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Entity Shell Company Entity Shell Company Fair value liabilities transferred from level 2 to level 1 Fair Value Liabilities Level 2 To Level 1 Transfer Amount Fair value liabilities level 2 to level 1 transfer amount. Total stock-based compensation expense Share-Based Payment Arrangement, Expense Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Fair Value, Recurring and Nonrecurring [Table] Employee stock purchase plan, available for future issuance. 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Grantee Status [Domain] Leases Lessee, Leases [Policy Text Block] Weighted Average Exercise, Exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Stockholders' equity Stockholders' Equity Attributable to Parent [Abstract] Counterparty Name Counterparty Name [Axis] Weighted-Average Grant Date Fair Value, Forfeited Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Award Type Award Type [Axis] Two thousand and twenty equity incentive plan member. Two Thousand And Twenty Equity Incentive Plan [Member] 2020 Equity Incentive Plan Subsequent Event Subsequent Event [Member] Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Research and Development Expense, Total Research and development Research and Development Expense Total undiscounted lease payments Lessee, Operating Lease, Liability, to be Paid Fair value assets transferred from level 2 to level 1 Fair Value Asset Level 2 To Level 1 Transfer Amount Fair value asset level 2 to level 1 transfer amount Entity Central Index Key Entity Central Index Key Short-term Investments, Total Short-term investments Short-Term Investments Numerator: Net Income (Loss) Attributable to Parent [Abstract] Accounting Policies [Abstract] Accrued expenses and other current liabilities. 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Financial Assets Included Within Long Term Investments Financial Assets Included Within Long Term Investments Member Financial assets included within long-term investments. 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Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Financial Instrument Financial Instrument [Axis] Long-Lived Tangible Asset Long-Lived Tangible Asset [Axis] Liabilities and Stockholders' Equity Liabilities and Equity [Abstract] Property and Equipment, Net Property, Plant and Equipment, Policy [Policy Text Block] Fair value assets transferred from level 1 to level 2 Fair Value Asset Level 1 To Level 2 Transfer Amount Fair value asset level 1 to level 2 transfer amount. Antidilutive Securities, Name Antidilutive Securities, Name [Domain] Number of letters of credit issued to landlord constituting restricted cash Number Of Stand By Letters Of Credit Consisted In Restricted Cash Number of stand-by letters of credit consisted in restricted cash. 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Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Domain] Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Operating sublease, term of contract Operating Sublease Term Of Contract Operating sublease term of contract. Repayments of Notes Payable Payment of Paycheck Protection Program loan Payment of Paycheck Protection Program loan Cover [Abstract] Number of Restricted Stock Awards, Released Vested restricted stock awards Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Current liabilities: Liabilities, Current [Abstract] Maximum Maximum [Member] Unrealized gain (loss) on investments, net OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Unrealized gain (loss) on investments Summary of Stock-Based Compensation Expense Recorded in Statements of Operations and Allocated Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Furniture and Fixtures Furniture and Fixtures [Member] Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Shares, Exercised Exercise of stock options, (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Level 3 Fair Value, Inputs, Level 3 [Member] Use of Estimates Use of Estimates, Policy [Policy Text Block] Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Segments Segment Reporting, Policy [Policy Text Block] Long-term Investments, Total Long-term investments Long-Term Investments Useful lives of property and equipment Property, Plant and Equipment, Useful Life Common stock, shares authorized Common Stock, Shares Authorized Operating lease, lease commenced, expiration period Lessee Operating Lease Lease Commenced Expiration Period Lessee​ operating ​lease ​lease ​commenced​ expiration ​period. Trading Symbol Trading Symbol Title of Individual Title of Individual [Domain] Subsequent Event Type Subsequent Event Type [Axis] Non-cash operating lease expense Operating Lease, Right-of-Use Asset, Amortization Expense Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Risk-free interest rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Accounts Payable, Current, Total Accounts payable Accounts Payable, Current Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Other assets Increase (Decrease) in Other Operating Assets, Total Other assets Increase (Decrease) in Other Operating Assets Denominator: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Title of Individual Title of Individual [Axis] Long-Lived Tangible Asset Long-Lived Tangible Asset [Domain] Common stock, par value Common Stock, Par or Stated Value Per Share Stock Issued During Period, Value, Conversion of Convertible Securities Conversion of preferred stock to common stock Restricted stock awards granted Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Useful lives of property and equipment Property, Plant and Equipment, Estimated Useful Lives Weighted Average Exercise Price, Granted Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Anti Dilutive Shares Additional non-dilutive shares Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Non-cash financing and investing activities: Noncash Investing and Financing Items [Abstract]