Share-based compensation arrangement by share-based payment award, other share increase (decrease) Share-based Compensation Arrangement by Share-based Payment Award, Other Share Increase (Decrease) Common Stock, shares, outstanding Shares, Outstanding, Ending Balance Shares, Outstanding, Beginning Balance Shares, Outstanding Net amortization or accretion on marketable securities Less: tenant improvement allowances Schedule of Investments [Line Items] Schedule of Investments [Table] GSK Research and Development Services Contract [Member] G S K Research and Development Services Contract [Member] GSK Research and Development Services Contract. Outpace Bio Inc [Member] Outpace Bio Inc Member Outpace Bio Inc [Member] Summary of Estimated Fair Value of Success Payment Liability Assumptions Monthly fixed rental payment proceeds. Monthly Fixed Rental Payment Proceeds Monthly fixed rental payment proceeds. Net issuance cost Temporary Equity Issuance Costs Temporary equity issuance costs. Conversion of convertible preferred stock to common stock, Shares Proceeds from initial public offering, net of issuance costs Proceeds from initial public offering, net of issuance costs, Shares Proceeds from Issuance of Initial Public Offering Net of Issuance Costs Proceeds from issuance of initial public offering net of issuance costs. Stock Issued During IPO Stock Issued During IPO Accretion (Amortization) of Discounts and Premiums, Investments Share-based Payment Arrangement, Accelerated Cost Expected term (in years) Share Based Compensation Expense Maximum offering period Share Based Compensation Arrangement By Share Based Payment Award Option maximum offering period Share Based Compensation Arrangement By Share Based Payment Award Option maximum offering period Purchase of common stock at discount Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate Percentage of Purchase of shares at fair value Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date Percentage of Common shares reserved for future issuance increase Number Of Shares As Percentage Of Common Shares Outstanding Number Of Shares As Percentage Of Common Shares Outstanding. Company's investment Preferred and common shares authorized Preferred And Common Shares Authorized Preferred And Common Shares Authorized Revenue recognized during the period previously recorded in deferred revenue Fair Value Assumptions Input Expected Terms Fair Value Assumptions Input Expected Terms Description Of Organization [Line Items] Description Of Organization [Line Items] Description of organization line Items Proceeds from initial public offering, net of underwriters' discounts and commissions Monthly fixed rental payment due Monthly Fixed Rental Payment Due Monthly Fixed Rental Payment Due Deferred offering costs included in accounts payable and accrued liabilities Deferred offering costs included in accounts payable and accrued liabilities Net cash provided by (used in) investing activities Sales of property and equipment Other comprehensive (loss) gain: Other (expense) income, net Fair value of common stock Series A convertible preferred stock Proceeds from initial public offering, net of issuance costs Proceeds from Sale of Property, Plant, and Equipment, Total Proceeds from Sale of Property, Plant, and Equipment G S K Already in Agreement [Member] Maximum potential future development and sales milestone payment. Maximum Potential Future Technology Validation Milestone Payment Repurchase of common stock, shares Maximum potential future technology validation milestone payment Maximum potential future technology validation milestone payment. Preferred Stock Preferred Stock [Member] Number of additional shares authorized for issuance Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Agreement upfront consideration Agreement upfront consideration. Transaction price, revenue contract Transaction Price For Revenue Contract Transaction price for revenue contract. Total upfront payment for collaboration agreement Up-Front Payment For Collaboration Agreement, Net Upfront payment for collaboration agreement, net. Estimated shares purchased, fair value per share Estimated Fair Value Of Shares Purchased Per Share Estimated fair value of shares purchased per share. Additional allocated upfront purchase price Additional Allocated Up-Front Payment For Collaboration Agreement Additional allocated upfront payment for collaboration agreement. Other Investments Other Investments [TextBlock] Other Investments [TextBlock]. Other Investments [Abstract] Total upfront consideration Up-Front Consideration, Net Upfront consideration, net. Repurchase of shares Estimated fair value per share Estimated Fair Value of Equity Issued in Preferred Stock Financing Per Share Estimated fair value of equity issued in preferred stock financing per share. Ownership percentage Ownership percentage of the entity by stockholder Ownership percentage of the entity by stockholder Adjustments To The Carrying Amount