquired, average price per share (in dollars per share) Treasury Stock Acquired, Average Cost Per Share Treasury stock retired (in shares) Treasury Stock, Shares, Retired Treasury stock reissued (in shares) Stock Issued During Period, Shares, Share-based Compensation, Gross Treasury stock reissued average price per share Treasury Stock Reissued, Average Price Per Share Treasury Stock Reissued, Average Price Per Share Concentration of Credit Risk and Significant Customers Concentration Risk Disclosure [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Schedule of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Income Statement [Abstract] Revenue Sales Revenue, Goods, Net Cost of goods sold Cost of Goods Sold Gross profit Gross Profit Operating expenses: Operating Expenses [Abstract] Research and development Research and Development Expense Selling, general and administrative Selling, General and Administrative Expense Impairment of long-lived assets Asset Impairment Charges Total operating expenses Operating Expenses Operating income Operating Income (Loss) Interest income and other income (loss), net Other Nonoperating Income (Expense) Interest expense Interest Expense Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income tax expense Net loss attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Net income (loss) attributable to Alpha and Omega Semiconductor Limited Net Income (Loss) Attributable to Parent Net income (loss) per common share attributable to Alpha and Omega Semiconductor Limited Earnings Per Share, Basic and Diluted [Abstract] Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Weighted average number of common share attributable to Alpha and Omega Semiconductor Limited used to compute net income (loss) per share: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted 2019 Capital Leases, Future Minimum Payments Due, Next Twelve Months 2020 Capital Leases, Future Minimum Payments Due in Two Years 2021 Capital Leases, Future Minimum Payments Due in Three Years 2022 Capital Leases, Future Minimum Payments Due in Four Years 2023 Capital Leases, Future Minimum Payments Due in Five Years Thereafter Capital Leases, Future Minimum Payments Due Thereafter Total minimum lease payments Capital Leases, Future Minimum Payments Due Less amount representing interest Capital Leases, Future Minimum Payments, Interest Included in Payments Total capital lease liabilities Capital Lease Obligations Schedule of Condensed Financial Statements [Table] Condensed Financial Statements [Table] Condensed Financial Statements, Captions [Line Items] Condensed Financial Statements, Captions [Line Items] Current assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivable - Intercompany Accounts Receivable, Intercompany Accounts Receivable, Intercompany Other current assets Other Assets, Current Total current assets Assets, Current Property, plant and equipment, net Property, Plant and Equipment, Net Other long-term assets Other Assets, Noncurrent Investment in subsidiaries Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Total assets Assets Current liabilities: Liabilities, Current [Abstract] Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities, Current Total liabilities Liabilities Preferred shares, par value $0.002 per share: Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Authorized: 10,000 shares; Issued and outstanding: none at June 30, 2018 and 2017 Preferred Stock, Value, Issued Common shares, par value $0.002 per share: Authorized: 100,000 shares; issued and outstanding: 30,400 shares and 23,860 shares at June 30, 2018 and 29,600 shares and 23,992 shares at June 30, 2017 Common Stock, Value, Issued Treasury shares at cost; 6,540 shares at June 30, 2018 and 5,608 shares at June 30, 2017 Treasury Stock, Value Additional paid-in capital Additional Paid in Capital Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Retained earnings Retained Earnings (Accumulated Deficit) Total Alpha and Omega Semiconductor Limited shareholder's equity Stockholders' Equity Attributable to Parent Noncontrolling interest Stockholders' Equity Attributable to Noncontrolling Interest Total equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total liabilities and equity Liabilities and Equity Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation Depreciation Share-based compensation expense Share-based Compensation Equity in net (income) loss of subsidiaries Income (Loss) from Equity Method Investments Other Other General Expense Changes in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable - intercompany Increase (Decrease) in Accounts Receivable, Intercompany Increase (Decrease) in Accounts Receivable, Intercompany Other current assets Increase (Decrease) in Other Current