Entity Central Index Key Cover [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 Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers Entity Interactive Data Current Entity Interactive Data Current Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Well-known Seasoned Issuer Entity Well Known Seasoned Issuer Entity Public Float Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding ICFR Auditor Attestation Flag Icfr Auditor Attestation Flag Entity Shell Company Entity Shell Company Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Ex Transition Period Entity Ex Transition Period Title of 12(b) Security Security12b Title Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity File Number Entity File Number Entity Incorporation, State or Country Code Entity Incorporation State Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address Address Line1 Entity Address Address Line Two Entity Address Address Line2 Entity Address, City or Town Entity Address City Or Town Entity Address, State or Province Entity Address State Or Province Entity Address, Postal Zip Code Entity Address Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Document Annual Report Document Annual Report Document Transition Report Document Transition Report Documents Incorporated by Reference Documents Incorporated By Reference [Text Block] Statement Of Financial Position [Abstract] Assets Assets [Abstract] Current assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Restricted cash Restricted Cash Current Short-term investments Short Term Investments Prepaid and other current assets Prepaid Expense And Other Assets Current Total current assets Assets Current Property and equipment, net Property Plant And Equipment Net 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 Total current liabilities Liabilities Current Commitments and contingencies (Note 5) Commitments And Contingencies Stockholders’ equity: Stockholders Equity [Abstract] Preferred stock, $0.001 par value, 10,000,000 shares authorized as of December 31, 2020 and 2019, respectively, no shares issued and outstanding as of December 31, 2020 and 2019, respectively Temporary Equity Carrying Amount Attributable To Parent Common stock, $0.001 par value, 100,000,000 shares authorized as of December 31, 2020 and 2019, respectively; 19,931,660 and 13,788,982 shares issued and outstanding as of December 31, 2020 and 2019, respectively Common Stock Value Additional paid-in capital Additional Paid In Capital Common Stock Accumulated other comprehensive loss 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 Preferred stock, par value Temporary Equity Par Or Stated Value Per Share Preferred stock, shares authorized Temporary Equity Shares Authorized Preferred stock, shares issued Temporary Equity Shares Issued Preferred stock, shares outstanding Temporary Equity Shares Outstanding 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 Income Statement [Abstract] 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 expenses, net Other Nonoperating Income Expense Net loss before income tax Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Income tax benefit (expense) Income Tax Expense Benefit Net loss Net Income Loss Other comprehensive income (loss): Other Comprehensive Income Loss Tax [Abstract] Unrealized gain on available-for-sale securities Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax Foreign currency translation adjustments Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Total other comprehensive loss Other Comprehensive Income Loss Net Of Tax Comprehensive loss Comprehensive Income Net Of Tax Net loss per share, basic and diluted Earnings Per Share Basic And Diluted Weighted-average shares used to compute net loss per share, basic and diluted Weighted Average Number Of Share Outstanding Basic And Diluted Temporary equity, stock issued during period, shares, new issues. Temporary equity conversion of convertible preferred stock into common stock, shares. Temporary equity conversion of convertible preferred stock into common stock value. Capital contribution related to extinguishment of preferred stock liability. Issuance of common stock warrant in connection with debt financing. Statement Of Stockholders Equity [Abstract] Statement [Table] Statement [Table] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Convertible Preferred Stock Convertible Preferred Stock [Member] 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 Loss Accumulated Other Comprehensive Income [Member] Retained Earnings Retained Earnings [Member] Sale of Stock Subsidiary Sale Of Stock [Axis] Sale of Stock Sale Of Stock Name Of Transaction [Domain] Public Offerings I P O [Member] Statement [Line Items] Statement [Line Items] Beginning balance Beginning balance, shares Beginning balance Beginning balance, shares Shares Outstanding Issuance of convertible preferred stock, net of issuance costs Temporary Equity Stock Issued During Period Value New Issues Issuance of convertible preferred stock, net