Entity Central Index Key Document and Entity Information [Abstract] Document And Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Well Known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Ex Transition Period Entity Ex Transition Period Entity Shell Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Entity Public Float Entity Public Float Grant and incentive receivables. Unearned income current. Unearned income noncurrent. Statement Of Financial Position [Abstract] Assets Assets [Abstract] Current assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Grant and incentive receivables Grant And Incentive Receivables Restricted cash Restricted Cash Current Prepaid expenses and other current assets Prepaid Expense And Other Assets Current Total current assets Assets Current Property and equipment, net Property Plant And Equipment Net Restricted cash Restricted Cash Noncurrent Other assets Other Assets Noncurrent Total assets Assets Liabilities and Stockholders’ Equity Liabilities And Stockholders Equity [Abstract] Current liabilities: Liabilities Current [Abstract] Accounts payable Accounts Payable Current Accrued expenses Accrued Liabilities Current Unearned income Unearned Income Current Loans payable, net of discount Loans Payable Current Total current liabilities Liabilities Current Loan payable, net of discount and current portion Long Term Loans Payable Unearned income Unearned Income Noncurrent Other long-term liabilities Other Liabilities Noncurrent Total liabilities Liabilities Commitments and contingencies Commitments And Contingencies Stockholders’ equity: Stockholders Equity [Abstract] Common stock Common Stock Value Additional paid-in capital Additional Paid In Capital Common Stock Accumulated other comprehensive income Accumulated Other Comprehensive Income Loss Net Of Tax Accumulated deficit Retained Earnings Accumulated Deficit Total stockholders' equity Stockholders Equity Total liabilities and stockholders’ equity Liabilities And Stockholders Equity Common stock, par value Common Stock Par Or Stated Value Per Share Common stock, shares authorized Common Stock Shares Authorized Common stock, shares issued Common Stock Shares Issued Common stock, shares outstanding Common Stock Shares Outstanding Grant and incentive income. Income Statement [Abstract] Revenue: Revenue From Contract With Customer [Abstract] Revenue Revenue From Contract With Customer Excluding Assessed Tax Type of Revenue [Extensible List] Type Of Revenue Extensible List Operating expenses: Operating Expenses [Abstract] Research and development Research And Development Expense General and administrative General And Administrative Expense Total operating expenses Operating Expenses Loss from operations Operating Income Loss Other income (expense): Nonoperating Income Expense [Abstract] Grant and incentive income Grant And Incentive Income Interest expense Interest Expense Interest income Investment Income Interest Change in fair value of warrant liability Fair Value Adjustment Of Warrants Change in fair value of derivative liability Derivative Gain Loss On Derivative Net Loss on extinguishment of debt Gains Losses On Extinguishment Of Debt Other income (expense), net Other Nonoperating Income Expense Total other income (expense), net Nonoperating Income Expense Net loss Net Income Loss Accretion of redeemable convertible preferred stock to redemption value Temporary Equity Accretion To Redemption Value Adjustment Net loss attributable to common stockholders Net Income Loss Available To Common Stockholders Basic Net loss per share attributable to common stockholders—basic and diluted Earnings Per Share Basic And Diluted Weighted average common shares outstanding—basic and diluted Weighted Average Number Of Share Outstanding Basic And Diluted Statement Of Income And Comprehensive Income [Abstract] Net loss Other comprehensive loss: Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Foreign currency translation gain (loss) Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Comprehensive loss Comprehensive Income Net Of Tax Adjustments to additional paid In capital conversion of convertible preferred stock warrants into common stock warrants. Statement Of Stockholders Equity [Abstract] Statement [Table] Statement [Table] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid In Capital [Member] Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income [Member] Accumulated Deficit Retained Earnings [Member] Redeemable Convertible Preferred Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Redeemable Convertible Preferred Stock Redeemable Convertible Preferred Stock [Member] Shareholders' Equity Class Shareholders Equity Class [Axis] Fair Value by Shareholders' Equity