Assets Accounts payable and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Investment in subsidiaries Payments to Acquire Additional Interest in Subsidiaries Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Withholding tax on restricted stock units Payments Related to Tax Withholding for Share-based Compensation Proceeds from exercise of stock options and ESPP Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options Payment for repurchase of common shares Payments for Repurchase of Common Stock Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of year Cash and cash equivalents at end of year The Company and Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Schedule I - Notes to the Condensed Unconsolidated Financial Statements Condensed Financial Information of Parent Company Only Disclosure [Text Block] Provision for (benefit from) income taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Effective income tax rate reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Domestic and foreign components of income (loss) Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Components of deferred tax assets and liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of deferred tax assets and liabilities, current and noncurrent Schedule of Deferred Tax Assets and Liabilities, Current and Noncurrent [Table Text Block] Schedule of Deferred Tax Assets and Liabilities, Current and Noncurrent [Table Text Block] Unrecognized tax benefits rollforward Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Earnings Per Share [Abstract] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Employee stock options and RSUs [Member] Stock Options and Restricted Stock Units (RSUs) [Member] Stock Options and Restricted Stock Units (RSUs) [Member] ESPP [Member] Stock Compensation Plan [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Potential dilutive securities (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Restricted Stock [Member] Restricted Stock [Member] Performance Based Restricted Stock Units (PRSUs) Member [Member] Performance Based Restricted Stock Units (PRSUs) Member [Member] Performance Based Restricted Stock Units (PRSUs) Member [Member] Performance Based Restricted Stock Units (PRSUs) Granted In 2017 [Member] Performance Based Restricted Stock Units (PRSUs) Granted In 2017 [Member] Performance Based Restricted Stock Units (PRSUs) Granted In 2017 [Member] Performance Based Restricted Stock Units (PRSUs) Granted In 2018 [Member] Performance Based Restricted Stock Units (PRSUs) Granted In 2018 [Member] Performance Based Restricted Stock Units (PRSUs) Granted In 2018 [Member] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Allocated share-based compensation expense Allocated Share-based Compensation Expense Grants in period, shares earned Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Shares Earned Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Shares Earned Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Nonvested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Nonvested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Nonvested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Nonvested Weighted Average Remaining Recognition Period (Years) Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2016-16 Accounting Standards Update 2016-16 [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Total AOS Shareholders' Equity Parent [Member] Convertible Preferred Shares [Member] Preferred Stock [Member] Treasury Stock [Member] Treasury Stock [Member] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Accumulated Other Comprehensive Income [Member] AOCI Attributable to Parent [Member] Retained Earnings [Member] Retained Earnings [Member] Noncontrolling Interest Noncontrolling Interest [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance (in shares) Preferred Stock, Shares Outstanding Balance (in shares) Common Stock, Shares, Issued Balance (in shares) Treasury Stock, Shares Balance Exercise of common stock options and release of RSUs (in shares) Share-based Compensation Arrangement By Share-based Payment Award, Exercise of Stock Options and Release of Restricted Stock Units in Period Share-based Compensation Arrangement By Share-based Payment Award, Exercise of Stock Options and Release of Restricted Stock Units in Period Exercise of common stock options and release of RSUs Stock Issued During Period, Value, Stock Options Exercised and Restricted Stock Units Released Stock Issued During Period, Value, Stock Options Exercised and Restricted Stock Units Released Reissuance of Treasury Stock (in shares) Stock Issued During Period, Shares, Treasury Stock Reissued Reissuance of Treasury Stock Stock Issued During Period, Value, Treasury Stock