of issuance costs, shares Temporary Equity Stock Issued During Period Shares New Issues Conversion of convertible preferred stock into common stock upon completion of initial public offering Stock Issued During Period Value Conversion Of Convertible Securities Temporary Equity, Conversion of convertible preferred stock into common stock upon completion of initial public offering, shares Temporary Equity Conversion Of Convertible Preferred Stock Into Common Stock Shares Temporary Equity, Conversion of convertible preferred stock into common stock upon completion of initial public offering Temporary Equity Conversion Of Convertible Preferred Stock Into Common Stock Value Conversion of convertible preferred stock into common stock upon completion of initial public offering, shares Stock Issued During Period Shares Conversion Of Convertible Securities Issuance of common stock Stock Issued During Period Value New Issues Issuance of common stock, shares Stock Issued During Period Shares New Issues Capital contribution related to extinguishment of convertible preferred stock liability Capital Contribution Related To Extinguishment Of Preferred Stock Liability Issuance of common stock upon exercise of stock options Stock Issued During Period Value Stock Options Exercised Issuance of common stock upon exercise of stock options, shares Stock Issued During Period Shares Stock Options Exercised Stock Issued During Period Value Employee Stock Purchase Plan Stock Issued During Period Value Employee Stock Purchase Plan Issuance of common stock upon ESPP purchase, Shares Stock Issued During Period Shares Employee Stock Purchase Plans Issuance Of Common Stock Warrants In Connection With Debt Financing Issuance Of Common Stock Warrants In Connection With Debt Financing Share-based compensation Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Net loss Other comprehensive loss Ending balance Ending balance, shares Ending balance Ending balance, shares Temporary equity, issuance costs. Temporary equity settlement of convertible preferred stock liability. Stock issued during period issuance costs. Convertible preferred shares. Convertible Preferred Shares Convertible Preferred Shares [Member] Temporary equity, issuance costs Temporary Equity Issuance Costs Temporary equity, settlement of convertible preferred stock liability Temporary Equity Settlement Of Convertible Preferred Stock Liability Stock issuance costs Stock Issued During Period Issuance Costs Deferred tax assets. Revaluation of convertible preferred stock liability. Proceeds from issuance public offering. Issuance of common stock warrant in connection with term loan facility. Property and equipment purchases included in accounts payable. Conversion of convertible preferred stock into common stock at initial public offering. Statement Of Cash Flows [Abstract] ESPP Purchases Employee Stock [Member] Cash flows from operating activities: Net Cash Provided By Used In Operating Activities [Abstract] Net loss Profit Loss 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] Depreciation Depreciation Share-based compensation Share Based Compensation Deferred tax assets Deferred Tax Assets Revaluation of convertible preferred stock liability Revaluation Of Convertible Preferred Stock Liability Amortization of premium on available-for-sale securities Accretion Amortization Of Discounts And Premiums Investments Amortization of debt issuance costs Amortization Of Financing Costs Changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Prepaids and other current assets Increase Decrease In Prepaid Deferred Expense And Other Assets Other assets Increase Decrease In Other Operating Assets Accounts payable Increase Decrease In Accounts Payable Accrued expenses Increase Decrease In Accrued Liabilities 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 available-for-sale securities Payments To Acquire Available For Sale Securities Proceeds from maturities of available-for-sale securities Proceeds From Sale And Maturity Of Available For Sale Securities Purchases of property and equipment Payments To Acquire Property Plant And Equipment 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 common stock upon public offerings, net of issuance costs Proceeds From Issuance Public Offering Proceeds from issuance of common stock upon initial public offering, net of issuance costs Proceeds From Issuance Initial Public Offering Proceeds from issuance of convertible preferred stock and convertible preferred stock liability, net of issuance costs Proceeds From Issuance Of Convertible Preferred Stock Proceeds from issuance of common stock upon stock option exercises Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options Proceeds from issuance of common stock Proceeds From Issuance Of Common Stock Payment of debt issuance costs Payments Of Debt Issuance Costs Net cash provided by financing activities Net Cash Provided By Used In Financing Activities Net increase in cash and cash equivalents, and restricted