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 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 ICFR Auditor Attestation Flag Icfr Auditor Attestation Flag Statement Of Financial Position [Abstract] Assets Assets [Abstract] Current assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Short-term investments Marketable Securities Current Prepaid expenses and other current assets Prepaid Expense And Other Assets Current Total current assets Assets Current Property and equipment, net Property Plant And Equipment Net Other assets Other Assets Noncurrent Total assets Assets Liabilities, Convertible Preferred Stock and Stockholders' Equity (Deficit) Liabilities And Stockholders Equity [Abstract] Current liabilities: Liabilities Current [Abstract] Accounts payable Accounts Payable Current Accrued liabilities Accrued Liabilities Current Total current liabilities Liabilities Current Deferred rent - long term Deferred Rent Credit Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 11) Commitments And Contingencies Convertible preferred stock: Temporary Equity [Abstract] Convertible preferred stock, $0.0001 par value; no shares and 20,348,788 shares authorized at December 31, 2020 and December 31, 2019, respectively; no shares and 19,278,606 issued and outstanding at December 31, 2020 and December 31, 2019, respectively; aggregate liquidation preference of $0 and $178,058 at December 31, 2020 and December 31, 2019, respectively Temporary Equity Carrying Amount Attributable To Parent Stockholders' equity (deficit): Stockholders Equity [Abstract] Preferred stock, $0.0001 par value; 200,000,000 shares and no shares authorized at December 31, 2020 and December 31, 2019, respectively; no shares issued and outstanding at December 31, 2020 and December 31, 2019, respectively Preferred Stock Value Common stock, $0.0001 par value; 1,000,000,000 shares and 26,750,000 shares authorized at December 31, 2020 and December 31, 2019, respectively; 36,672,415 shares and 1,984,222 shares issued and outstanding at December 31, 2020 and December 31, 2019, respectively Common Stock Value Additional paid-in capital Additional Paid In Capital Common Stock Accumulated deficit Retained Earnings Accumulated Deficit Accumulated other comprehensive loss Accumulated Other Comprehensive Income Loss Net Of Tax Total stockholders' equity (deficit) Stockholders Equity Total liabilities, convertible preferred stock and stockholders' equity (deficit) Liabilities And Stockholders Equity Convertible preferred stock, par value Temporary Equity Par Or Stated Value Per Share Convertible preferred stock, authorized Temporary Equity Shares Authorized Convertible preferred stock, issued Temporary Equity Shares Issued Convertible preferred stock, outstanding Temporary Equity Shares Outstanding Aggregate liquidation preference Temporary Equity Liquidation Preference Preferred stock, par value Preferred Stock Par Or Stated Value Per Share Preferred stock, shares authorized Preferred Stock Shares Authorized Preferred stock, shares, issued Preferred Stock Shares Issued Preferred stock, shares, outstanding Preferred Stock 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 Excluding Acquired In Process Cost Acquired in-process research and development Research And Development In Process General and administrative General And Administrative Expense Total operating expenses Operating Expenses Loss from operations Operating Income Loss Other income: Other Nonoperating Income Expense [Abstract] Interest income, net Interest Income Expense Nonoperating Net Other income Other Nonoperating Income Total other income Nonoperating Income Expense Net loss Net Income Loss Other comprehensive loss: Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Unrealized loss on available-for-sale securities Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period 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 outstanding, basic and diluted Weighted Average Number Of Share Outstanding Basic And Diluted Temporary equity stock issued during period shares net of issuance costs. Temporary equity conversion to common stock shares. Temporary equity conversion to common stock value. Statement Of Stockholders Equity [Abstract] Statement [Table] Statement [Table] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid In Capital [Member] Accumulated Deficit Retained Earnings [Member] Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income [Member] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Convertible Preferred Stock Convertible Preferred Stock [Member] Sale of Stock Subsidiary Sale Of Stock [Axis] Sale of Stock Sale Of Stock Name Of Transaction [Domain] Initial Public Offering I P O [Member] Public offering. Public Offering Public Offering [Member] Statement [Line Items] Statement [Line Items] Beginning Balance Beginning Balance (in shares) Beginning Balance