Reissued Shares Paid for Tax Withholding for Share Based Compensation Shares Paid for Tax Withholding for Share Based Compensation Adjustments Related to Tax Withholding for Share-based Compensation Adjustments Related to Tax Withholding for Share-based Compensation Issuance of common shares under Employee Stock Purchase Plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Issuance of common shares under Employee Stock Purchase Plan Stock Issued During Period, Value, Employee Stock Purchase Plan Repurchase of common shares under shares repurchase program (in shares) Repurchase of common shares under shares repurchase program Share-based compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Net loss Deferred tax asset related to ASU 2016-06 adoption Deferred Income Tax, Net, Period Increase(Decrease) Deferred Income Tax, Net, Period Increase(Decrease) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Balance (in shares) Balance (in shares) Balance (in shares) Balance Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Noncontrolling Interest Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Noncontrolling Interest, Increase from Subsidiary Equity Issuance Noncontrolling Interest, Increase from Subsidiary Equity Issuance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Share-based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Schedule of Accounts, Notes, Loans and Financing Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Schedule of Inventory, Current Schedule of Inventory, Current [Table Text Block] Schedule of Other Current Assets Schedule of Other Current Assets [Table Text Block] Schedule of Other Assets, Noncurrent Schedule of Other Assets, Noncurrent [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Schedule of Goodwill Schedule of Goodwill [Table Text Block] Schedule of Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Schedule of Product Warranty Liability Schedule of Product Warranty Liability [Table Text Block] Stock Rotation Accrual Stock Rotation Accrual [Table Text Block] Stock Rotation Accrual [Table Text Block] Deferred Margin Deferred Margin [Table Text Block] Deferred Margin [Table Text Block] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] STMicro [Member] STMicro [Member] STMicro [Member] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Licensing Agreements [Member] Licensing Agreements [Member] Patents and exclusive technology rights [Member] Patents and Patented Technology [Member] Patents and Patented Technology [Member] Trade name [Member] Trade Names [Member] Customer relationships [Member] Customer Relationships [Member] Exclusive technology rights Patented Technology [Member] Acquired Finite-Lived Intangible Assets [Line Items] Acquired Finite-Lived Intangible Assets [Line Items] Payments to Acquire Intangible Assets Payments to Acquire Intangible Assets Payments to Acquire Intangible Assets in Calender year 2017 Payments to Acquire Intangible Assets in Calender year 2017 Payments to Acquire Intangible Assets in Calender year 2017 Intangible assets, gross Finite-Lived Intangible Assets, Gross Less accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Intangible Assets, Net (Excluding Goodwill) Intangible Assets, Net (Excluding Goodwill) Goodwill Goodwill Intangible assets, net Intangible Assets, Net (Including Goodwill) Amortization expense Amortization of Intangible Assets Payments to Acquire Intangible Assets in Calender Year 2018 Payments to Acquire Intangible Assets in Calender Year 2018 Payments to Acquire Intangible Assets in Calender Year 2018 Payments to Acquire Intangible Assets in Calendar Year 2019 Payments to Acquire Intangible Assets in Calendar Year 2019 Payments to Acquire Intangible Assets in Calendar Year 2019 Prepayments for property and equipment Prepayment for Property and Equipment Prepayment for Property and Equipment Investments in privately held companies Cost Method Investments Prepaid income tax Prepaid Taxes, Noncurrent Prepaid Taxes, Noncurrent Lease financing costs Lease Financing Costs, Noncurrent Lease Financing Costs, Noncurrent VAT long-term receivable Local VAT Receivable, Noncurrent Local VAT Receivable, Noncurrent Customs deposit Custom deposit non current Custom deposit non current Other long-term deposits Security Deposit Office leases deposits Office Lease Deposit Assets, Noncurrent Office Lease Deposit Assets, Noncurrent Other Other Assets, Miscellaneous, Noncurrent Other long-term assets Commitments and Contingencies Disclosure [Abstract] Schedule of Collaborative Arrangements and Non-collaborative Arrangement Transactions [Table] Schedule of Collaborative Arrangements and Non-collaborative Arrangement Transactions [Table] Facility in Liangjiang New Area of Chongqing (the 