Class Fair Value By Shareholders Equity Class [Domain] Series C Preferred Stock Series C Preferred Stock [Member] Series D Convertible Redeemable Preferred Stock [Member] Series D Convertible Redeemable Preferred Stock Series D Convertible Redeemable Preferred Stock [Member] Sale of Stock Subsidiary Sale Of Stock [Axis] Sale of Stock Sale Of Stock Name Of Transaction [Domain] Initial Public Offering I P O [Member] Private Placement Private Placement [Member] Statement [Line Items] Statement [Line Items] Beginning balance Beginning balance (in shares) Beginning balance Temporary Equity Carrying Amount Attributable To Parent Beginning balance (in shares) Temporary Equity Shares Outstanding Issuance of stock, net of issuance costs Temporary Equity Stock Issued During Period Value New Issues Issuance of stock, net of issuance costs (in shares) Stock Issued During Period Shares New Issues Conversion of convertible preferred stock into common stock upon closing of initial public offering Stock Issued During Period Value Conversion Of Convertible Securities Conversion of convertible preferred stock into common stock upon closing of initial public offering (in shares) Stock Issued During Period Shares Conversion Of Convertible Securities Issuance of stock, net of issuance costs Stock Issued During Period Value New Issues Conversion of convertible preferred stock warrants into common stock warrants Adjustments To Additional Paid In Capital Conversion Of Convertible Preferred Stock Warrants Into Common Stock Warrants Exercise of common stock options Stock Issued During Period Value Stock Options Exercised Exercise of common stock options (in shares) Stock Issued During Period Shares Stock Options Exercised Issuance of common stock under employee stock purchase plan Stock Issued During Period Value Employee Stock Purchase Plan Issuance of common stock under employee stock purchase plan (in shares) Stock Issued During Period Shares Employee Stock Purchase Plans Issuance of restricted common stock Stock Issued During Period Value Restricted Stock Award Gross Issuance of restricted common stock, (in Share) Stock Issued During Period Shares Restricted Stock Award Gross Stock-based compensation expense Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Foreign currency translation adjustment Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax Ending balance Ending balance (in shares) Ending balance Ending balance (in shares) Ending balance Shares Outstanding Issuance costs Adjustments To Additional Paid In Capital Stock Issued Issuance Costs Non-cash interest expense. Adjustment of non cash rent expense. Increase decrease in grant and incentive receivables. Increase decrease in unearned income. Issuance of loans payable. Payments of issuance costs of convertible promissory notes. Payments of issuance costs of redeemable convertible preferred stock. Deferred initial public offering costs included in accounts payable and accrued expenses. Issuance of redeemable convertible preferred stock upon extinguishment of convertible promissory notes. Extinguishment of convertible promissory notes. Extinguishment of derivative liability in connection with extinguishment of convertible promissory notes. Conversion of convertible preferred stock warrants to common stock warrants. Conversion of redeemable convertible preferred stock to common stock. Statement Of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided By Used In Operating Activities [Abstract] Adjustments to reconcile net loss to net cash used in operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Stock-based compensation expense Share Based Compensation Depreciation and amortization expense Depreciation Depletion And Amortization Non-cash interest expense Non Cash Interest Expense Non-cash rent expense Adjustment Of Non Cash Rent Expense Loss on extinguishment of debt Change in fair value of warrant liability Change in fair value of derivative liability Changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Grant and incentive receivables Increase Decrease In Grant And Incentive Receivables Prepaid expenses and other assets Increase Decrease In Prepaid Deferred Expense And Other Assets Accounts payable Increase Decrease In Accounts Payable Accrued expenses Increase Decrease In Accrued Liabilities Unearned income Increase Decrease In Unearned Income Net cash used in operating activities Net Cash Provided By Used In Operating Activities Cash flows from investing activities: Net Cash Provided By Used In Investing Activities [Abstract] Purchases of property and equipment Payments To Acquire Productive Assets Net cash used in investing activities Net Cash Provided By Used In Investing Activities Cash