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restricted cash as shown on the consolidated statements of cash flows Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Defined contribution plan, employer discretionary contribution amount Defined Contribution Plan, Employer Discretionary Contribution Amount Temporary Equity [Line Items] Temporary Equity [Line Items] Accrued expenses Total accrued expenses Accrued Liabilities, Current Series B Preferred Stock Series B Redeemable Convertible Preferred Stock [Member] Series B Redeemable Convertible Preferred Stock Local Phone Number Local Phone Number Operating loss carryforwards, subject to expiration Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration Redeemable convertible preferred stock, shares outstanding Beginning balance (in shares) Ending balance (in shares) Preferred Stock outstanding Temporary Equity, Shares Outstanding Tranche One Share-based Payment Arrangement, Tranche One [Member] Schedule of Stock by Class [Table] Schedule of 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Nonrecurring Basis [Line Items] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Weighted average remaining contractual term outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Domain] Award Type [Domain] Long-term liabilities: Liabilities, Noncurrent [Abstract] Trading Symbol Trading Symbol Weighted average exercise price exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Commitment Other Commitment Property, Plant and Equipment Disclosure Property, Plant and Equipment Disclosure [Text Block] Net Loss per Share Earnings Per Share [Text Block] Other Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent Organization, Consolidation and Presentation of Financial Statements [Abstract] Current liabilities: Liabilities, Current [Abstract] Federal statutory income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Entity Shell Company Entity Shell Company Fair Value, Recurring Fair Value, Recurring [Member] Weighted average exercise price vested and expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Segments Segment Reporting, Policy [Policy Text Block] New Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Statement of Financial Position [Abstract]