For Other Investments Adjustments To The Carrying Amount For Other Investment Adjustments To The Carrying Amount For Other Investment GSK License Contract [Member] GSK license contract. Revenue recognized Additional allocated upfront consideration Additional Allocated Up-Front Consideration Additional allocated up-front consideration. Share price Convertible preferred stock, shares repurchased Schedule of Potentially Dilutive Securities Strategic equity investment Equity Securities without Readily Determinable Fair Value, Amount Share price Description Of Organization [Line Items] Common Stock Including Additional Paid in Capital Common Stock Including Additional Paid in Capital [Member] Converted preferred stock Convertible Preferred Stock Converted to Other Securities Deferred revenue, net of current portion Contract with Customer, Liability, Noncurrent Operating lease liabilities, net of current portion Deferred revenue Contract with Customer, Liability, Current Common stock, par value Common Stock, Par or Stated Value Per Share Preferred stock, par value Preferred Stock, Par or Stated Value Per Share Base rent due Accrued Rent, Current Lease Expiration Date Sales and maturities of marketable securities Proceeds from Sale and Maturity of Debt Securities, Available-for-sale, Total Proceeds from Sale and Maturity of Debt Securities, Available-for-sale Purchases of marketable securities Payments to Acquire Debt Securities, Available-for-sale Accrued liabilities and other liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Changes in the Estimated Fair Value of Level 3 Financial Assets and Liabilities Contract with Customer, Liability, Revenue Recognized Changes in fair value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Balance at June 30, 2021 Balance at December 31, 2020 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Share issued price per share Common Stock Price Per Share Required For Payment Common stock price per share required for payment. Expected volatility Fair Value Assumption Expected Volatility Rate Fair value assumption expected volatility rate. Risk-free interest rate maximum Fair Value Assumptions Risk Free Interest Rate Maximum Fair value assumptions risk free interest rate maximum. Risk-free interest rate minimum Fair Value Assumptions Risk Free Interest Rate Minimum Fair value assumptions risk free interest rate minimum. Equity warrant investment Equity Warrant Investment [Member] Equity warrant investment. Purchase of common stock at discount Purchase Of Common Stock At Discount Through Payroll Deductions Purchase of common stock at discount through payroll deductions. Success payment expense Repurchase of convertible preferred stock Less: tenant improvement allowances LesseeOperatingLeaseLiabilityTenantImprovementAllowance LesseeOperatingLeaseLiabilityTenantImprovementAllowance Interest income, net Interest Income, Other License [Member] Product and Service [Domain] Product and Service [Axis] Contract liabilities Contract assets Contract with Customer, Asset, after Allowance for Credit Loss, Total Contract with Customer, Asset, after Allowance for Credit Loss Maximum potential future development and sales milestone payment G S K Not Already in Agreement [Member] G S K Not Already in Agreement [Member] G S K Not Already in Agreement [Member] G S K Already in Agreement [Member] G S K Already in Agreement [Member] Success Payment Expense Success payment expense. Net of issuance costs Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Repurchase of convertible preferred stock Collaboration agreement expense Collaboration Agreement Expense Collaboration agreement expense. Percentage of Common shares reserved for future issuance increase Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum Deferred revenue balance at December 31, 2020 Deferred revenue balance at June 30, 2021 2021 ESPP Contract with Customer, Liability, Total Contract with Customer, Liability 2021 Plan 2018 Plan Revenue Revenue from Contract with Customer [Policy Text Block] Two Thousand Twenty One Employee Stock Purchase Plan [Member] Two thousand twenty one employee stock purchase plan. Significant Accounting Policies New Accounting Pronouncements, Policy [Policy Text Block] Summary of Changes in Deferred Revenue Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Revenue recognized 2021 (remaining six months) Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Net of issuance costs Net Of Issuance Costs Net Of Issuance Costs Risk-Free Interest Rate Expected Volatility Expected Term Measurement Input, Expected Term [Member] Measurement Input, Price Volatility [Member] Measurement Input, Risk Free Interest Rate [Member] Measurement Input Type [Domain] Measurement Input Type [Axis] Issuance of common stock upon exercise of stock options, shares Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] Collaborative Arrangement and Arrangement Other than Collaborative [Table] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Other