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Issuance of common stock, net (in shares) Stock Issued During Period, Shares, New Issues Current assets: Assets, Current [Abstract] Options forfeited/expired (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period Total liabilities and stockholders’ equity Liabilities and Equity Other (in shares) Adjustments To Additional Paid In Capital, Other Shares Adjustments to additional paid in capital other shares. 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Other Performance Measure, Amount Other Performance Measure, Amount Weighted-Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Entity Address, State or Province Entity Address, State or Province Impairment loss on right-of-use asset Operating Lease, Impairment Loss Marketable securities Marketable Securities, Policy [Policy Text Block] Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Class A Warrants Class A Warrants [Member] Class A Warrants Total current liabilities Liabilities, Current Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Percent reduction in workforce Restructuring and Related Cost, Number of Positions Eliminated, Period Percent 2020 Employee Stock Purchase Plan Two Thousand Twenty Employee Stock Purchase Plan [Member] 2020 employee stock purchase plan. 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Assets Assets [Abstract] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Class of Warrant or Right [Domain] Class of Warrant or Right [Domain] Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss, Current Vesting [Domain] Vesting [Domain] Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Fair value measurements Fair Value Disclosures [Text Block] Stockholders’ equity: Equity, Attributable to Parent [Abstract] State credits Effective Income Tax Rate Reconciliation, State Tax Credit Effective income tax rate reconciliation state tax credit. 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