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Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Shares Issuable Under Options Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] State State and Local Jurisdiction [Member] Cover [Abstract] Money market funds and U.S. Treasury bills Cash and Cash Equivalents, Fair Value Disclosure Other Deferred Tax Assets, Other Maximum Maximum [Member] Exercisable, weighted-average exercise price (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Capitalized research and development Deferred Tax Assets, Capitalized Research And Development Deferred Tax Assets, Capitalized Research And 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Disqualification of Tax Benefits, Amount Total Lessor, Operating Lease, Payment to be Received Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Segment net loss Loss before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Other long-term liabilities Other Liabilities, Noncurrent Reportable Segment Reportable Segment [Member] Reportable Segment Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Gross Unrealized Losses Unrealized Losses [Abstract] Unrealized Losses Statement of Stockholders' Equity [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Long-term liabilities Increase (Decrease) in Other Noncurrent Liabilities Net comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Other income, net 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Lease, Liability, Current Schedule of Reconciliation of Level 3 Financial Liabilities Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Maturities of marketable securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Class of Stock [Line Items] Class of Stock [Line Items] Document Fiscal Period Focus Document Fiscal Period Focus In-process research and development In-process research and development expenses Research and Development Expense, In Process Research and Development Expense, In Process Award Timing Method Award Timing Method [Text Block] Award Type [Axis] Award Type [Axis] Net carrying amount Long-Term Debt Term to authorize additional shares Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Additional Shares Authorized, Term Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Additional Shares Authorized, Term Total assets 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assets held for sale Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Common stock, shares outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Additions, net Restructuring Reserve, Period Increase (Decrease) Shares Available for Grant Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Available For Issuance [Roll Forward] Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Available For Issuance Plan Name [Axis] Plan Name [Axis] Property, Plant and Equipment, Net Property, Plant and Equipment, Policy [Policy Text Block] PEO PEO [Member] Gross Unrealized Gains Unrealized Gains [Abstract] Unrealized Gains Employee Benefits Employee Severance [Member] Accrued expenses and other current liabilities Total accrued expenses and other current liabilities Accrued Liabilities And Other Liabilities, Current Accrued Liabilities And Other Liabilities, Current Additional 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Amount Deferred tax liabilities: Deferred Tax Liabilities, Gross [Abstract] Commitments and Contingencies Disclosure [Abstract] Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] General and administrative General and Administrative Expense Unrecognized compensation cost Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net cash used in operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Accrued expenses and other current liabilities Increase (Decrease) In Accrued Liabilities And Other Liabilities Increase (Decrease) In Accrued Liabilities And Other Liabilities Debt instrument term (in years) Debt Instrument, Term Effective Income Tax Rate Reconciliation [Table] Effective Income Tax Rate Reconciliation [Table] Useful life Property, Plant and Equipment, 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Assumptions, Expected Dividend Rate Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Additional milestone payments Additional Milestone Payments, Contingent Amount Additional Milestone Payments, Contingent Amount MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name Statutory tax rate differences Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Restructuring costs Restructuring costs Payments for Restructuring Restructuring Type [Axis] Restructuring Type [Axis] Change in fair value of contingent consideration Business Combination, Contingent Consideration, Change in Contingent Consideration, Liability, Increase (Decrease) Non-cash lease expense Operating Lease, Non-cash Lease (Income) Expense Operating Lease, Non-cash Lease (Income) Expense Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation 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