Investment. Other Investment [Member] Other Investment [Member] Shares purchased price per share. Shares Purchased Price Per Share Shares purchased price per share Shares purchased. Shares Purchased Shares purchased PACT Agreement. P A C T Agreement [Member] PACT Agreement [Member] Transaction price Revenue from Contract with Customer, Excluding Assessed Tax, Total Revenue from Contract with Customer, Excluding Assessed Tax Share issued price per share Shares, issued Shares, Issued, Ending Balance Shares, Issued, Beginning Balance Shares, Issued Rentable area Net Rentable Area Schedule of Fair Value and Amortized Cost of Cash Equivalents and Marketable Securities Lease expiration date Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Maximum Potential Future Development And Sales Milestone Payment Receivable Up Front Payment Accrued Liabilities and Other Current Liabilities [Member] Stanford collaboration agreement . Stanford Collaboration Agreement [Member] Stanford Collaboration Agreement [Member] License fees. License Fees License fees Fair value of success payments net. Fair Value Of Success Payments Net Fair value of success payments net Share price Share Price Research and development expense Research and development Fred Hutch Collaboration Agreement . Fred Hutch Collaboration Agreement [Member] Fred Hutch Collaboration Agreement [Member] Operating Lease, Liability, Noncurrent Accrued Liabilities [Member] Leland Stanford Junior University (Stanford) . Leland Stanford Junior University [Member] Stanford [Member] Fred Hutchinson Cancer Research Center [Member] Offering expenses Outstanding convertible preferred stock (in shares) Thereafter Lessee Operating Lease Liability Payments Due After Year Four Lessee Operating Lease Liability Payments Due After Year Four 2025 2024 2023 2022 Restricted Stock Aggregate success payment Aggregate Success Payment Aggregate success payment. Unvested RSAs Stock Options, Exercised Research And Development Expense Minimum Maximum Fair Value Measurements Other Assets, Noncurrent, Total Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed), Total Cash and Cash Equivalents, at Carrying Value, Ending Balance Cash and Cash Equivalents, at Carrying Value, Beginning Balance Cash and Cash Equivalents, at Carrying Value, Total Additional Paid in Capital, Common Stock, Ending Balance Additional Paid in Capital, Common Stock, Beginning Balance Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Retained Earnings (Accumulated Deficit), Total Payments to Acquire Property, Plant, and Equipment, Total Share-based Payment Arrangement, Noncash Expense, Total Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Total Preferred Stock, Value, Issued, Ending Balance Preferred Stock, Value, Issued, Beginning Balance Preferred Stock, Value, Issued, Total APIC, Share-based Payment Arrangement, Increase for Cost Recognition, Total Marketable Securities, Noncurrent, Total Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total Entity Central Index Key Entity Central Index Key Cover [Abstract] Document Type Document Type Amendment Flag Amendment Flag Current Fiscal Year End Date Current Fiscal Year End Date Document Quarterly Report Document Quarterly Report Document Transition Report Document Transition Report Entity Interactive Data Current Entity Interactive Data Current 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 File Number Entity File Number Entity Registrant Name Entity Registrant Name Entity Incorporation State Country Code Entity Incorporation State Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address Address Line1 Entity Address Address Line1 Entity Address Address Line2 Entity Address, Address Line Two 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 Noncash Or Part Noncash Acquisition Net Nonmonetary Assets Acquired Liabilities Assumed1 Non-cash expense in connection with asset acquisition Other Noncash Income Expense Other Increase Decrease In Operating Capital [Abstract] Changes in operating assets and liabilities: Increase Decrease In Prepaid Deferred Expense And Other Assets Prepaid expense and other assets Increase Decrease In Accounts Payable Accounts payable Increase Decrease In Deferred Revenue Deferred revenue Net Cash Provided By Used In Operating Activities Net cash used in operating activities Net Cash Provided By Used In Investing Activities [Abstract] CASH FLOWS FROM INVESTING ACTIVITIES Payments To Acquire Property Plant And Equipment Purchases of property and equipment Other Liabilities, Noncurrent, Total Research and Development Expense, Total Debt Securities, Available-for-sale, Total Other Nonoperating Income (Expense), Total Accounts Payable, Current, Total Accrued Liabilities and Other Liabilities, Total Increase (Decrease) in Accounts Payable, Total Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Total Payments To Acquire Other Investments Purchases of other investments Net Cash Provided By Used In