Beginning Balance (in shares) Issuance of Series C and D preferred stock, net of issuance costs Temporary Equity Stock Issued During Period Value New Issues Issuance of Series C and D preferred stock, net of issuance costs (in shares) Temporary Equity Stock Issued During Period Shares Net Of Issuance Costs Offering of common stock Stock Issued During Period Value New Issues Offering of common stock (in shares) Stock Issued During Period Shares New Issues Issuance costs associated with offering of common stock Adjustments To Additional Paid In Capital Stock Issued Issuance Costs Conversion to Common Stock Temporary Equity Conversion To Common Stock Value Conversion to Common Stock (in shares) Temporary Equity Conversion To Common Stock Shares Conversion to Common Stock Stock Issued During Period Value Conversion Of Convertible Securities Conversion to Common Stock (in shares) Stock Issued During Period Shares Conversion Of Convertible Securities Issuance of common stock related to acquired-in- process research and development Stock Issued During Period Value Acquisitions Issuance of common stock related to acquired-in-process research and development (in shares) Stock Issued During Period Shares Acquisitions Exercise of common stock options Stock Issued During Period Value Stock Options Exercised Exercise of common stock options (in shares) Stock Issued During Period Shares Stock Options Exercised Stock-based compensation expense Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Net loss Profit Loss Other comprehensive loss Other Comprehensive Income Loss Net Of Tax Ending Balance Ending Balance (in shares) Ending Balance Ending Balance (in shares) Temporary equity stock issuance costs. Series C Convertible Preferred Stock Series C Preferred Stock [Member] Series C and D preferred stock. Series C and D Convertible Preferred Stock Series C And D Preferred Stock [Member] Preferred stock, issuance costs Temporary Equity Stock Issuance Costs Non-cash stock consideration, acquisition. Payments of stock issuance costs with initial public offering. Payments of stock issuance costs with public offering. Unpaid deferred financing costs. Statement Of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided By Used In Operating Activities [Abstract] Net 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 Stock-based compensation expense Share Based Compensation Non-cash stock consideration, acquisition Non Cash Stock Consideration Acquisition Loss on fixed asset disposals Gain Loss On Disposition Of Assets1 Amortization of discount on investments, net Accretion Amortization Of Discounts And Premiums Investments Changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Prepaid expenses and other current assets Increase Decrease In Prepaid Deferred Expense And Other Assets Accounts payable and accrued other liabilities Increase Decrease In Accounts Payable And 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] Acquisitions of property and equipment Payments To Acquire Property Plant And Equipment Purchases of investments Payments To Acquire Investments Sales and maturities of investments Proceeds From Sale And Maturity Of Marketable Securities Proceeds from notes receivable Proceeds From Sale Of Notes Receivable 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 pursuant to initial public offering Proceeds From Issuance Initial Public Offering Issuance costs associated with initial public offering Payments Of Stock Issuance Costs With Initial Public Offering Proceeds from issuance of common stock pursuant to public offering Proceeds From Issuance Of Common Stock Issuance costs associated with public offering Payments Of Stock Issuance Costs With Public Offering Proceeds from issuance of preferred stock, net of issuance costs Proceeds From Issuance Of Preferred Stock And Preference Stock Proceeds from stock option exercises Proceeds From Stock Options Exercised Net cash provided by financing activities Net Cash Provided By Used In Financing Activities Net (decrease) increase in cash and cash equivalents Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect Cash and cash equivalents, beginning of period Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Cash and cash equivalents, end of period Supplemental disclosure of non-cash investing and financing activities: Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract] Conversion of preferred stock to common stock Conversion Of Stock Amount Converted1 Amounts accrued for purchase of property and equipment Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 Unpaid deferred financing costs Unpaid Deferred Financing Costs Documents Incorporated by Reference Documents Incorporated By Reference [Text Block] Organization Consolidation And Presentation Of Financial Statements [Abstract] Description of the Business Nature Of Operations Accounting Policies [Abstract] Basis of Presentation and Summary of Significant Accounting Policies Basis Of Presentation And Significant Accounting Policies [Text Block] License agreements disclosure. License agreements. License Agreements [Abstract] License Agreements License Agreements Disclosure [Text Block] Property Plant And Equipment [Abstract] Property and Equipment, Net Property Plant And Equipment Disclosure [Text Block] Accrued Liabilities Current [Abstract] Accrued Liabilities Accounts Payable Accrued Liabilities And Other Liabilities Disclosure Current [Text Block] Investments Debt And Equity Securities [Abstract] Short-Term Investments Investments In Debt And Marketable Equity Securities And Certain Trading Assets Disclosure [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements Fair Value Disclosures [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] Equity Incentive Plans and Stock-Based Compensation Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Income Tax Disclosure [Abstract] Income Tax Income Tax Disclosure [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Compensation And Retirement Disclosure [Abstract] Employee Benefit Plan Pension And Other Postretirement Benefits Disclosure [Text Block] Basis of Presentation Basis Of Accounting Policy Policy [Text Block] Use of Estimates Use Of Estimates Concentration of Credit Risk Concentration Risk Credit Risk Fair Value of Financial Instruments Fair Value Of Financial Instruments Policy Cash and Cash Equivalents Cash And Cash Equivalents Policy [Text Block] Investments Investment Policy [Text Block] Property and Equipment Property Plant And Equipment Policy [Text Block] Impairment of Property and Equipment Impairment Or Disposal Of Long Lived Assets Policy [Text Block] Deferred rent policy. Deferred Rent Deferred Rent Policy Policy [Text Block] Research and Development Expenses and Accrued Research and Development Expenses Research And Development Expense Policy Income Taxes Income Tax Policy [Text Block] Stock-Based Compensation Share Based Compensation Option And Incentive Plans Policy License fees. License Fees License Fees Policy [Text Block] Deferred Offering Costs Deferred Charges Policy [Text Block] Comprehensive Loss Comprehensive Income Policy Policy [Text Block] Net Loss Per Share Earnings Per Share Policy [Text Block] Recently Adopted Accounting Pronouncements New Accounting Pronouncements Policy Policy [Text Block] New Accounting Pronouncements Not Yet Adopted [Policy Text Block] New Accounting Pronouncements Not Yet Adopted New Accounting Pronouncements Not Yet Adopted Policy [Text Block] Summary of Computation of Basic and Diluted Net Loss Per Share Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Summary of Outstanding Shares of Potentially Dilutive Securities Excluded from Computation of Diluted Net Loss Per Share Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Text Block] Schedule of Property and Equipment, Net Property Plant And Equipment [Text Block] Schedule of Accrued Liabilities Schedule Of Accrued Liabilities Table [Text Block] Schedule of Cost, Gross Unrealized Holding Gains, Gross Unrealized Holding Losses and Fair Value of Available for Sale Investments Debt Securities Available For Sale Table [Text Block] Schedule of Assets Measured at Fair Value on Recurring Basis Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis Table [Text Block] Schedule of Convertible Preferred Stock Authorized and Issued and its Principal Terms Temporary Equity Table [Text Block] Summary of Option Activity Schedule Of Share Based Compensation Stock Options Activity Table [Text Block] Summary of Fair Value of Stock Options Estimated Using Black-Scholes Merton Option Pricing Model Assumptions Schedule Of Share Based Payment Award Stock Options Valuation Assumptions Table [Text Block] Summary of Total Stock-based Compensation Expense Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Text Block] Schedule of Provision for Income Taxes and Income Taxes Computed Schedule Of Components Of Income Tax Expense Benefit Table [Text Block] Significant Components of Deferred Tax Assets and Liabilities Schedule Of Deferred Tax Assets And Liabilities Table [Text Block] Summary of Future Minimum Lease Payments under Non-cancelable Operating Leases Schedule Of Future Minimum Rental Payments For Operating Leases Table [Text Block] Description of the Business. Description of the business. Description Of Business [Table] Description Of Business [Table] Option to Purchase Additional Shares Over Allotment Option [Member] Statistical Measurement Range [Axis] Statistical Measurement Range [Member] Maximum Maximum [Member] Minimum Minimum [Member] Secondary public offering. Secondary Public Offering Secondary Public Offering [Member] Description Of Business [Line Items] Description Of Business [Line Items] Number of operating segments Number Of Operating Segments