flows from financing activities: Net Cash Provided By Used In Financing Activities [Abstract] Proceeds from issuance of redeemable convertible preferred stock Proceeds From Issuance Of Redeemable Convertible Preferred Stock Proceeds from issuance of loans payable Proceeds From Issuance Of Loans Payable Proceeds from issuance of convertible promissory notes Proceeds From Convertible Debt Proceeds from issuance of loans under funding agreements Proceeds From Issuance Of Debt Proceeds from issuance of common stock in initial public offering Proceeds From Issuance Initial Public Offering Proceeds from issuance of common stock in private placement Proceeds From Issuance Of Private Placement Proceeds from exercise of stock options Proceeds From Stock Options Exercised Repayments of loans payable Repayments Of Long Term Debt Payments of issuance costs of convertible promissory notes Payments Of Issuance Costs Of Convertible Promissory Notes Payments of issuance costs of redeemable convertible preferred stock Payments Of Issuance Costs Of Redeemable Convertible Preferred Stock Payments of issuance costs of loans payable Payments Of Financing Costs Payments of stock issuance cost Payments Of Stock Issuance Costs Net cash provided by (used in) financing activities Net Cash Provided By Used In Financing Activities Effect of exchange rate changes on cash Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Net increase (decrease) in cash, cash equivalents and restricted cash Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect Cash, cash equivalents and restricted cash at beginning of period Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Cash, cash equivalents and restricted cash at end of period Supplemental disclosure of non-cash investing and financing activities: Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract] Purchases of property and equipment included in accounts payable and accrued expenses Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 Initial public offering costs included in accounts payable and accrued expenses Deferred Initial Public Offering Costs Included In Accounts Payable And Accrued Expenses Issuance of redeemable convertible preferred stock upon extinguishment of convertible promissory notes Issuance Of Redeemable Convertible Preferred Stock Upon Extinguishment Of Convertible Promissory Notes Derivative liability in connection with issuance of convertible promissory notes Liabilities Assumed1 Extinguishment of convertible promissory notes Extinguishment Of Convertible Promissory Notes Extinguishment of derivative liability in connection with extinguishment of convertible promissory notes Extinguishment Of Derivative Liability In Connection With Extinguishment Of Convertible Promissory Notes Issuance of warrants in connection with issuance of loans payable Noncash Or Part Noncash Acquisition Payables Assumed1 Conversion of redeemable convertible preferred stock warrants into common stock warrants Conversion Of Convertible Preferred Stock Warrants To Common Stock Warrants Conversion of redeemable convertible preferred stock into common stock Conversion Of Redeemable Convertible Preferred Stock To Common Stock Accretion of redeemable convertible preferred stock to redemption value Organization Consolidation And Presentation Of Financial Statements [Abstract] Nature of the Business Business Description And Basis Of Presentation [Text Block] Accounting Policies [Abstract] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract] Prepaid Expenses and Other Current Assets Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Text Block] Property Plant And Equipment [Abstract] Property and Equipment, Net Property Plant And Equipment Disclosure [Text Block] Accrued expenses. Payables And Accruals [Abstract] Accrued Expenses Accrued Expenses [Text Block] Collaboration. Collaboration [Abstract] Collaboration, License and Funding Arrangements Collaborative Arrangement Disclosure [Text Block] Debt Disclosure [Abstract] Loans Payable Debt Disclosure [Text Block] Convertible Promissory Notes Short Term Debt [Text Block] Equity [Abstract] Redeemable Convertible Preferred Stock Preferred Stock [Text Block] Common Stock Stockholders Equity Note Disclosure [Text Block] Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Stock-Based Compensation Disclosure Of Compensation Related Costs Share Based Payments [Text Block] License Revenue Revenue From Contract With Customer [Text Block] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Earnings Per Share [Abstract] Net Loss per Share Earnings Per Share [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Related Party Transactions [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block]