Investing Activities Net Cash Provided By Used In Financing Activities [Abstract] Local Phone Number Security12b Title Security12b Title Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name 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 Success payment current liabilities. Success Payment Current Liabilities Success payment liabilities Statement Of Financial Position [Abstract] Assets [Abstract] ASSETS Assets Current [Abstract] Current assets: Cash And Cash Equivalents At Carrying Value Cash and cash equivalents Marketable Securities Current Short-term marketable securities Prepaid Expense And Other Assets Current Prepaid expenses and other current assets Assets Current Fifty Times [Member] 50x [Member] Aggregate Intrinsic Value, Outstanding Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Aggregate Intrinsic Value Aggregate Intrinsic Value, Exercisable Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Risk-free interest rate Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Expected volatility Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Minimum Expected volatility, minimum Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Maximum Expected volatility, maximum Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 Expected term (in years) Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate Expected dividend yield Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value Weighted average grant date fair value Preferred Stock Dividends Income Statement Impact Deemed dividends upon repurchase of convertible preferred stock Net Income Loss Available To Common Stockholders Basic Net loss attributed to common stockholders Earnings Per Share Basic And Diluted Net loss per common share, basic and diluted Weighted Average Number Of Share Outstanding Basic And Diluted Weighted-average shares used to compute net loss per common share, basic and diluted Stock issued during period value strategic partners. Stock Issued During Period Value Strategic Partners Issuance of common stock to strategic partners Stock repurchased convertible preferred stock during period value. Stock Repurchased Convertible Preferred Stock During Period Value Repurchase of convertible preferred stock Statement Of Stockholders Equity [Abstract] Statement [Table] Statement [Table] Statement Equity Components [Axis] Equity Components Equity Component [Domain] Equity Component Common Stock [Member] Common Stock Additional Paid In Capital [Member] Additional Paid-in Capital Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive Income Retained Earnings [Member] Accumulated Deficit Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Class of Stock Convertible Preferred Stock [Member] Convertible Preferred Stock Subsidiary Sale Of Stock [Axis] Sale of Stock Sale Of Stock Name Of Transaction [Domain] Sale of Stock I P O [Member] IPO Statement [Line Items] Statement [Line Items] Proceeds From Issuance Initial Public Offering Payments Of Stock Issuance Costs Stock Issued During Period Value Conversion Of Convertible Securities Conversion of convertible preferred stock to common stock Stock Issued During Period Value Stock Options Exercised Issuance of common stock upon exercise of stock options Stock Issued During Period Shares Stock Options Exercised Temporary Equity Stock Issued During Period Value New Issues Issuance of Series C convertible preferred stock Temporary equity stock issued during period shares, new issues. Temporary Equity Stock Issued During Period Shares New Issues Issuance of Series C convertible preferred stock, shares Stock issued during period shares strategic partners. Stock Issued During Period Shares Strategic Partners Issuance of common stock to strategic partners, shares Stock Issued During Period Value Acquisitions Issuance of common stock for asset acquisition Stock Issued During Period Shares Acquisitions Issuance of common stock for asset acquisition, shares Stock repurchased convertible preferred stock during period shares. Stock Repurchased Convertible Preferred Stock During Period Shares Repurchase of convertible preferred stock, shares Stock Repurchased During Period Value Repurchase of common stock Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Total Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total Preferred Stock, Shares Issued, Total Other Investments, Total Preferred Stock, Shares Outstanding, Ending Balance Preferred Stock, Shares Outstanding, Beginning Balance Depreciation, Depletion and Amortization, Total General and Administrative Expense, Total Other Comprehensive Income (Loss), Net of Tax, Total Increase (Decrease) in Prepaid Expense and Other Assets, Total Restricted Cash, Total Revenues, Total Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Total Marketable Securities, Current, Total Earnings Per Share, Basic and Diluted, Total Other Noncash Income (Expense), Total Operating Lease, Liability, Total Common Stock, Shares, Issued, Total Stock Repurchased During