Accumulated deficit Underwriting discounts, commissions and other offering expenses. Proceeds from issuance initial public offering, net of issuance cost. Shares of common stock issued Price per share of common stock Share Price Underwriting discounts and commissions and other offering expenses Underwriting Discounts Commissions And Other Offering Expenses Net proceeds from IPO Proceeds From Issuance Initial Public Offering Net Of Issuance Cost Convertible preferred stock outstanding converted into shares of common stock Conversion Of Stock Shares Converted1 Reverse stock split Stockholders Equity Reverse Stock Split Reverse stock split ratio Stockholders Equity Note Stock Split Conversion Ratio1 Proceeds from issuance of common stock gross. Gross proceeds from secondary public offering excluding underwriting discounts and commissions and other offering expenses Proceeds From Issuance Of Common Stock Gross Basis of presentation and summary of significant accounting policies. Basis of presentation and summary of significant accounting policies. Basis Of Presentation And Summary Of Significant Accounting Policies [Table] Basis Of Presentation And Summary Of Significant Accounting Policies [Table] Balance Sheet Location Balance Sheet Location [Axis] Balance Sheet Location Balance Sheet Location [Domain] Other Assets Other Noncurrent Assets [Member] Accounting Standards Update Adjustments For New Accounting Pronouncements [Axis] Accounting Standards Update Type Of Adoption [Member] ASU No 2019-12 Accounting Standards Update201912 [Member] Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] Deferred offering costs Deferred Costs Liquid investments maturity period. Liquid investments maturity period Liquid Investments Maturity Period Estimated useful lives of related assets Property Plant And Equipment Useful Life Property Plant and Equipment Impairment Loss Impairment of property and equipment Property Plant And Equipment Impairment Loss Options granted, maximum contractual term Deferred Compensation Arrangement With Individual Maximum Contractual Term1 Earnings Per Share [Abstract] Numerator Net Income Loss [Abstract] Denominator Weighted Average Number Of Shares Outstanding Diluted Disclosure Items [Abstract] Weighted average shares outstanding used in computing net loss per share, basic and diluted Net loss per share, basic and diluted 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] Options to purchase common stock. Options to Purchase Common Stock Options To Purchase Common Stock [Member] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Anti dilutive securities excluded from computation of net loss per share Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Change in accounting principle, accounting standards update, early adoption Change In Accounting Principle Accounting Standards Update Early Adoption Change in accounting principle, accounting standards update, early adoption Change In Accounting Principle Accounting Standards Update Immaterial Effect Number of licensed products obliged to develop and commercialize. License agreements. License agreements. License Agreements [Table] License Agreements [Table] Related Party Related Party Transactions By Related Party [Axis] Related Party Related Party [Domain] Mirati Therapeutics, Inc. Mirati Therapeutics, Inc Mirati Therapeutics Inc [Member] Private Placement Private Placement [Member] Voronoi Inc. Voronoi Inc. Voronoi Inc [Member] Contingent Consideration by Type Contingent Consideration By Type [Axis] Contingent Consideration Type Contingent Consideration Type [Domain] Development and regulatory milestone. Development And Regulatory Milestone Development And Regulatory Milestone [Member] Commercial milestone. Commercial Milestone Commercial Milestone [Member] Success based milestones. Success Based Milestones Success Based Milestones [Member] Income Statement Location Income Statement Location [Axis] Income Statement Location Income Statement Location [Domain] Acquired in-process research and development expense. Acquired In-Process Research and Development Expense [Member] Acquired In Process Research And Development Expense [Member] License Agreements [Line Items] License Agreements [Line Items] Number of licensed products obliged to develop and commercialize Number Of Licensed Products Obliged To Develop And Commercialize Number of period the agreement in effect. Number of period the agreement in effect Number Of Period Agreement In Effect Shares issued percentage of premium. Stock transfer restrictions period. Upfront payment shares issued Upfront payment value Issue price per share Shares Issued Price Per Share Premium percentage Shares Issued Percentage Of Premium Stock transfer restrictions period Stock Transfer Restrictions Period Upfront cash payment. Upfront cash payment Upfront Cash Payment License agreement maximum milestone