cash Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect Cash and cash equivalents, and restricted cash at beginning of period Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Cash and cash equivalents, and restricted cash at end of period Components of cash and cash equivalents, and restricted cash: Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract] Restricted cash Restricted Cash And Cash Equivalents Supplemental disclosures of noncash information: Supplemental Cash Flow Information [Abstract] Issuance of common stock warrant in connection with term loan facility Issuance Of Common Stock Warrant In Connection With Term Loan Facility Property and equipment purchases included in accounts payable Property And Equipment Purchases Included In Accounts Payable Cash paid for taxes Income Taxes Paid Net Conversion of convertible preferred stock into common stock at close of initial public offering Conversion Of Convertible Preferred Stock Into Common Stock At Initial Public Offering Organization Consolidation And Presentation Of Financial Statements [Abstract] Organization and Basis of Presentation Organization Consolidation And Presentation Of Financial Statements Disclosure [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] Balance Sheet Related Disclosures [Abstract] Consolidated Balance Sheet Components Supplemental Balance Sheet Disclosures [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Debt Disclosure [Abstract] Term Loan Long Term Debt [Text Block] Convertible preferred stock. Temporary Equity Disclosure [Abstract] Convertible Preferred Stock Convertible Preferred Stock Disclosure [Text Block] Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Share-Based Compensation Disclosure Of Compensation Related Costs Share Based Payments [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] Subsequent Events [Abstract] Subsequent Event Subsequent Events [Text Block] Basis of Presentation Basis Of Accounting Policy Policy [Text Block] Principles of Consolidation Consolidation Policy [Text Block] Reclassification Prior Period Reclassification Adjustment Description Foreign Currencies Foreign Currency Transactions And Translations Policy [Text Block] Use of Estimates Use Of Estimates Fair Value Measurements Fair Value Measurement Policy Policy [Text Block] Concentrations of Credit Risk Concentration Risk Credit Risk Other risks and uncertainties. Other Risks and Uncertainties Other Risks And Uncertainties Policy [Text Block] Segment Reporting Segment Reporting Policy Policy [Text Block] Cash and Cash Equivalents and Restricted Cash Cash And Cash Equivalents Restricted Cash And Cash Equivalents Policy Investments Investment Policy [Text Block] Property and Equipment, Net Property Plant And Equipment Policy [Text Block] Impairment of Long-Lived Assets Impairment Or Disposal Of Long Lived Assets Policy [Text Block] Accrued research and development expenses. Accrued Research and Development Expenses Accrued Research And Development Expenses Policy [Text Block] Leases Lessee Leases Policy [Text Block] Convertible preferred stock liability. Convertible Preferred Stock Liability Convertible Preferred Stock Liability Policy [Text Block] Research and Development Expenses Research And Development Expense Policy Share-Based Compensation Share Based Compensation Option And Incentive Plans Policy Income Taxes Income Tax Policy [Text Block] Basic and Diluted Net Loss per Share Earnings Per Share Policy [Text Block] Comprehensive Loss Comprehensive Income Policy Policy [Text Block] Recently adopted accounting standards. Recently Adopted Accounting Standards Recently Adopted Accounting Standards Policy [Text Block] Recent Accounting Pronouncements New Accounting Pronouncements Policy Policy [Text Block] Summary of Financial Assets Measured at Fair Value on Recurring Basis Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis Table [Text Block] Schedule of Contractual Maturities of Cash Equivalents and Available-for-Sale Securities Investments Classified By Contractual Maturity Date Table [Text Block] Summary of Changes in Fair Value of Level 3 Liability Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Text Block] Summary of Fair Value Assumptions Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques Table [Text Block] Schedule of Property and Equipment, Net Property Plant And Equipment [Text Block] Schedule of Accrued Expenses Schedule Of Accrued Liabilities Table [Text Block] Schedule of Future Minimum Lease Payments Under Non-cancellable Operating Lease Obligations Schedule Of Future Minimum Rental Payments For Operating Leases Table [Text Block] Summary of Share-Based Compensation Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Text Block] Summary of Estimated Fair Value of Option Awards Granted Using Black-Scholes Option-Pricing Model Schedule Of Share Based Payment Award Stock Options Valuation Assumptions Table [Text Block] Summary of Stock Option Activity Schedule Of Share Based Compensation Stock Options