Period Shares Repurchase of common stock, shares Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Stock-based compensation Share Based Compensation Arrangement By Share Based Payment Award Shares Issued In Period Stock-based compensation, shares Other Comprehensive Income Loss Net Of Tax Other comprehensive income Fair value adjustment of success payment liabilities Fair Value Adjustment Of Success Payment Liabilities Change in fair value of success payment liabilities Non Cash Lease Expense. Non Cash Lease Expense Non-cash lease expense Remeasurement of operating lease right of use asset for lease modification. Remeasurement Of Operating Lease Right Of Use Asset For Lease Modification Remeasurement of operating lease right of use asset for lease modification Cash received for amounts related to tenant improvement allowances. Cash Received For Amounts Related To Tenant Improvement Allowances Cash received for amounts related to tenant improvement allowances Cash paid for amounts included in the measurement of lease liabilities. Cash Paid For Amounts Included In Measurement Of Lease Liabilities Cash paid for amounts included in the measurement of lease liabilities Represented by Cash and Cash Equivalents and Restricted Cash. Represented By Cash And Cash Equivalents And Restricted Cash [Abstract] Represented by: Statement Of Cash Flows [Abstract] Net Cash Provided By Used In Operating Activities [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Adjustments to reconcile net loss to net cash used in operating activities: Depreciation Depletion And Amortization Depreciation and amortization Share Based Compensation Stock-based compensation expense Fair Value Adjustment Of Warrants Change in fair value of warrants Common stock voting rights Share based compensation arrangement by share based payment award option granted period. Share Based Compensation Arrangement By Share Based Payment Award Option Granted Period Option granted period 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 [Axis] Plan Name Plan Name [Domain] Plan Name Two thousand eighteen equity incentive plan. Two Thousand Eighteen Equity Incentive Plan [Member] Two thousand twenty one equity incentive plan. Two Thousand Twenty One 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] Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 Vesting period Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized Common shares reserved for future issuance Common Stock Capital Shares Reserved For Future Issuance Initial reserved 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] General And Administrative Expense [Member] General and administrative Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] Allocated Share Based Compensation Expense Total stock-based compensation expense Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Unrecognized stock-based compensation cost (in thousands) Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 Expected weighted-average period compensation cost to be recognized (in years) Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Roll Forward RSA's Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Vested Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period Forfeited Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value Roll Forward Weighted-Average Grant Date Fair Value per Share Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value Unvested shares as of June 30, 2021 Unvested shares as of December 31, 2020 Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value Vested Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value Forfeited Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Roll Forward Stock Options Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number Stock Options Outstanding, Ending Balance Stock Options Outstanding, Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross Stock Options, Granted Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Stock Options,Canceled or forfeited Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number Stock Options Exercisable Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Rollforward Weighted-Average Exercise Price per Share Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Weighted-Average Exercise Price per Share Outstanding, Ending Balance Weighted-Average Exercise Price per Share Outstanding, Beginning Balance Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price Weighted-Average Exercise Price per Share, Granted Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price Weighted-Average Exercise Price per Share, Exercised Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price Weighted-Average Exercise Price per Share, Cancelled or forfeited Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price Weighted-Average Exercise Price Per Share Exercisable Share Based Compensation Arrangement By Share Based Payment Award Options Additional Disclosures [Abstract] Weighted-Average Remaining Contractual