payment obligation to pay. License agreement additional Milestone payment. License agreement maximum milestone payment obligation to pay License Agreement Maximum Milestone Payment Obligation To Pay License agreement, additional milestone payment License Agreement Additional Milestone Payment License agreement charge related to acquired assets. License agreement cash payment related to acquired assets charge. License agreement shares issued value related to acquired assets charge. License agreement charge related to acquired assets License Agreement Charge Related To Acquired Assets License agreement cash payment related to acquired assets charge License Agreement Cash Payment Related To Acquired Assets Charge License agreement shares issued value related to acquired assets charge License Agreement Shares Issued Value Related To Acquired Assets Charge 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] Lab equipment. Lab Equipment Lab Equipment [Member] Leasehold Improvements Leasehold Improvements [Member] Computer hardware and software. Computer Hardware and Software Computer Hardware And Software [Member] Furniture and Fixtures Furniture And Fixtures [Member] Property, Plant and Equipment [Line Items] Property Plant And Equipment [Line Items] Total property and equipment, gross Property Plant And Equipment Gross Less accumulated depreciation Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Total property and equipment, net Depreciation expense Accrued clinical and manufacturing costs. Accrued deferred financing costs current. Accrued compensation Accrued Salaries Current Accrued clinical and manufacturing costs Accrued Clinical And Manufacturing Costs Other accruals Other Accrued Liabilities Current Deferred rent - short-term Accrued Rent Current Accrued deferred financing costs Accrued Deferred Financing Costs Current Total accrued liabilities Available for sale, Investment Available For Sale Securities Debt Securities Debt Securities Available For Sale [Table] Debt Securities Available For Sale [Table] Financial Instrument Financial Instrument [Axis] Financial Instruments Transfers And Servicing Of Financial Instruments Types Of Financial Instruments [Domain] U.S. Treasury Securities U S Treasury Securities [Member] Schedule Of Available For Sale Securities [Line Items] Schedule Of Available For Sale Securities [Line Items] Amortized Cost Available For Sale Debt Securities Amortized Cost Basis Unrealized Gains Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax Unrealized Losses Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax Estimated Fair Value Number of securities in unrealized loss position Debt Securities Available For Sale Unrealized Loss Position Number Of Positions Fair Value By Balance Sheet Grouping [Table] Fair Value By Balance Sheet Grouping [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] Measurement Basis Fair Value By Measurement Basis [Axis] Fair Value Disclosure Item Amounts [Default] Portion At Fair Value Fair Value Disclosure [Member] Fair Value Measurement Fair Value Disclosure Item Amounts [Domain] Fair Value Estimate Of Fair Value Fair Value Disclosure [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] Level 3 Fair Value Inputs Level3 [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 Balance Sheet Grouping Financial Statement Captions [Line Items] Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] Assets, Fair Value Assets Fair Value Disclosure Fair Value, assets, level 2 to level 3 transfers, amount. Fair value, assets, level 3 to level 2 transfers, amount. Fair value, assets, level 1 to level 3 transfers, amount. Fair value, assets, level 3 to level 1 transfers, amount Transfer between level 1 to 2 Fair Value Assets Level1 To Level2 Transfers Amount Transfer between level 2 to 1 Fair Value Assets Level2 To Level1 Transfers Amount Transfer between level 2 to 3 Fair Value Assets Level2 To Level3 Transfers Amount Transfer between level 3 to 2 Fair Value Assets Level3 To Level2 Transfers Amount Transfer between level 1 to 3 Fair Value Assets Level1 To Level3 Transfers Amount Transfer between level 3 to 1 Fair Value Assets Level3 To Level1 Transfers Amount Temporary equity issued period. Temporary Equity By Class Of Stock [Table] Temporary Equity By Class Of Stock [Table] Series A Convertible Preferred Stock Series A Preferred Stock [Member] Series B Convertible Preferred Stock Series B Preferred Stock [Member] Series D Convertible Preferred Stock Series D Preferred Stock [Member] Temporary Equity [Line Items] Temporary Equity [Line Items] Shares Authorized Shares Issued Shares Outstanding Issue Period Temporary Equity Issued Period Issue Price per Share Dividend Annual Rate per Share Preferred Stock Dividend Rate Per Dollar Amount Aggregate Liquidation Preference Outstanding shares of convertible preferred stock converted into shares of common