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Represents the information pertaining to warrant common stock. 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 [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Revision of Prior Period, Reclassification, Adjustment Revision of Prior Period, Reclassification, Adjustment [Member] Upfront license fee Collaborative Arrangement, Rights and Obligations, Upfront Fee Collaborative Arrangement, Rights and Obligations, Upfront Fee Reclassification of Series C Preferred Stock from mezzanine equity to permanent equity Reclassifications of Temporary to Permanent Equity 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] Less accumulated depreciation Property, Plant, And Equipment And Operating Lease Right-Of-Use Asset, Accumulated Depreciation And Amortization Property, Plant, And Equipment And Operating Lease Right-Of-Use Asset, Accumulated Depreciation And Amortization Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss Statement Of Financial Position Extensible List Not Disclosed Flag Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss Statement Of Financial Position Extensible List Not Disclosed Flag Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss Statement Of Financial Position Extensible List Not Disclosed Flag Insider Trading Arrangements [Line Items] Excess of initial warrant fair value over private placement proceeds Excess of initial warrant fair value over private placement proceeds Excess of Initial Warrant Fair Value Over Private Placement Proceeds Excess of Initial Warrant Fair Value Over Private Placement Proceeds Maximum aggregate milestone payment Collaborative Arrangement, Rights and Obligations, Maximum Aggregate Milestone Payments Collaborative Arrangement, Rights and Obligations, Maximum Aggregate Milestone Payments Total liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Acquired In-Process Research and Development Expenses In Process Research and Development, Policy [Policy Text Block] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Issuance of common stock pursuant to ATM Program, net Stock Issued During Period, Value, New Issues Counterparty Name [Axis] Counterparty Name [Axis] Number of classes of stock authorized to issue Number Of Class Of Stock Authorized The number of classes of stock permitted to be issued by an entity's charter and bylaws. Accrued expenses and other current liabilities Asset Acquisition, Liabilities, Accrued Expenses And Other, Current Asset Acquisition, Liabilities, Accrued Expenses And Other, Current Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member]