'Joint Venture') Facility in Liangjiang New Area of Chongqing (the 'Joint Venture') [Member] Facility in Liangjiang New Area of Chongqing (the 'Joint Venture') [Member] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Corporate Joint Venture Corporate Joint Venture [Member] Other Commitments [Axis] Other Commitments [Axis] Other Commitments [Domain] Other Commitments [Domain] Design Fees Design Fees [Member] Design Fees Construction and Procurement Fees Construction and Procurement Fees [Member] Construction and Procurement Fees [Member] Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] Payments to Acquire Interest in Joint Venture Payments to Acquire Interest in Joint Venture Contractual Obligation Contractual Obligation Contractual Obligation, Future Minimum Payments Due, Remainder of Calendar Year Contractual Obligation, Future Minimum Payments Due, Remainder of Calendar Year Contractual Obligation, Future Minimum Payments Due, Remainder of Calendar Year Contractual Obligation, Due in Second Year Contractual Obligation, Due in Second Year Contractual Obligation, Payment Contractual Obligation, Payment Contractual Obligation, Payment Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Basic: Weighted Average Number of Shares Outstanding, Basic [Abstract] Weighted average number of common shares used to compute basic net income (loss) per share Diluted: Effect of potentially dilutive securities: Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] Stock options, RSUs and ESPP shares Weighted average number of common shares used to compute diluted net income (loss) per share Net income (loss) per share attributable to common shareholders: Earnings Per Share Reconciliation [Abstract] Statement of Cash Flows [Abstract] Adjustments to reconcile net income (loss) to net cash provided by operating activities: Depreciation and amortization Depreciation, Amortization and Accretion, Net Deferred income taxes, net Increase (Decrease) in Deferred Income Taxes (Gain) loss on disposal of property and equipment Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Changes in assets and liabilities: Accounts receivable Increase (Decrease) in Accounts Receivable Inventories Increase (Decrease) in Inventories Other current and long-term assets Increase (Decrease) in Other Operating Assets Accounts payable Increase (Decrease) in Accounts Payable Income taxes payable Increase (Decrease) in Income Taxes Payable Accrued and other liabilities Increase (Decrease) in Accrued Liabilities Purchase of property and equipment excluding JV Company Payment to Acquire Property, Plant, and Equipment Excluding JV Company Payment to Acquire Property, Plant, and Equipment Excluding JV Company Purchase of property and equipment in JV Company Payments to Acquire Property, Plant and Equipment in JV Company Payments to Acquire Property, Plant and Equipment in JV Company Purchases of land use rights in JV Company Payments to purchase land use rights in JV Company Payments to purchase land use rights in JV Company Purchases of intangible assets Proceeds from sale of property and equipment Proceeds from Sale of Other Property, Plant, and Equipment (Increase) decrease in restricted cash Increase (Decrease) in Restricted Cash for Operating Activities Investment in a privately held company Payments to Acquire Investments Proceeds from investment by noncontrolling interest Proceeds from Noncontrolling Interests Proceeds from borrowings Proceeds from Issuance of Debt Proceeds from financing lease Proceeds from Lease Financing Proceeds from Lease Financing Repayments of borrowings Repayments of Debt Principal payments on capital leases Repayments of Long-term Capital Lease Obligations Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash and Cash Equivalents Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Cash paid for interest Interest Paid Cash paid for income taxes Income Taxes Paid Supplemental disclosures of non-cash investing and financing information: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Property and equipment purchased but not yet paid Capital Expenditures Incurred but Not yet Paid Property and equipment acquired under capital leases Capital Lease Obligations Incurred Reissuance of treasury stock Stock Issued Segment Reporting [Abstract] Segment and Geographic Information Segment Reporting Disclosure [Text Block] Summary of Stock Option Activities Share-based Compensation, Stock Options, Activity [Table Text Block] Shares Authorized under Stock Option Plans, by Exercise Price Range Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] Restricted Stock Units Activity Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Employee Stock 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Risk, Terms