stock Convertible Preferred Stock Shares Issued Upon Conversion Maximum number of additional 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 twenty equity incentive plan. 2020 Plan Two Thousand Twenty Equity Incentive Plan [Member] Two thousand fourteen equity incentive plan. 2014 Plan Two Thousand Fourteen Equity Incentive Plan [Member] Two thousand twenty equity incentive plan and two thousand fourteen equity incentive plan. 2020 Plan and 2014 Plan Two Thousand Twenty Equity Incentive Plan And Two Thousand Fourteen Equity Incentive Plan [Member] Award Type Award Type [Axis] Award Type Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Stock Options Employee Stock Option [Member] Incentive stock options. Incentive Stock Options Incentive Stock Options [Member] Two thousand and twenty employee stock purchase plan. 2020 ESPP Two Thousand And Twenty Employee Stock Purchase Plan [Member] Employee Stock Purchase Plan Employee Stock [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 stock initially reserved for issuance Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized Number of common stock remained available for issuance Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant Additional number of shares available for future issuance Maximum Number Of Additional Common Stock Capital Shares Reserved For Future Issuance Percentage of outstanding shares of common stock Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Outstanding Stock Maximum Share based compensation arrangement by share based payment award minimum percentage of combined voting rights of common stock holders. Share based compensation arrangement by share based payment award stock options not be granted at less than fair market value of common stock at date of grant percentage. Share based compensation arrangement by share based payment award options not be granted at less than fair market value of common stock at date of grant maximum term. Expiration period Sharebased Compensation Arrangement By Sharebased Payment Award Expiration Period Vesting period Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 Exercise price as a percentage of fair market value Sharebased Compensation Arrangement By Sharebased Payment Award Purchase Price Of Common Stock Percent Minimum percentage required for holders of combined voting power to be eligible for incentive stock options Share Based Compensation Arrangement By Share Based Payment Award Minimum Percentage Of Combined Voting Rights Of Common Stock Holders Percentage of options may not be granted at less than fair market value of the common stock at the date of grant Share Based Compensation Arrangement By Share Based Payment Award Options Not Be Granted At Less Than Fair Market Value Of Common Stock At Date Of Grant Percentage Maximum term of options may not be granted at less than fair market value of the common stock at the date of grant Share Based Compensation Arrangement By Share Based Payment Award Options Not Be Granted At Less Than Fair Market Value Of Common Stock At Date Of Grant Maximum Term Number of shares available for future issuance Common Stock Capital Shares Reserved For Future Issuance Options outstanding, Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number Options, Granted Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross Options, Exercised Options, Forfeited and cancelled Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Options outstanding, Ending Balance Options, Exercisable Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number Weighted Average Exercise Price, Options 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, Forfeited and Cancelled Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price Weighted Average Exercise Price, Options outstanding Ending Balance Weighted Average Exercise Price, Exercisable Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years), Options outstanding Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 Weighted Average Remaining Contractual Term (in years), Exercisable Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 Aggregate Intrinsic Value, Options outstanding Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value Aggregate Intrinsic Value, Exercisable Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 Intrinsic value of options exercised Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value Share-based compensation arrangement by share-based payment award number of shares subject to repurchase. Share based compensation arrangement by share based payment award shares issued subject to repurchase liabilities recorded. Shares subject to repurchase Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Subject To Repurchase Liabilities with shares issued with repurchase rights Share Based Compensation Arrangement By Share Based Payment Award Shares Issued Subject To Repurchase Liabilities