Life (years) Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 Weighted-Average Remaining Contractual Life (years), Outstanding Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 Weighted-Average Remaining Contractual Life (years), Exercisable Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest [Abstract] Aggregate Intrinsic Value Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Aggregate Intrinsic Value 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 Excluded From Computation Of Earnings Per Share By Antidilutive Securities [Axis] Antidilutive Securities Antidilutive Securities Name [Domain] Antidilutive Securities, Name Employee Stock Option [Member] Options Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Anti-dilutive securities excluded from computation of dilutive net loss per share RelatedPartyTransactionsTextualAbstract Related Party Transactions Textual [Abstract] Schedule Of Related Party Transactions By Related Party [Table] Schedule Of Related Party Transactions By Related Party [Table] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Equity Method Investment Ownership Percentage Equity holder Leases [Abstract] Lessee Operating Leases [Text Block] Leases Stockholders Equity Note [Abstract] Total current assets Restricted Cash Restricted cash Marketable Securities Noncurrent Long-term marketable securities Other Investments Other investments Property Plant And Equipment Net Property and equipment, net Operating Lease Right Of Use Asset Right-of-use assets, net Other Assets Noncurrent Other non-current assets Assets Total assets Liabilities And Stockholders Equity [Abstract] LIABILITIES, CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' DEFICIT Liabilities Current [Abstract] Current liabilities: Accounts Payable Current Accounts payable Accrued Liabilities And Other Liabilities Accrued liabilities and other current liabilities Liabilities Current Total current liabilities Operating Lease Liability Current Operating lease liabilities, net of current portion Other Liabilities Noncurrent Other non-current liabilities Liabilities Total liabilities Commitments And Contingencies Commitments and contingencies (Note 12) Temporary Equity Carrying Amount Attributable To Parent Ending balance Beginning balance Convertible preferred stock, $0.0001 par value; no and 195,021 shares authorized at June 30, 2021 and December 31, 2020, respectively; no and 194,474 shares were issued and outstanding at June 30, 2021 and at December 31, 2020, respectively Stockholders Equity Including Portion Attributable To Noncontrolling Interest [Abstract] Stockholders' deficit: Preferred Stock Value Preferred stock: $0.0001 par value, 0 and no shares authorized at June 30, 2021 and December 31, 2020, respectively; no shares issued and outstanding at June 30, 2021 and December 31, 2020 Preferred stock, shares authorized Preferred Stock Shares Issued Preferred stock, shares issued Preferred Stock Shares Outstanding Preferred stock, shares outstanding Common Stock Shares Authorized Common stock, shares authorized Common Stock Shares Issued Common stock, shares, issued Common Stock Shares Outstanding Ending balance, (in shares) Beginning balance, (in shares) Common Stock, shares, outstanding Other operating income, net. Other Operating Income Net Other operating income, net Statement Of Income And Comprehensive Income [Abstract] Revenues Revenue Operating Expenses [Abstract] Operating expenses (income): Research And Development Expense General And Administrative Expense General and administrative Operating Expenses Total operating expenses Operating Income Loss Loss from operations Other Nonoperating Income Expense Net Income Loss Net loss Net loss Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax Net unrealized gain (loss) on marketable securities Comprehensive Income Net Of Tax Net comprehensive loss Net Income Loss Available To Common Stockholders Operations Basic [Abstract] Net loss attributed to common stockholders: Balance Sheet Location [Domain] Balance Sheet Location Other Noncurrent Assets [Member] Other Noncurrent Assets Deferred Offering Costs Deferred offering costs Range [Axis] Statistical Measurement Range [Member] Statistical Measurement Minimum [Member] Maximum [Member] GSK Agreement G S K Agreement [Member] GSK Agreement [Member] Income Statement Location [Axis] Income Statement Location Income Statement Location [Domain] Income Statement Location Research And Development Expense [Member] Investment Type [Axis] Investment Type Investment Type Categorization [Member] Investments Shares Issued Price Per Share Share price Multiple of initial equity value at issuance. Multiple Of Initial Equity Value At Issuance Multiple of initial equity value at issuance Equity Multiple Axis. Equity Multiple [Axis] Equity Multiple Equity Multiple Domain. Equity Multiple [Domain] Equity Multiple Ten Times (10x). Ten Times [Member] 10x [Member] Twenty Times (20x). Twenty Times [Member] 20x [Member] Thirty