Entity Central Index Key Lessee operating lease liability payments due after year four. Lessee Operating Tenant Improvement Receivable. 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 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 Current Fiscal Year End Date Current Fiscal Year End Date Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current 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 Title of 12(b) Security Security12b Title Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Document Quarterly Report Document Quarterly Report Document Transition Report Document Transition Report Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Deferred rent and other lease liabilities current. Deferred rent and other lease liabilities 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 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 Operating lease right-of-use assets Operating Lease Right Of Use Asset Restricted cash, non-current Restricted Cash Noncurrent Other non-current assets Other Assets Noncurrent Total assets Assets LIABILITIES, CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ DEFICIT Liabilities And Stockholders Equity [Abstract] Current liabilities: Liabilities Current [Abstract] Accounts payable Accounts Payable Current Accrued expenses and other current liabilities Accrued Liabilities Current Deferred rent and other lease liabilities, current Deferred Rent And Other Lease Liabilities Current Operating lease liabilities, current Operating Lease Liability Current Total current liabilities Liabilities Current Deferred rent and other lease liabilities, non-current Deferred Rent And Other Lease Liabilities Noncurrent Operating lease liabilities, non-current Operating Lease Liability Noncurrent Other non-current liabilities Other Liabilities Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 6) Commitments And Contingencies Convertible preferred stock Temporary Equity Carrying Amount Attributable To Parent Stockholders’ deficit: Stockholders Equity [Abstract] Common stock Common Stock Value Additional paid-in capital Additional Paid In Capital Notes receivable from stockholders Stockholders Equity Note Subscriptions Receivable Accumulated deficit Retained Earnings Accumulated Deficit Total stockholders’ deficit Stockholders Equity Total liabilities, convertible preferred stock and stockholders’ deficit Liabilities And Stockholders Equity Change in fair value of convertible preferred stock tranche liability. 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 income (expense), net: Nonoperating Income Expense [Abstract] Interest income Investment Income Interest Change in fair value of convertible preferred stock tranche liability Change In Fair Value Of Convertible Preferred Stock Tranche Liability Other income (expense), net Other Nonoperating Income Expense Total other income (expense), net Nonoperating Income Expense Net loss before income tax expense Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Income tax expense Income Tax Expense Benefit Net loss and comprehensive loss Net Income Loss Net loss per share, basic and diluted Earnings Per Share Basic And Diluted Weighted-average shares used in computing 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. Vesting of early exercised stock options. Notes receivable from stockholders. 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] Notes Receivable from Stockholders Receivables From Stockholder [Member] Accumulated Deficit Retained Earnings [Member] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Convertible Preferred Stock Convertible Preferred Stock [Member] Series C convertible preferred stock. Series C Convertible Preferred Stock Series C Convertible Preferred Stock [Member] Series B convertible preferred stock. Series B Convertible Preferred Stock Series B Convertible Preferred Stock [Member] Statement [Line Items] Statement [Line Items] Temporary equity balance, shares Temporary Equity Shares Outstanding Temporary equity, balance Balance, shares Shares Outstanding Balance 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 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 Repurchase of common stock related to early exercise of options Stock Repurchased During Period Value Repurchase of common stock related to early exercise of options, shares Stock Repurchased During Period Shares Vesting of early exercised stock options Vesting Of Early Exercised Stock Options Notes receivable from stockholders Notes Receivable From Stockholders Stock-based compensation Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Net loss and other comprehensive loss Balance Temporary equity balance, shares Temporary equity, balance Balance, shares Partial settlement of stock, tranche liability. Stock issuance costs Payments Of Stock Issuance Costs Partial settlement of stock, tranche liability Partial Settlement Of Stock Tranche Liability Non-cash operating lease expense. Increase (decrease) in prepaid expense and other current assets. Increase (decrease) in accrued liabilities and other current liabilities. Increase decrease in deferred