Activity Table [Text Block] Schedule of effective income tax rate of company and subsidiaries. Schedule of Effective Income Tax Rate of Company and Subsidiaries [Table Text Block] Schedule Of Effective Income Tax Rate Of Company And Subsidiaries Table [Text Block] Summary of Income Tax Benefit (Expense) Schedule Of Components Of Income Tax Expense Benefit Table [Text Block] Summary of Components of Deferred Tax Assets Schedule Of Deferred Tax Assets And Liabilities Table [Text Block] Summary of Loss from Continuing Operations Before Taxes on Income Schedule Of Income Before Income Tax Domestic And Foreign Table [Text Block] Summary of Reconciliation of Income Tax Benefit (Expense) Statutory Tax Rate to Effective Tax Rate Schedule Of Effective Income Tax Rate Reconciliation Table [Text Block] Schedule of Outstanding Potentially Dilutive Securities Excluded From Calculation of Diluted Net Loss Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Text Block] Subsidiary Or Equity Method Investee Sale Of Stock By Subsidiary Or Equity Investee [Table] Subsidiary Or Equity Method Investee Sale Of Stock By Subsidiary Or Equity Investee [Table] Underwriters option Over Allotment Option [Member] Underwritten Public Offering [Member] Underwritten public offering Underwritten Public Offering [Member] Subsidiary Sale Of Stock [Line Items] Subsidiary Sale Of Stock [Line Items] Date of incorporation Entity Incorporation Date Of Incorporation Reorganization exchange of equity percentage of ordinary shares exchanged. Reorganization exchange of equity percentage of common stock issued upon exchange. Reorganization exchange of equity percentage of ordinary shares exchanged Reorganization Exchange Of Equity Percentage Of Common Stock Issued Upon Exchange Reorganization exchange of equity percentage of common stock issued upon exchange Reorganization Exchange Of Equity Percentage Of Ordinary Shares Exchanged Payments of stock issuance costs, other. Shares issued and sold IPO price per share Shares Issued Price Per Share Payment of underwriting discounts, commissions Payments Of Stock Issuance Costs Other offering expenses Payments Of Stock Issuance Costs Other Convertible preferred stock automatically converted into common stock Convertible Preferred Stock Shares Issued Upon Conversion Reverse stock split conversion ratio Stockholders Equity Note Stock Split Conversion Ratio1 Proceeds from issuance of common stock gross. Gross proceeds from issue of common stock Proceeds From Issuance Of Common Stock Gross Proceeds from issuance of common stock, net of underwriters discount and commissions Cash and cash equivalents Cash Cash Equivalents And Short Term Investments Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Information related to various accounting policies of the entity. Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Statistical Measurement Range [Axis] Statistical Measurement Range [Member] Minimum Minimum [Member] Maximum Maximum [Member] Long-Lived Tangible Asset Property Plant And Equipment By Type [Axis] Long-Lived Tangible Asset Property Plant And Equipment Type [Domain] Leasehold Improvements Leasehold Improvements [Member] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Number of operating segments Number Of Operating Segments Realized gains or losses on investments Realized Investment Gains Losses Property and equipment, estimated useful lives Property Plant And Equipment Useful Life Leasehold improvements amortization, description Property Plant And Equipment Estimated Useful Lives Capital contributions related to extinguishment of preferred stock liability. Capital contribution by the preferred stockholders Capital Contributions Related To Extinguishment Of Preferred Stock Liability Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Measurement Frequency Fair Value By Measurement Frequency [Axis] Measurement Frequency Fair Value Measurement Frequency [Domain] Recurring Fair Value Measurements Recurring [Member] Fair Value Hierarchy and NAV Fair Value By Fair Value Hierarchy Level [Axis] Fair Value Hierarchy and NAV Fair Value Measurements Fair Value Hierarchy [Domain] Level 1 Fair Value Inputs Level1 [Member] Level 2 Fair Value Inputs Level2 [Member] Investment Type Investment Type [Axis] Investments Investment Type Categorization [Member] Money Market Funds Money Market Funds [Member] Commercial Paper Commercial Paper [Member] Agency bonds Agency Securities [Member] U.S. government bonds U S Government Agencies Shortterm Debt Securities [Member] Corporate Debt Corporate Debt Securities [Member] U.S. treasury bills U S Treasury Bill Securities [Member] Agency discount securities. Agency discount securities Agency Discount Securities [Member] Municipal Bonds Municipal Bonds [Member] Cash equivalents Cash Equivalents [Member] Short-term investments Short Term Investments [Member] Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Short-term investments, Amortized Cost Available For Sale Debt Securities Amortized Cost