of Sales on Credit Customers greater than 10% of total Concentration Risk, Percentage Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Cost of goods sold Cost of Sales [Member] Research and development Research and Development Expense [Member] Selling, general and administrative Selling, General and Administrative Expenses [Member] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Unrecognized compensation expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Recognition period of share-based compensation expense (in years) Equity Method Investments and Joint Ventures [Abstract] Schedule of Stockholders Equity Schedule of Stockholders Equity [Table Text Block] Loss Contingencies [Table] Loss Contingencies [Table] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Indemnification Agreement [Member] Indemnification Agreement [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Indemnification accrual Loss Contingency Accrual Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Segment, Geographical [Domain] Hong Kong HONG KONG South Korea KOREA, REPUBLIC OF United States UNITED STATES Other countries Other Countries [Member] Other Countries [Member] Products and Services [Axis] Products and Services [Axis] Products and Services [Domain] Products and Services [Domain] Power discrete [Member] Power Discrete [Member] Power Discrete [Member] Power IC [Member] Power IC [Member] Power IC [Member] Packaging and testing services [Member] Packaging and testing services [Member] Packaging and testing services [Member] Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Exercise Price Range [Axis] Exercise Price Range [Axis] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Price Range $7.21 - 7.21 [Member] Price Range 1 [Member] Price Range 1 [Member] Price Range $7.44 - 7.44 [Member] Price Range 2 [Member] Price Range 2 [Member] Price Range $7.56 - 9.90 [Member] Price Range 3 [Member] Price Range 3 [Member] Price Range $10.50 - 15.00 [Member] Price Range 4 [Member] Price Range 4 [Member] Price Range $17.90 - $18.00 (Member) Price Range 5 [Member] Price Range 5 [Member] Price Range $7.21 - 18.00 Member Price Range 6 [Member] Price Range 6 [Member] Number Outstanding (in shares) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options Weighted-Average Remaining Contractual Life (Years) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term Weighted-Average Exercise Price (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price Number Exercisable (in shares) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options Weighted-Average Exercise Price (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price Exercise price, upper range limit (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Exercise price, lower range limit (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Chongqing Funds Chongqing Funds [Member] Chongqing Funds [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Investments in and Advances to Affiliates, at Fair Value Investments in and Advances to Affiliates, at Fair Value Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions Consideration Transferred to Acquire Interest in Joint Venture Consideration Transferred to Acquire Interest in Joint Venture Consideration Transferred to Acquire Interest in Joint Venture Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Finite-Lived Intangible Assets, Amortization Expense, Year Two Finite-Lived Intangible Assets, Amortization Expense, Year Two Finite-Lived Intangible Assets, Amortization Expense, Year Three Finite-Lived Intangible Assets, Amortization Expense, Year Three Finite-Lived Intangible Assets, Amortization Expense, Year Four Finite-Lived Intangible Assets, Amortization Expense, Year Four Finite-Lived Intangible Assets, Amortization Expense, Year Five Finite-Lived Intangible Assets, Amortization Expense, Year Five Finite-Lived Intangible Assets, Amortization Expense, after Year Five Finite-Lived Intangible Assets, Amortization Expense, after Year Five Intangible assets, net Finite-Lived Intangible Assets, Net Statement of Comprehensive Income [Abstract] Comprehensive income (loss) Schedule of Capital Leased Assets Schedule of Capital Leased Assets [Table Text Block] Schedule of Future Minimum Lease Payments for Capital Leases Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block] Fiscal Year Maturity Schedule Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block] 2019 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2020 Long-term Debt, Maturities, Repayments of Principal in Year Two 2021 Long-term Debt, Maturities, Repayments of Principal in Year Three 2022 Long-term Debt, Maturities, Repayments of Principal in Year Four 2023 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Total