rent and other lease liabilities. Proceeds from repayments on notes receivable from stockholders. Deferred offering costs related to initial public offering included in accounts payable. Statement Of Cash Flows [Abstract] 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 and amortization Depreciation Depletion And Amortization Stock-based compensation Share Based Compensation Loss on disposal of property and equipment Gain Loss On Disposition Of Assets Non-cash operating lease expense Non Cash Operating Lease Expense Change in fair value of convertible preferred stock tranche liability Changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Prepaid expenses and other current assets Increase Decrease In Prepaid Expense And Other Current Assets Other non-current assets Increase Decrease In Other Noncurrent Assets Accounts payable Increase Decrease In Accounts Payable Accrued expenses and other current liabilities Increase Decrease In Accrued Liabilities And Other Current Liabilities Deferred rent and other lease liabilities Increase Decrease In Deferred Rent And Other Lease Liabilities Operating lease liabilities Increase Decrease In Operating Lease Liability Other non-current liabilities Increase Decrease In Other Noncurrent 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 property and equipment Payments To Acquire Property Plant And Equipment Proceeds from maturities of marketable securities Proceeds From Sale And Maturity Of Marketable Securities Net cash (used in) provided by 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 convertible preferred stock, net of issuance costs Proceeds From Issuance Of Convertible Preferred Stock Proceeds from exercise of stock options Proceeds From Stock Options Exercised Repurchases of common stock Payments For Repurchase Of Common Stock Proceeds from repayments on notes receivable from stockholders Proceeds From Repayments On Notes Receivable From Stockholders Payment of deferred offering costs Payments Of Debt Restructuring Costs Net cash provided by financing activities Net Cash Provided By Used In Financing Activities Net change in cash, 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 Including Disposal Group And Discontinued Operations Cash and cash equivalents and restricted cash at end of period Components of cash, cash equivalents and restricted cash: Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations [Abstract] Cash, cash equivalents and restricted cash Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Supplemental disclosure of cash operating activities: Supplemental Cash Flow Information [Abstract] Cash paid for leases included in operating cash outflows Operating Lease Payments Supplemental disclosure of non-cash operating activities: Supplemental Cash Flow Elements [Abstract] Lease liability obtained in exchange for right-of-use asset Right Of Use Asset Obtained In Exchange For Operating Lease Liability Supplemental disclosure of non-cash investing and financing activities: Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract] Deferred offering costs related to initial public offering included in accounts payable and accrued expenses and other current liabilities Deferred Offering Costs Related To Initial Public Offering Included In Accounts Payable Property and equipment included in accounts payable and accrued expenses and other current liabilities Capital Expenditures Incurred But Not Yet Paid Partial settlement of convertible preferred stock tranche liability in connection with the issuance of Series B convertible preferred stock Stock Issued1 Organization Consolidation And Presentation Of Financial Statements [Abstract] Organization and Description of the Business 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] Balance Sheet Components Supplemental Balance Sheet Disclosures [Text Block] License agreements. License Agreements [Abstract] License Agreements Collaborative Arrangement Disclosure [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Convertible preferred stock. Temporary Equity Disclosure [Abstract] Convertible Preferred Stock Convertible Preferred Stock [Text Block] Equity [Abstract] 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] 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 Events Subsequent Events [Text Block] Basis of Presentation Basis Of Accounting Policy Policy [Text Block] Use of Estimates Use Of Estimates Cash and Cash Equivalents Cash And Cash Equivalents Policy [Text Block] Leases Lessee Leases Policy [Text Block] Deferred offering costs. Deferred Offering Costs Deferred Offering Costs Policy [Text Block] Net Loss Per Share Earnings Per Share Policy [Text Block] Recently Adopted Accounting Standards and Recently Issued Accounting Pronouncements Not Yet Adopted New Accounting Pronouncements Policy Policy [Text Block] Summary of Fair Value of Financial Assets Measured at Fair Value on Recurring Basis Fair Value Liabilities Measured On Recurring Basis [Text Block] Summary of Significant Unobservable Assumptions used to Convertible Preferred Stock Tranche Liability Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques Table [Text Block] Summary of Changes in Estimated Fair Value Liabilities Measures at Fair Value on a Recurring Basis Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Text Block] Summary of Property and Equipment, Net Property Plant And Equipment [Text Block] Summary of Accrued Expenses and Other Current Liabilities Schedule Of Accounts Payable And Accrued Liabilities Table [Text Block] Summary of Undiscounted Future Minimum Lease Payments Due Under Non-cancelable Operating Lease Lessee Operating Lease Liability Maturity Table [Text Block] Summary of Undiscounted Future Minimum Lease Payments Due Under Non-cancelable Operating Lease Schedule Of Future Minimum Rental Payments For Operating Leases Table [Text Block] Schedule of Convertible Preferred Stock Temporary Equity Table [Text Block] Schedule of common stock reserved for issuance. Schedule of Common Stock Reserved for Issuance Schedule Of Common Stock Reserved For Issuance Table [Text Block] Summary of Stock Option Activity Schedule Of Share Based Compensation Stock Options Activity Table [Text Block] Summary of Stock-based Compensation Schedule Of Share Based Compensation Activity Table [Text Block] Summary of Fair Value of Stock Option Awards Schedule Of Share Based Payment Award Stock Options Valuation Assumptions Table [Text Block] Summary of Restricted Stock Activity Schedule Of Share Based Compensation Restricted Stock Units Award Activity Table [Text Block] Schedule of Antidilutive Securities Excluded from Computation of Diluted Net Loss Per Share Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Text Block] Organization and description of business. Organization and description of business. Organization And Description Of Business [Table] Organization And Description Of Business [Table] Subsequent Event Type Subsequent Event Type [Axis] Subsequent Event Type Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Sale of Stock Subsidiary Sale Of Stock [Axis] Sale of Stock Sale Of Stock Name Of Transaction [Domain] IPO I P O [Member] Overallotment Option Over Allotment Option [Member] Organization And Description Of Business [Line Items] Organization And Description Of Business [Line Items] Reverse stock split description Stockholders Equity Reverse Stock Split Reverse stock split Stockholders Equity Note Stock Split Conversion Ratio1 Underwriting discounts and commissions. Other offering expenses. Issuance of common stock Stock Issued During Period Shares New Issues Share price Share Price Net proceeds of after deducting underwriting discounts and commissions Proceeds From Issuance Initial Public Offering Underwriting discounts and commissions Underwriting Discounts And Commissions Other offering expenses Other Offering Expenses Conversion of outstanding shares of convertible preferred stock Conversion Of Stock Shares Converted1 Net loss Significant accounting policies. Significant accounting policies. Significant Accounting Policies [Table] Significant Accounting Policies [Table] Balance Sheet Location Balance Sheet Location [Axis] Balance Sheet Location Balance Sheet Location [Domain] Other Non-Current Assets Other Noncurrent Assets [Member] Accounting Standards Update Adjustments For New Accounting Pronouncements [Axis] Accounting Standards Update Type Of Adoption [Member] ASC 842 Accounting Standards Update201602 [Member] Significant Accounting Policies [Line Items] Significant Accounting Policies [Line Items] Deferred offering costs capitalized Deferred Offering Costs Derecognized deferred rent and other lease liabilities. Operating lease liabilities Operating Lease Liability Derecognized deferred rent and other lease liabilities Derecognized Deferred Rent And Other Lease Liabilities Accounting standards update, adopted [true false] Change In Accounting Principle Accounting Standards Update Adopted Accounting standards update, adoption date Change In Accounting Principle Accounting Standards Update Adoption Date 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] Fair Value, Measurements, Recurring Fair Value Measurements Recurring [Member] Cash and Cash Equivalents Cash And Cash Equivalents [Axis] Cash and Cash Equivalents Restricted Cash And Cash Equivalents Cash And Cash Equivalents [Member] Money Market Funds Money Market Funds [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] 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] Amortized Cost Available For Sale Debt Securities Amortized Cost Basis Unrealized Gain Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax Unrealized Loss Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax Fair Value Available For Sale Securities Debt Securities Unrealized losses Convertible preferred stock tranche liability. Convertible preferred stock tranche liability Convertible Preferred Stock Tranche Liability Measurement Input Type Measurement Input Type [Axis] Measurement Input Type Measurement Input Type [Domain] Term to Valuation Date Measurement Input Expected Term [Member] Discount rate Measurement Input Discount Rate [Member] 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 tranche liability. Convertible