Recorded Number of shares issued under ESPP Stock Issued During Period Shares Employee Stock Purchase Plans Expected dividend yield Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate Stock price 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 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 Expected term (in years) Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 Weighted-average grant-date fair value of options granted Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value Stock-based compensation expense Allocated Share Based Compensation Expense Total unrecognized compensation expense related to outstanding unvested stock-based awards Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Total unrecognized compensation expense related to outstanding unvested stock-based awards expected to be recognized over weighted-average remaining service period Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 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 Research And Development Expense [Member] 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] Statutory rate Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate State tax Income Tax Reconciliation State And Local Income Taxes Other permanent items Income Tax Reconciliation Other Reconciling Items Research and development credit Income Tax Reconciliation Tax Credits Research Change in valuation allowance Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance Impact of Tax Cuts and Jobs Act Tax Cuts And Jobs Act Of2017 Measurement Period Adjustment Income Tax Expense Benefit Stock-based compensation Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost Provisions for income taxes Income Tax Expense Benefit Deferred Tax Assets, Research and Development Deferred Tax Liabilities Fixed Assets Deferred tax assets: Deferred Tax Assets Net [Abstract] Net operating loss carryforward Deferred Tax Assets Operating Loss Carryforwards Research and development credits Deferred Tax Assets Research And Development Deferred rent Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Deferred Rent Accruals and other Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other Intangible Deferred Tax Assets Goodwill And Intangible Assets Gross deferred tax assets Deferred Tax Assets Gross Less valuation allowance Deferred Tax Assets Valuation Allowance Total deferred tax assets Deferred Tax Assets Net Deferred tax liabilities: Deferred Tax Liabilities Net [Abstract] Fixed assets Deferred Tax Liabilities Fixed Assets Net deferred tax assets Deferred Tax Assets Liabilities Net Income tax. Income tax. Income Tax [Table] Income Tax [Table] Geographical Statement Geographical [Axis] Geographical Segment Geographical [Domain] CALIFORNIA CALIFORNIA Scenario Statement Scenario [Axis] Scenario Scenario Unspecified [Domain] Scenario One Begin to expire in 2034 Scenario One [Member] Scenario Two Not expire Scenario Two [Member] Income Tax [Line Items] Income Tax [Line Items] Valuation allowance Increase in valuation allowance Valuation Allowance Deferred Tax Asset Change In Amount Net operating loss carryforwards Operating Loss Carryforwards Operating loss carryforwards, expiration Operating Loss Carryforwards Expiration Date Cumulative change in ownership period. Cumulative change in ownership percentage Threshold Percentage Of Value Decline In Equity Securities To Be Considered Other Than Temporary Impairment Cumulative change in ownership period Cumulative Change In Ownership Period Unrecognized tax benefits Unrecognized Tax Benefits Accrual for interest or penalties Income Tax Examination Penalties And Interest Accrued Interest and penalties not recognized Unrecognized Tax Benefits Income Tax Penalties And Interest Expense Loss Contingencies [Table] Loss Contingencies [Table] South San Francisco, California. South San Francisco, California South San Francisco California [Member] San Diego California San Diego, California San Diego California [Member] South San Francisco and San Diego locations. South San Francisco and San Diego Locations South San Francisco And San Diego Locations [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Operating lease expiration date Lease Expiration Date1 Operating lease, term of contract Lessee Operating Lease Term Of Contract Operating lease, renewal term Lessee Operating Lease Renewal Term Extend the lease term Lessee Operating Lease Option To Extend Total rent expense Operating Leases Rent Expense Net 2021 Operating Leases Future Minimum Payments Due Current 2022 Operating Leases Future Minimum Payments Due In Two Years 2023 Operating Leases Future Minimum Payments Due In Three Years 2024 Operating Leases Future Minimum Payments Due In Four Years Total minimum lease payments Operating Leases Future Minimum Payments Due Employer contribution amount Defined Contribution Plan Employer Discretionary Contribution Amount