debt, excluding debt issuance costs Long-term Debt, Gross Less: debt issuance costs Debt Issuance Costs, Gross Total debt, less debt issuance costs Long-term Debt Short-term Debt Debt, Current [Abstract] Principal amount Short-term Debt Less: debt issuance costs Debt Issuance Costs, Gross, Current Total debt, less debt issuance costs Debt, Current Long-term Debt Long-term Debt, Excluding Current Maturities [Abstract] Principal amount Long-term Debt, Excluding Current Maturities, Gross Long-term Debt, Excluding Current Maturities, Gross Less: debt issuance costs Debt Issuance Cost, Gross, Noncurrent Principal amount Long-term Debt, Excluding Current Maturities Number of Operating Segments Number of Operating Segments Tax Credit Carryforward [Table] Tax Credit Carryforward [Table] Valuation Allowance by Deferred Tax Asset [Axis] Valuation Allowance by Deferred Tax Asset [Axis] Deferred Tax Asset [Domain] Deferred Tax Asset [Domain] State research and development credit carryforward State Research And Development Credit Carryforward [Member] State Research And Development Credit Carryforward [Member] Net operating loss, fixed asset and intangible asset Net Operating Loss, Fixed Asset And Intangible Asset [Member] Net Operating Loss, Fixed Asset And Intangible Asset [Member] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Federal [Member] Domestic Tax Authority [Member] State [Member] State and Local Jurisdiction [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Long-term Income Tax Payable [Member] Long-term Income Tax Payable [Member] Long-term Income Tax Payable [Member] Tax Credit Carryforward [Line Items] Tax Credit Carryforward [Line Items] Decrease in deferred tax assets Decrease in deferred tax assets Decrease in deferred tax assets Increase in prepaid tax asset Increase in prepaid tax asset Increase in prepaid tax asset De-recognition of prepaid tax asset Deferred Tax Asset, Intra-entity Transfer, Asset Other than Inventory Valuation allowance Tax credit carryforward Tax Credit Carryforward, Amount Tax credit carryforward, subject to expiration Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration Tax credit carryforward, not subject to expiration Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration Net operating loss carryforwards Operating Loss Carryforwards Research and development tax credit carryforwards Deferred Tax Assets, Tax Credit Carryforwards, Research Undistributed earnings of foreign subsidiaries Undistributed Earnings of Foreign Subsidiaries Unrecognized tax benefits Unrecognized tax benefit, amount netted against deferred tax assets Unrecognized Tax Benefit, Amount Netted Against Deferred Tax Assets The gross amount of unrecognized tax benefits that have been netted against deferred tax assets Unrecognized tax benefits that would reduce effective income tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Decrease in unrecognized tax benefits is reasonably possible Decrease in Unrecognized Tax Benefits is Reasonably Possible Income tax interest and penalties accrued Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Income tax interest and penalties expense Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense VAT receivable Local VAT Receivable Local VAT (Value Added Tax) Receivable Other prepaid expenses Other Prepaid Expense, Current Prepaid insurance Prepaid Insurance Prepaid maintenance Prepaid Maintenance, Current Prepaid Maintenance, Current Prepayment to supplier Prepayment to Supplier Prepayment to Supplier Prepaid income tax Prepaid Taxes Customs deposit Customs deposit Customs deposit Lease financing cost Lease Financing Costs, Current Lease Financing Costs, Current Other receivables Other Receivables, Net, Current Total other current assets Statement of Financial Position [Abstract] ASSETS Assets [Abstract] Restricted cash Restricted Cash and Cash Equivalents, Current Accounts receivable, net Accounts Receivable, Net, Current Inventories Inventory, Net Intangible assets, net Deferred income tax assets - long-term LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Accounts payable Accounts Payable, Current Accrued liabilities Accrued Liabilities, Current Income taxes payable Accrued Income Taxes, Current Short-term debt Deferred margin Capital leases Capital Lease Obligations, Current Total current liabilities Liabilities, Current Long-term debt Income taxes payable - long-term Accrued Income Taxes, Noncurrent Deferred income tax liabilities Deferred Tax Liabilities, Net, Noncurrent Capital leases - long-term Long-term Debt and Capital Lease Obligations Other long-term liabilities Other Liabilities, Noncurrent Commitments and contingencies (Note 13) Commitments and Contingencies Equity: Stockholders' Equity