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Violation of Home Country Law, Amount Weighted average risk-free rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Entity Tax Identification Number Entity Tax Identification Number Operating expenses: Costs and Expenses [Abstract] Asset Acquisition [Axis] Asset Acquisition [Axis] Current assets Inventory, Net [Abstract] Beginning balance (in dollars per share) Ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Agreements for clinical and marketing services, termination notice period (in days) Agreements For Clinical And Marketing Services, Termination Notice Period Agreements For Clinical And Marketing Services, Termination Notice Period Forgone 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Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Use of Estimates Use of Estimates, Policy [Policy Text Block] Tax provision on other comprehensive income (loss) Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Insider Trading Arrangements [Line Items] Security Exchange Name Security Exchange Name Vesting period for subsequent stock options granted to employees and new directors (in years) Share Based Compensation Arrangement By Share Based Payment Annual Award Vesting Period Employees And New Directors Period which an employee and new director's right to exercise an annual option award is no longer contingent on satisfaction of either a service, market or a performance condition. Product and Service, Other Product and Service, Other [Member] Total liabilities Liabilities Marketable securities Fair Market Value Debt Securities, Available-for-Sale, Excluding Accrued Interest, Current Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Sales and maturities of marketable securities Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Statement [Line Items] Statement [Line Items] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Counterparty Name [Axis] Counterparty Name [Axis] Schedule of RSU Activity Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Common Stock Common Stock [Member] Grant date fair value of common stock granted (in shares) Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Corporate debt Corporate Debt Securities [Member] Net change 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 Professional fees Accrued Professional Fees, Current Research and Development Arrangement, Contract to Perform for Others, Type [Domain] Research and Development Arrangement, Contract to Perform for Others, Type [Domain]