Basis Short-term investments, Gross Unrealized Holding Gains Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax Short-term investments, Gross Unrealized Holding Losses Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax Short-term investments, Aggregated Fair Value Available For Sale Securities Debt Securities Available for sale securities debt maturities after one through two years fair value. Within one year Available For Sale Securities Debt Maturities Within One Year Fair Value After one year through two years Available For Sale Securities Debt Maturities After One Through Two Years Fair Value Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Table] Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Table] Level 3 Fair Value Inputs Level3 [Member] Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] Fair value measurement, financial liability Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value Fair value measurement, financial assets Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value Fair value measurement with unobservable inputs reconciliation partial settlement of convertible preferred stock liability upon third closing. Fair value measurement with unobservable inputs reconciliation capital contribution related to the extinguishment of preferred stock liability. Beginning balance Revaluation of convertible preferred stock liability recorded in other expenses (income), net Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings Partial settlement of convertible preferred stock liability upon third closing Fair Value Measurement With Unobservable Inputs Reconciliation Partial Settlement Of Convertible Preferred Stock Liability Upon Third Closing Capital contribution related to extinguishment of preferred stock liability Fair Value Measurement With Unobservable Inputs Reconciliation Capital Contribution Related To Extinguishment Of Preferred Stock Liability Ending balance Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Table] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Table] Liability Class Fair Value By Liability Class [Axis] Fair Value by Liability Class Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation By Liability Class [Domain] Convertible preferred stock liability. Convertible Preferred Stock Liability Convertible Preferred Stock Liability [Member] Valuation Approach and Technique Valuation Technique [Axis] Valuation Approach and Technique Valuation Technique [Domain] Black Scholes Option Pricing Model Valuation Technique Option Pricing Model [Member] Measurement Input Type Measurement Input Type [Axis] Measurement Input Type Measurement Input Type [Domain] Stock Price Measurement Input Share Price [Member] Exercise Price Measurement Input Exercise Price [Member] Expected Term (Years) Measurement Input Expected Term [Member] Expected Volatility Measurement Input Price Volatility [Member] Risk-free Interest Rate Measurement Input Risk Free Interest Rate [Member] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] Fair Measurement Input Debt Instrument Measurement Input Fair Measurement Input Debt Instrument Term Schedule Of Property Plant And Equipment [Table] Schedule Of Property Plant And Equipment [Table] Computer Equipment Computer Equipment [Member] Furniture and office equipment. Furniture and Office Equipment Furniture And Office Equipment [Member] Property Plant And Equipment [Line Items] Property Plant And Equipment [Line Items] Total property and equipment Property Plant And Equipment Gross Less: accumulated depreciation Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Total property and equipment, net Depreciation expense for property and equipment Accrued research and development expense current. Payables And Accruals [Abstract] Accrued research and development expenses Accrued Research And Development Expense Current Accrued employee and related expenses Employee Related Liabilities Current Accrued professional and legal fees Accrued Professional Fees Current Accrued other Other Accrued Liabilities Current Total accrued expenses Operating lease monthly rental payments. Loss Contingencies [Table] Loss Contingencies [Table] Balance Sheet Location Balance Sheet Location [Axis] Balance Sheet Location Balance Sheet Location [Domain] Restricted cash and other assets member. Restricted Cash And Other Assets Member Restricted Cash And Other Assets [Member] Collaborative Arrangement and Arrangement Other than Collaborative Type Of Arrangement [Axis] Collaborative Arrangement and Arrangement Other than Collaborative Arrangements And Nonarrangement Transactions [Member] Teva agreement. Teva Agreements Teva Agreement [Member] Research and Development Arrangement, Contract to Perform for Others, Type Research And Development Arrangement Contract To Perform For Others By Type [Axis] Research and Development Arrangement, Contract to Perform for Others, Type Research And Development Arrangement Contract To Perform For Others Type [Domain] Tevas glycoPEGylated FGF21 