Attributable to Parent [Abstract] Total Alpha and Omega Semiconductor Limited shareholders’ equity Total equity Total liabilities and equity Revenue Revenue from Related Parties Cost of revenue Cost of Revenue Gross profit Operating loss Interest income Investment Income, Interest Income (loss) on equity investment in subsidiaries Net income (loss) attributable to Alpha and Omega Semiconductor Limited Subsequent Event Subsequent Events [Text Block] Accounts receivable Accounts Receivable, Gross Less: Allowance for price adjustments Allowance for Price Adjustments Receivable, Current Allowance for Price Adjustments Receivable, Current Less: Allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current Accounts receivable, net Accounts Receivable, Net Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Valuation and Qualifying Accounts [Abstract] Valuation and Qualifying Accounts Disclosure [Table] Valuation and Qualifying Accounts Disclosure [Table] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves [Domain] Valuation Allowances and Reserves [Domain] Allowance for Doubtful Accounts [Member] Allowance for Doubtful Accounts [Member] Allowance for Price Adjustments [Member] Allowance for Price Adjustments [Member] Allowance for Price Adjustments [Member] Valuation Allowance of Deferred Tax Assets [Member] Valuation Allowance of Deferred Tax Assets [Member] Valuation and Qualifying Accounts Disclosure [Line Items] Valuation and Qualifying Accounts Disclosure [Line Items] Movement in Valuation Allowances and Reserves [Roll Forward] Movement in Valuation Allowances and Reserves [Roll Forward] Balance Valuation Allowances and Reserves, Balance Additions Valuation Allowances and Reserves, Additions for Charges to Cost and Expense Reductions Valuation Allowances and Reserves, Deductions Balance Employee Stock [Member] Employee Stock [Member] Duration of offering periods for ESPP (in months) Duration of Offering Periods For Employee Share Purchase Plan Duration of Offering Periods For Employee Share Purchase Plan Percent of compensation allowed for purchase of options Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate Payroll deduction accumulation period (in months) Share-based Compensation Arrangement by Share-based Payment Award, Payroll Deduction Accumulation Period Share-based Compensation Arrangement by Share-based Payment Award, Payroll Deduction Accumulation Period Grant price, percent of fair value of common stock at date of grant Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent Maximum number of common shares that may be purchased on any purchase date (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Common Shares That May be Purchased On Any Purchase Date Share-based Compensation Arrangement by Share-based Payment Award, Number of Common Shares That May be Purchased On Any Purchase Date Maximum number of common shares that may be purchased per a 24-month offering period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Common Shares that May Be Purchased Per a 24-Month Offering Period Share-based Compensation Arrangement by Share-based Payment Award, Number of Common Shares that May Be Purchased Per a 24-Month Offering Period Maximum value of common stock that may be purchased in any one calendar year Share-Based Compensation Arrangement By Share-based Payment Award, Value of Common Stock That May Be Purchased in Any One Calendar Year Share-Based Compensation Arrangement By Share-based Payment Award, Value of Common Stock That May Be Purchased in Any One Calendar Year Shares authorized under plan (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Annual increase in shares authorized, percent Share-based Compensation Arrangement By Share Based Payment Award, Annual Calender Year Increase in Shares Authorized, Percent Share-based Compensation Arrangement By Share Based Payment Award, Annual Calendar Year Increase in Shares Authorized, Percent Annual increase in shares authorized (in shares) Share-based Compensation Arrangement By Share Based Payment Award, Annual Calender Year Increase in Shares Authorized Share-based Compensation Arrangement By Share Based Payment Award, Annual Calender Year Increase in Shares Authorized Number of additional shares authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Weighted-average grant date fair value Fair Value Assumptions For ESPP Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Volatility rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Expected option life (in years) Debt Debt Disclosure [Text Block] Restricted Statutory Reserves [Table] Restricted Statutory Reserves [Table] Restricted Statutory Reserves [Table] Entity by Location [Axis] Entity by Location [Axis] Location [Domain] Location [Domain] China Subsidiaries [Member] Subsidiaries [Member] Restricted Statutory Reserves [Line Items] Restricted Statutory Reserves [Line Items] Restricted Statutory Reserves [Line Items] Foreign subsidiaries, minimum percent of after-tax profit required annually in statutory reserves Percent of After-tax Profit Required Annually in Statutory Reserves Percent of After-tax Profit Required Annually in Statutory Reserves Foreign subsidiaries, statutory reserves maximum cumulative amount as a percent of registered capital Statutory Reserves, Cumulative Amount as a Percent of Registered Capital Statutory Reserves, Cumulative Amount as a Percent of Registered Capital Foreign subsidiaries, restricted statutory reserves Foreign Subsidiaries, Restricted Statutory Reserves, Amount Foreign Subsidiaries, Restricted Statutory Reserves, Amount Foreign subsidiaries, restricted statutory reserves percent of parent consolidated net assets Foreign Subsidiaries, Restricted Statutory Reserves, Percent of Parent Consolidated Net Assets Foreign Subsidiaries, Restricted Statutory Reserves, Percent of Parent Consolidated Net Assets Basis of Preparation Basis of Accounting, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Foreign Currency Transactions and Translation Foreign Currency Transactions and Translations Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Accounts Receivable Trade and Other Accounts Receivable, 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[Policy Text Block] Advertising Advertising Cost, Policy, Expensed Advertising Cost [Policy Text Block] Comprehensive Income (loss) Comprehensive Income, Policy [Policy Text Block] Leases Lessee, Leases [Policy Text Block] Risks and Uncertainties Risks and Uncertainties [Policy Text Block] Risks and Uncertainties [Policy Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Balance Sheet Components Supplemental Balance Sheet Disclosures [Text Block] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Land [Member] Land [Member] Building [Member] Building [Member] Manufacturing machinery and equipment [Member] Machinery and Equipment [Member] Equipment and tooling [Member] Equipment and Tooling [Member] Equipment and Tooling 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Products and Services [Table Text Block] Operating leases, future minimum lease payments Lessee, Operating Lease, Disclosure [Table Text Block] Document and Entity Information [Abstract] Document and Entity Information [Abstract] Entities [Table] Entities [Table] Entity Information [Line Items] Entity Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Public Float Entity Public Float Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Canceled or forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Outstanding (in shares) Options vested and expected to vest (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Exercisable (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Outstanding (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Canceled or forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Outstanding (in dollars per share) Options vested and expected to vest (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Exercisable (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Outstanding, Weighted Average Remaining Contractual Term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Options, vested and expected to vest, Weighted Average Remaining Contractual Term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Exercisable, Weighted Average Remaining Contractual Term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Aggregate Intrinsic Value, Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Exercisable, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Accrued compensation and benefits Accrued Salaries, Current Warranty accrual Product Warranty Accrual, Current Stock rotation accrual Stock Rotation Accrual, Current Stock Rotation Accrual, Current Accrued professional fees Accrued Professional Fees, Current Accrued inventory Accrued Inventory Accrued Inventory Accrued facilities related expenses Accrued Facility Expenses Accrued Facility Expenses Accrued financing lease costs Accrued Financing Lease Liability, Current Accrued Financing Lease Liability, Current Accrued property, plant and equipment Accrued Property, Plant and Equipment Accrued Property, Plant and Equipment Other accrued expenses Other Accrued Liabilities, Current Accrued liabilities Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Parent Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Simple Annual Interest Rate to Noncontrolling Interest if Joint Venture is Early Terminated and Liquidated Simple Annual Interest Rate to 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