Times (30x). Thirty Times [Member] 30x [Member] Forty Times (40x). Forty Times [Member] 40x [Member] Fifty Times (50x). Preferred Stock [Text Block] Convertible Preferred Stock Equity [Abstract] Stockholders Equity Note Disclosure [Text Block] Common Stock Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Stock-Based Compensation Earnings Per Share [Abstract] Earnings Per Share [Text Block] Net Loss Per Share Commitments And Contingencies Disclosure [Abstract] Commitments And Contingencies Disclosure [Text Block] Commitments and Contingencies Related Party Transactions [Abstract] Related Party Transactions Disclosure [Text Block] Related Party Transactions Subsequent Events [Abstract] Subsequent Events [Text Block] Subsequent Events Basis Of Accounting Policy Policy [Text Block] Basis of Presentation Use Of Estimates Use of Estimates Unaudited condensed consolidated financial statements policy text block. Unaudited Condensed Consolidated Financial Statements Policy [Text Block] Unaudited Condensed Consolidated Financial Statements Concentration Risk Credit Risk Concentrations of Credit Risk and Off-Balance Sheet Risk The entire disclosure of potential success payments . Schedule Of Aggregate Potential Success Payments Table [Text Block] Schedule of Aggregate Potential Success Payments Related Party Transactions By Related Party [Axis] Related Party Related Party [Domain] Related Party Fred Hutchinson Cancer Research Center [Member] Fred Hutch [Member] Fair Value By Liability Class [Axis] Liability Class Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation By Liability Class [Domain] Fair Value by Liability Class Fred Hutch Fred Hutch [Member] Fred Hutch Stanford. Stanford [Member] Stanford Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis Table [Text Block] Financial Assets and Liabilities Measured at Fair Value on Recurring Basis Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques Table [Text Block] Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Text Block] Schedule Of Future Minimum Rental Payments For Operating Leases Table [Text Block] Summary of Operating Lease Commitments Including Expected Lease Incentives to be Received Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Text Block] Schedule of Stock-Based Compensation Expense by Classification Schedule Of Unrecognized Compensation Cost Nonvested Awards Table [Text Block] Schedule of Stock-Based Compensation Costs Related to Unvested Awards and Weighted-Average Period Over Which Costs are Expected to be Recognized Nonvested Restricted Stock Shares Activity Table [Text Block] Summary of RSA Activity Schedule Of Share Based Compensation Stock Options Activity Table [Text Block] Summary of Stock Option Activity Schedule Of Share Based Payment Award Stock Options Valuation Assumptions Table [Text Block] Schedule of Assumptions Used in Black-Scholes Option-Pricing Model for Estimating Fair Value of Stock Options Granted Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Text Block] Payments of underwriting Discounts and commissions Payments Of Underwriting Discounts And Commissions Payments of underwriting discounts and commissions Organization Consolidation And Presentation Of Financial Statements [Abstract] Description of organization table Description Of Organization [Table] Description Of Organization [Table] Stock Issued During Period Shares New Issues Issuance of common stock, shares Sale Of Stock Price Per Share Common stock price per share Stock Issued During Period Shares Conversion Of Convertible Securities Conversion of preferred stock into common stock (in shares) Balance Sheet Location [Axis] Balance Sheet Location Marketable Securities [Table] Marketable Securities [Table] Cash And Cash Equivalents [Axis] Cash and Cash Equivalents Restricted Cash And Cash Equivalents Cash And Cash Equivalents [Member] Cash and Cash Equivalents Money Market Funds [Member] Money Market Funds [Member] Financial Instrument [Axis] Financial Instrument Transfers And Servicing Of Financial Instruments Types Of Financial Instruments [Domain] Financial Instruments U S Treasury Securities [Member] U.S. Treasury Securities [Member] U S Government Agencies Debt Securities [Member] U.S. Government Agency Securities [Member] Corporate Debt Securities [Member] Corporate Debt Securities [Member] Cash Equivalents [Member] Cash Equivalents [Member] Short Term Investments [Member] Short-term Marketable Securities [Member] Long-term marketable securities. Common Stock Value Common stock, $0.0001 par value; 264,905 shares authorized at June 30, 2021 and December 31, 2020, respectively; 15,570 and 15,570 shares issued and outstanding at June 30, 2021 and December 31, 2020, respectively Additional Paid In Capital Common Stock Additional paid-in capital Accumulated Other Comprehensive Income Loss Net Of Tax Accumulated other comprehensive income Retained Earnings Accumulated Deficit Accumulated deficit Stockholders Equity Ending balance Beginning