Preferred Stock Tranche Liability Convertible Preferred Stock Tranche Liability [Member] Term to valuation date (in years) Debt Securities Available For Sale Term Measurement input Derivative Liability Measurement Input Level 3 Fair Value Inputs Level3 [Member] Beginning balance Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value Partial settlement upon second closing of Series B convertible preferred stock Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements Change in fair value upon remeasurement Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings Ending balance Schedule Of Property Plant And Equipment [Table] Schedule Of Property Plant And Equipment [Table] Long-Lived Tangible Asset Property Plant And Equipment By Type [Axis] Long-Lived Tangible Asset Property Plant And Equipment Type [Domain] Construction in Progress Construction In Progress [Member] Laboratory Equipment Equipment [Member] Leasehold Improvements Leasehold Improvements [Member] Furniture and Fixtures Furniture And Fixtures [Member] Computer Equipment and Software Software Development [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 and amortization Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Total property and equipment, net Depreciation and amortization expense Depreciation And Amortization Accrued compensation and related expenses. Accrued research and development expenses. Accrued property and equipment. Accrued compensation and related expenses Accrued Compensation And Related Expenses Accrued professional services Accrued Professional Fees Current Accrued research and development expenses Accrued Research And Development Expenses Accrued property and equipment Accrued Property And Equipment Other current liabilities Other Liabilities Current Total accrued expenses and other current liabilities Annual license maintenance fees. Milestone payments contingent upon achieving specific clinical and commercialization milestone events. Milestone obligation amount. Number of additional option to extend milestone payment. Milestone obligation additional extended payment term. Milestone and royalty payments. Schedule Of Collaborative Arrangements And Noncollaborative Arrangement Transactions [Table] Schedule Of Collaborative Arrangements And Noncollaborative Arrangement Transactions [Table] Counterparty Name Counterparty Name [Axis] Counterparty Name Repurchase Agreement Counterparty Name [Domain] Gladstone. Gladstone Gladstone [Member] Collaborative Arrangement and Arrangement Other than Collaborative Type Of Arrangement [Axis] Collaborative Arrangement and Arrangement Other than Collaborative Arrangements And Nonarrangement Transactions [Member] Gladstone license agreement Gladstone License Agreement Gladstone License Agreement [Member] Statistical Measurement Range [Axis] Statistical Measurement Range [Member] Minimum Minimum [Member] Maximum Maximum [Member] University of Texas southwestern license agreement. University of Texas Southwestern License Agreement University Of Texas Southwestern License Agreement [Member] Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] Annual license maintenance fees Annual License Maintenance Fees Milestone payments for royalty-bearing products contingent upon achieving specific clinical and commercialization milestone events Milestone Payments Contingent Upon Achieving Specific Clinical And Commercialization Milestone Events Milestone and royalty payments recognized Milestone And Royalty Payments Milestone obligation amount Milestone Obligation Amount Number of additional option to extend milestone payment Number Of Additional Option To Extend Milestone Payment Milestone obligation additional extended payment terms Milestone Obligation Additional Extended Payment Term Non-refundable upfront license fee. Milestone payments contingent upon achieving specific development and commercialization milestone events. Non-refundable upfront license fee Non Refundable Upfront License Fee Milestone payments contingent upon achieving specific development and commercialization milestone events Milestone Payments Contingent Upon Achieving Specific Development And Commercialization Milestone Events Research and development expense related to upfront license fee payable Lease Expiration month and year. Tenant improvement allowance. Number of lessee lease renewal term. Commitments and contingencies. Commitments and contingencies. Commitments And Contingencies [Table] Commitments And Contingencies [Table] Office and laboratory space. Office and Laboratory Space Office And Laboratory Space [Member] Geographical Statement Geographical [Axis] Geographical Segment Geographical [Domain] South San Francisco, California. South San Francisco, California South San Francisco California [Member] Additional office and laboratory space. Additional Office and Laboratory Space Additional Office And Laboratory Space [Member] Manufacturing and office space. Manufacturing and Office Space Manufacturing And Office Space [Member] Union City, California. Union City, California Union City California [Member] Income Statement Location