program. Teva?s GlycoPEGylated FGF21 Program Tevas Glyco P E Gylated F G F21 Program [Member] Tevas development program. Teva?s Development Program Tevas Development Program [Member] Income Statement Location Income Statement Location [Axis] Income Statement Location Income Statement Location [Domain] Research and Development Expenses Research And Development Expense [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Lessee, operating lease, description Description Of Lessee Leasing Arrangements Operating Leases Operating lease, payments Operating Lease Monthly Rental Payments Lessee, operating lease term of contract Lessee Operating Lease Term Of Contract 2021 Lessee Operating Lease Liability Payments Due Next Twelve Months 2022 Lessee Operating Lease Liability Payments Due Year Two Total future minimum annual payments Operating Leases Future Minimum Payments Due Operating leases, rent expense Lease And Rental Expense Security deposit Security Deposit Asset transfer and license agreements initial nonrefundable upfront payment. Obligation to payment upon maximum achievement of certain clinical and commercial milestones. Nonrefundable upfront payment Asset Transfer And License Agreement Initial Nonrefundable Upfront Payment Payment upon achievement of certain clinical and commercial milestones Obligation To Payment Upon Maximum Achievement Of Certain Clinical And Commercial Milestones Asset transfer and license agreement termination period after written notice. Asset transfer and license agreement termination period notice of failure. Asset transfer and license agreement termination notice period if bankruptcy petition filed. Asset transfer and license agreement, termination period after written notice Asset Transfer And License Agreement Termination Period After Written Notice Asset transfer and license agreement, termination period notice of breach Asset Transfer And License Agreement Termination Period Notice Of Failure Asset transfer and license agreement termination notice period if bankruptcy petition filed Asset Transfer And License Agreement Termination Notice Period If Bankruptcy Petition Filed Upfront license payment. Up-front license payment Up Front License Payment Debt Instrument [Table] Debt Instrument [Table] Loan and security agreement. Loan Agreement Loan And Security Agreement [Member] Debt Instrument Debt Instrument [Axis] Debt Instrument, Name Debt Instrument Name [Domain] Term A loan facility. Term A Loan Facility Term A Loan Facility [Member] Term b loan facility. Term B Loan Facility Term B Loan Facility [Member] Variable Rate Variable Rate [Axis] Variable Rate Variable Rate [Domain] Prime Rate Prime Rate [Member] Dividends Measurement Input Expected Dividend Payment [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Line of credit facility, maximum borrowing capacity Line Of Credit Facility Maximum Borrowing Capacity Debt instrument, interest rate Debt Instrument Interest Rate During Period Debt instrument, basis spread on variable rate Debt Instrument Basis Spread On Variable Rate1 Credit facility maturity date Line Of Credit Facility Expiration Date1 Line of credit facility, description Line Of Credit Facility Description Amount drawn Line Of Credit Fair value of warrant assumptions, dividends. Warrants to purchase common stock Class Of Warrant Or Right Number Of Securities Called By Warrants Or Rights Warrant exercise price Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1 Warrant expiration date Warrants And Rights Outstanding Maturity Date Fair value of warrant assumptions, dividends Fair Value Of Warrants Assumptions Dividends Debt issuance costs, gross Deferred Finance Costs Gross Debt issuance costs Deferred Finance Costs Net Total amount of preferred shares issuable by the entity. Number of shares committed to purchase, no longer issuable. Temporary Equity By Class Of Stock [Table] Temporary Equity By Class Of Stock [Table] Financial Instrument Financial Instrument [Axis] Financial Instruments Transfers And Servicing Of Financial Instruments Types Of Financial Instruments [Domain] Series A share purchase agreement. Series A Share Purchase Agreement Series A Share Purchase Agreement [Member] Series A convertible preferred stock. Series A Convertible Preferred Stock Series A Convertible Preferred Stock [Member] Temporary Equity [Line Items] Temporary Equity [Line Items] Total amount of preferred shares issuable by the entity Amount Of Preferred Shares Issuable By Entity Per share price of issuance of shares Number of shares committed to purchase, no longer issuable Number Of Shares Committed To Purchase No Longer Issuable Number of shares issuable under share-based payment arrangement. Period for increase in number of shares of common stock reserved for issuance. Percentage of increase in number of shares of capital stock reserved for issuance. Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Plan Name Plan Name [Axis] Plan Name Plan Name [Domain] 2019 equity incentive plan. 2019 Plan Two Thousand And Nineteen Equity Incentive Plan [Member] Two thousand and twenty equity incentive plan. 2020 Plan Two Thousand And Twenty Equity Incentive Plan [Member] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Number of common shares issuable under the plan (in shares) Number Of Shares Issuable Under Share Based Payment Arrangement Period for increase in number of shares of common stock reserved for issuance Period For Increase In Number Of Shares Of Common Stock Reserved For Issuance Percentage of increase in number of shares of capital stock issued and outstanding Percentage Of Increase In Number Of Shares Of Capital Stock Issued And Outstanding Common stock reserved and available for issuance as future option grants Common Stock Capital Shares Reserved For Future Issuance Share based compensation arrangement by share based payment award remaining options vesting period. Vesting period Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 Percentage of option vesting Sharebased Compensation Arrangement By Sharebased Payment Award Award Vesting Rights Percentage Terms of award Share Based Compensation Arrangement By Share Based Payment Award Terms Of Award Remaining option vesting period Share Based Compensation Arrangement By Share Based Payment Award Remaining Options Vesting Period Expiration period Sharebased Compensation Arrangement By Sharebased Payment Award Expiration Period Percent of purchase shares of common stock Sharebased Compensation Arrangement By Sharebased Payment Award Purchase Price Of Common Stock Percent Share based compensation arrangement by share based payment second offering period. Share based compensation arrangement by share based payment second offering period commencement date. Share based compensation arrangement by share based payment first offering period. Share based compensation arrangement by share based payment first offering period commencement date. First offering period Share Based Compensation Arrangement By Share Based Payment First Offering Period Commencement date of first six month offering period Share Based Compensation Arrangement By Share Based Payment First Offering Period Commencement Date Second offering period Share Based Compensation Arrangement By Share Based Payment Second Offering Period Commencement date of second six month offering period Share Based Compensation Arrangement By Share Based Payment Second Offering Period Commencement Date Number of shares of common stock available for issuance under ESPP Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Research and Development General and Administrative General And Administrative Expense [Member] Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] Share-based compensation Allocated Share Based Compensation Expense Expected term (years) Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 Contractual term (years) Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term Simplified Method Expected volatility, minimum Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Minimum Expected volatility, maximum Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Maximum Risk-free interest rate, minimum Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Minimum Risk-free interest rate, maximum Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Maximum Expected dividend Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate Number of Options Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Roll Forward Outstanding, Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number Granted Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross Exercised Cancelled Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Outstanding, Ending Balance Exercisable as of December 31, 2020 Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number Weighted Average Exercise Price Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Rollforward Weighted Average Exercise Price Outstanding, Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Weighted Average Exercise Price, Granted Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price Weighted Average Exercise Price, Exercised Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price Weighted Average Exercise Price, Cancelled Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price Weighted Average Exercise Price Outstanding, Ending Balance Weighted Average Exercise Price, Exercisable as of December 31, 2019 Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price Share based compensation arrangement by share based payment award options weighted average remaining contractual term. Weighted Average Remaining Contractual Term (In years) Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Remaining Contractual Term [Abstract] Weighted Average Remaining Contractual Term (In years), Outstanding Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 Weighted Average Remaining Contractual Term (In years), Exercisable as of December 31, 2019 Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 