balance Total stockholders' deficit Liabilities And Stockholders Equity Total liabilities, convertible preferred stock and stockholders' deficit Temporary Equity Par Or Stated Value Per Share Convertible preferred stock, par value Temporary Equity Shares Authorized Convertible preferred stock, shares authorized Temporary Equity Shares Issued Convertible preferred stock, shares issued Temporary Equity Shares Outstanding Ending balance, (in shares) Beginning balance, (in shares) Preferred Stock Shares Authorized CASH FLOWS FROM FINANCING ACTIVITIES Proceeds From Issuance Of Convertible Preferred Stock Proceeds from issuance of convertible preferred stock, net of issuance costs Proceeds From Stock Options Exercised Proceeds from exercise of stock options Payments For Repurchase Of Common Stock Payments for the repurchase of common stock Payments for the repurchase of common stock Payments For Repurchase Of Preferred Stock And Preference Stock Payments for the repurchase of preferred stock Net Cash Provided By Used In Financing Activities Net cash provided by financing activities Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect Net increase in cash, cash equivalents and restricted cash Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Cash, cash equivalents and restricted cash at end of period Cash, cash equivalents and restricted cash at beginning of period Supplemental Cash Flow Information [Abstract] SUPPLEMENTAL CASH FLOW INFORMATION Conversion Of Stock Amount Converted1 Conversion of convertible preferred stock to common stock upon closing of initial public offering Capital Expenditures Incurred But Not Yet Paid Purchases of property and equipment included in accounts payable and accrued liabilities Right Of Use Asset Obtained In Exchange For Operating Lease Liability Operating lease right-of-use assets obtained in exchange for lease obligations Accounting Policies [Abstract] Nature Of Operations Organization Organization Consolidation And Presentation Of Financial Statements Disclosure And Significant Accounting Policies [Text Block] Basis of Presentation and Significant Accounting Policies The entire disclosure of collaboration, license and success payment agreements. Collaboration License And Success Payment Agreements [Text Block] Collaboration License and Success Payment Agreements Collaboration License and Success Payment Agreements. 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Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer. Series A A Preferred Stock [Member] Series AA Preferred Stock Payments For Repurchase Of Convertible Preferred Stock Purchase price for repurchase of convertible preferred stock Convertible Preferred Stock Shares Issued Upon Conversion Outstanding shares of convertible preferred stock converted into shares of common stock Schedule Of Stock By Class [Table] Schedule Of Stock By Class [Table] Award Type [Axis] Award Type Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Award Type Related party. Related Party [Member] Related Party Class Of Stock [Line Items] Class Of Stock [Line Items] Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Unvested shares as of June 30, 2021 Unvested shares as of December 31, 2020 Common stock outstanding Common Stock Voting Rights Long Term Marketable Securities [Member] Long-term Marketable Securities [Member] Marketable Securities [Line Items] Marketable Securities [Line Items] Available For Sale Debt Securities Amortized Cost Basis Amortized Cost Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax Gross Unrealized Holding Gains Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax Gross Unrealized Holding Losses Available For Sale Securities Debt Securities Fair Value Available For Sale Securities Continuous Unrealized Loss Position Fair Value Fair value of securities in unrealized loss position Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value Securities, continuous unrealized loss position, less than twelve months, fair value Marketable securities maturity period. 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Fair Value Of Series A Convertible Preferred Stock Success payment liabilities Member Success Liabilities [Member] Success Liabilities Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value Balance at June 30, 2021 Balance at December 31, 2020 Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings Change in fair value Lessee Operating Lease Liability Payments Due Next Twelve Months Lessee Operating Lease Liability Payments Due Year Two Lessee Operating Lease Liability Payments Due Year Three Lessee Operating Lease Liability Payments Due Year Four Lessee Operating Lease Liability Payments Due Total undiscounted lease payments Lessee Operating Lease Liability Undiscounted Excess Amount Less: imputed interest Operating Lease Liability Total operating lease liabilities Operating Lease Cost Operating lease cost Variable Lease Cost Variable lease cost Series C Convertible Preferred Stock