Income Statement Location [Axis] Income Statement Location Income Statement Location [Domain] Other Income (Expense), Net Other Nonoperating Income Expense [Member] Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Lease expiration month and year Lease Expiration Month And Year Lease renewal term Lessee Operating Lease Renewal Term Number of lease renewal term Number Of Lease Renewal Term Tenant improvement allowance Tenant Improvement Allowance Lease Expiration Date Lease Expiration Date1 Lessee operating lease commenced. Lease commenced month and year Lessee Operating Lease Commenced Term of lease Lessee Operating Lease Term Of Contract Security deposit Security Deposit Remaining weighted-average lease term Lessee Operating Lease Remaining Lease Term Weighted-average incremental borrowing rate used to determine operating lease liability Operating Lease Weighted Average Discount Rate Percent Rent expense Operating Lease Expense Short-term lease Short Term Lease Cost Variable lease payments Variable Lease Cost 2021 (remaining 6 months) Lessee Operating Lease Liability Payments Remainder Of Fiscal Year 2022 Lessee Operating Lease Liability Payments Due Next Twelve Months 2023 Lessee Operating Lease Liability Payments Due Year Two 2024 Lessee Operating Lease Liability Payments Due Year Three 2025 Lessee Operating Lease Liability Payments Due Year Four Thereafter Lessee Operating Lease Liability Payments Due After Year Four Total undiscounted future minimum lease payments Lessee Operating Lease Liability Payments Due Present value adjustment for minimum lease commitments Lessee Operating Lease Liability Undiscounted Excess Amount Tenant improvement receivable Lessee Operating Tenant Improvement Receivable 2021 Operating Leases Future Minimum Payments Remainder Of Fiscal Year 2022 Operating Leases Future Minimum Payments Due Current 2023 Operating Leases Future Minimum Payments Due In Two Years 2024 Operating Leases Future Minimum Payments Due In Three Years 2025 Operating Leases Future Minimum Payments Due In Four Years Total future minimum lease payments Operating Leases Future Minimum Payments Due Sublease agreements expiration date. Sublease Income Sublease Income Sublease agreements expiration date Sublease Agreements Expiration Date Temporary Equity By Class Of Stock [Table] Temporary Equity By Class Of Stock [Table] Series A convertible preferred stock. Series A Convertible Preferred Stock Series A Convertible Preferred Stock [Member] Temporary Equity [Line Items] Temporary Equity [Line Items] Shares Authorized Temporary Equity Shares Authorized Shares Issued Temporary Equity Shares Issued Shares Outstanding Net Carrying Value Liquidation Preference Temporary Equity Liquidation Preference Temporary equity share purchase price per share. Series B preferred stock purchase agreement. Series B Preferred Stock Purchase Agreement Series B Preferred Stock Purchase Agreement [Member] Series C preferred stock purchase agreement. Series C Preferred Stock Purchase Agreement Series C Preferred Stock Purchase Agreement [Member] Convertible preferred stock, shares authorized Convertible preferred stock purchase price per share Temporary Equity Share Purchase Price Per Share Convertible preferred stock shares issued Fair value of convertible preferred stock tranche liability. Fair value of convertible preferred stock tranche liability Fair Value Of Convertible Preferred Stock Tranche Liability Reclassification of balance liability to convertible preferred stock. Reclassification of balance liability to convertible preferred stock Reclassification Of Balance Liability To Convertible Preferred Stock Number of closings. Number of closings Number Of Closings Schedule Of Stock By Class [Table] Schedule Of Stock By Class [Table] Award Type Award Type [Axis] Award Type Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Early exercised stock options and restricted stock that are unvested and subject to repurchase. Early Exercised Stock Options and Restricted Stock That are Unvested and Subject to Repurchase Early Exercised Stock Options And Restricted Stock That Are Unvested And Subject To Repurchase [Member] Class Of Stock [Line Items] Class Of Stock [Line Items] Common stock voting rights Common Stock Voting Rights Common stock outstanding Common Stock Shares Outstanding Conversion of outstanding shares of convertible preferred stock. Conversion of Outstanding Shares of Convertible Preferred Stock Conversion Of Outstanding Shares Of Convertible Preferred Stock [Member] Stock options issued and outstanding. Stock Options Issued and Outstanding Stock Options Issued And Outstanding [Member] Stock Options Available for Future Grant Employee Stock Option [Member] Common stock reserved for issuance Common Stock Capital Shares Reserved For Future 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] Two thousand and sixteen equity incentive plan. 2016 Equity Incentive Plan Two Thousand And Sixteen Equity Incentive Plan [Member] Restricted Stock Restricted Stock [Member] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Shares reserved, available for