Share based compensation arrangement by share based payment award options aggregate intrinsic value. Aggregate Intrinsic Value Share Based Compensation Arrangement By Share Based Payment Award Options Aggregate Intrinsic Value [Abstract] Aggregate Intrinsic Value Outstanding Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value Aggregate Intrinsic Value Outstanding Aggregate Intrinsic Value, Exercisable as of December 31, 2019 Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 Estimated total grant date fair value of options vested Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Weighted Average Grant Date Fair Value Weighted average fair value options granted Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value Unrecognized stock option granted under plan Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options Unrecognized weighted average period Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 Income Tax. Income Tax. Income Tax Disclosure [Table] Income Tax Disclosure [Table] Consolidated Entities Consolidated Entities [Axis] Consolidated Entities Consolidated Entities [Domain] 89Bio Ltd. 89Bio Ltd Eighty Nine Bio Ltd [Member] Eighty Nine Bio Management, Inc. 89bio Management, Inc. Eighty Nine Bio Management Incorporation [Member] UAB Eighty Nine Bio Lithuania. UAB 89bio Lithuania U A B Eighty Nine Bio Lithuania [Member] Income Tax Disclosure [Line Items] Income Tax Disclosure [Line Items] Effective income tax rate Effective Income Tax Rate Continuing Operations Current: Current Income Tax Expense Benefit Continuing Operations [Abstract] Federal Current Federal Tax Expense Benefit State Current State And Local Tax Expense Benefit Foreign Current Foreign Tax Expense Benefit Total Current Income Tax Expense Benefit Deferred: Deferred Income Tax Expense Benefit Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense Benefit Total Deferred Income Tax Expense Benefit Income tax benefit (expense) Geographical Statement Geographical [Axis] Geographical Segment Geographical [Domain] United States UNITED STATES Israel ISRAEL Net operating loss carryforwards Deferred Tax Assets Operating Loss Carryforwards Research and development expenses Deferred Tax Assets In Process Research And Development Accrued expenses Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities Other Deferred Tax Assets Other Total deferred tax assets Deferred Tax Assets Gross Less: valuation allowance Deferred Tax Assets Valuation Allowance Net deferred tax assets Deferred Tax Assets Net Deferred tax assets, valuation allowance Deferred tax assets, change in valuation allowance Valuation Allowance Deferred Tax Asset Change In Amount Accumulated tax loss carry forward. Taxable income utilization percentage. Accumulated tax loss carryforward Accumulated Tax Loss Carry Forward Operating loss carryforwards limitations on use Operating Loss Carryforwards Limitations On Use Taxable income utilization percentage Taxable Income Utilization Percentage Deferred tax assets tax credit carryforwards research, federal. Federal research and development credit carryforwards Deferred Tax Assets Tax Credit Carryforwards Research Federal State research and development credit carryforwards Deferred Tax Assets Tax Credit Carryforwards Research Lithuania LITHUANIA Net loss before income tax Income tax reconciliation change in effective tax rate due to reorganization. Income tax reconciliation revaluation of convertible preferred share liability. Income tax benefit computed at statutory rates Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate Research and development credits, net of uncertain tax position Income Tax Reconciliation Nondeductible Expense Research And Development Change in valuation allowance Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance Change in Israel effective tax rate due to the 2019 reorganization Income Tax Reconciliation Change In Effective Tax Rate Due To Reorganization Foreign rate differential Income Tax Reconciliation Foreign Income Tax Rate Differential Revaluation of convertible preferred stock liability Income Tax Reconciliation Revaluation Of Convertible Preferred Share Liability Other Income Tax Reconciliation Other Adjustments Increase in unrecognized tax benefits Unrecognized Tax Benefits Period Increase Decrease Unrecognized Tax Benefits Unrecognized Tax Benefits Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Antidilutive Securities Antidilutive Securities Excluded From Computation Of Earnings Per Share By Antidilutive Securities [Axis] Antidilutive Securities, Name Antidilutive Securities Name [Domain] Stock Options to Purchase Common Stock Employee Stock Option [Member] Shares available for future option grants. Shares Available for Future Option Grants Shares Available For Future Option Grants [Member] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive common stock equivalents excluded from calculation of diluted net loss per share Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount