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tax rate if recognized Unrecognized Tax Benefits that Would Impact Effective Tax Rate Schedule of Computation of Basic and Diluted Net Loss Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Director Director [Member] Subsequent Events [Abstract] Subsequent Events [Abstract] Segment Reporting [Abstract] Segment Reporting [Abstract] Systems Systems [Member] Systems Vested/Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares Debt Disclosure [Abstract] Debt Disclosure [Abstract] Two Customers Two Customers [Member] Two Customers San Jose San Jose [Member] San Jose Discount Debt Instrument, Unamortized Discount Inventory, Net Inventory, Net [Abstract] Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-based Compensation Arrangement by Share-based Payment Award Share-based Compensation Arrangement by Share-based Payment Award Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Schedule of Fair Value Measurements, Recurring and Nonrecurring Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Subsequent Event Subsequent Events [Text Block] Withholding taxes related to net share settlement of restricted stock units (in shares) Restricted Stock, Shares, Shares Issued For Withholdings Taxes Restricted Stock, Shares, Shares Issued For Withholdings Taxes Insider Trading Arrangements [Line Items] Total liabilities Liabilities Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Line of credit facility, commitment fee percentage Line of Credit Facility, Commitment Fee Percentage Product Offerings Product Concentration Risk [Member] Total Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Termination Date [Domain] Termination Date [Domain] Termination Date [Domain] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Net carrying amount of the liability component Debt Instrument, Convertible, Carrying Amount Of Liability Component Debt Instrument, Convertible, Carrying Amount Of Liability Component Trade name and trademarks Trademarks and Trade Names [Member] Issuance of Series A Convertible Preferred Stock, net of issuance costs Stock Issued During Period, Value, New Issues Unamortized financing costs Unamortized Debt Issuance Expense Variable Rate [Axis] Variable Rate [Axis] Consolidation Items [Axis] Consolidation Items [Axis] Fair value Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other than Options, Grants In Period, Fair Value Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other than Options, Grants In Period, Fair Value Counterparty Name [Axis] Counterparty Name [Axis] Conversion threshold trading days (in days) Debt Instrument, Convertible, Threshold Trading Days Principal amounts settled in cash Debt Instrument, Convertible, Principal Amounts Settled in Cash Debt Instrument, Convertible, Principal Amounts Settled in Cash Fair Value Total Short-term investments: Debt Securities, Available-for-Sale Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Corporate debt securities Corporate Debt Securities [Member] Schedule of Income Tax Benefit Associated with Stock-Based Compensation Cash Proceeds Received and Tax Benefit from Share-Based Payment Awards [Table Text Block]