grant Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant Number of Options Outstanding, Outstanding Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number Number of Options Outstanding, Options granted Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross Number of Options Outstanding, Options exercised Number of Options Outstanding, Options cancelled Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Number of Options Outstanding, Outstanding Ending Balance Number of Options Outstanding, Exercisable as of June 30, 2021 Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number Weighted-Average Exercise Price Per Share, Outstanding Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Weighted-Average Exercise Price Per Share, Options granted Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price Weighted-Average Exercise Price Per Share, Options exercised Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price Weighted-Average Exercise Price Per Share, Options cancelled Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price Weighted-Average Exercise Price Per Share, Outstanding Ending Balance Weighted-Average Exercise Price Per Share, Exercisable as of June 30, 2021 Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price Weighted-Average Remaining Contractual Life, Outstanding Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 Weighted-Average Remaining Contractual Life, Exercisable as of June 30, 2021 Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 Aggregate Intrinsic Value, Outstanding Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value Aggregate Intrinsic Value, Exercisable as of June 30, 2021 Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 Research and Development Research And Development Expense [Member] General and Administrative General And Administrative Expense [Member] Total stock-based compensation Allocated Share Based Compensation Expense Unrecognized stock-based compensation Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options Weighted-average period Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 Expected term (in years) Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 Expected volatility Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate 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 Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate 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 yield Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate Share-based compensation arrangement by share-based payment award equity instruments other than options repurchased in period. Number of Shares Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Roll Forward Unvested as of December 31, 2020 Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Granted Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Vested Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Repurchased Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Repurchased In Period Unvested as of June 30, 2021 Share-based compensation arrangement by share-based payment Award equity instruments other than options repurchased in period weighted average grant date fair value. Weighted Average Fair Value at Date of Grant per Share Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value Roll Forward Unvested as of December 31, 2020 Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value Granted Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value Vested Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value Repurchased Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Repurchased In Period Weighted Average Grant Date Fair Value Unvested as of June 30, 2021 Share-based compensation arrangement by share-based payment award repurchased unvested shares terminated. Share based compensation arrangement by share based payment award principal and accrued interest amount. Repurchase unvested shares after unemployment, terminated Share Based Compensation Arrangement By Share Based Payment Award Repurchased Unvested Shares Terminated Principal and accrued interest amount Share Based Compensation Arrangement By Share Based Payment Award Principal And Accrued Interest Amount 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] Series B convertible preferred stock issuable in a future closing. Series B Convertible Preferred Stock Issuable in a Future Closing Series B Convertible Preferred Stock Issuable In Future Closing [Member] Outstanding stock options. Outstanding Stock Options Outstanding Stock Options [Member] Restricted Stock Subject to Future Vesting Restricted Stock Units R S U [Member] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Potentially dilutive securities were not included in the calculation of diluted net loss per share Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Subsequent Event [Table] Subsequent Event [Table] Two thousand twenty one equity incentive award plan. 2021 Equity Incentive Award Plan Two Thousand Twenty One Equity Incentive Award Plan [Member] Employee Stock Purchase Plan Employee Stock [Member] Subsequent Event [Line Items] Subsequent Event [Line Items]