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 Current Fiscal Year End Date Current Fiscal Year End Date Entity Registrant Name Entity Registrant Name Trading Symbol Trading Symbol Entity Central Index Key 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 Security Exchange Name Security Exchange Name Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding 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 Quarterly Report Document Quarterly Report Document Transition Report Document Transition Report 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 and Stockholders' Equity 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 Other long-term liabilities Other Liabilities Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 9) Commitments And Contingencies Stockholders' equity: Stockholders Equity [Abstract] Preferred stock, $0.0001 par value; 200,000,000 shares authorized at March 31, 2021 and December 31, 2020; no shares issued and outstanding at March 31, 2021 and December 31, 2020 Preferred Stock Value Common stock, $0.0001 par value; 1,000,000,000 shares authorized at March 31, 2021 and December 31, 2020; 36,690,826 shares and 36,672,415 shares issued and outstanding at March 31, 2021 and December 31, 2020, respectively Common Stock Value Additional paid-in capital Additional Paid In Capital Common Stock Accumulated deficit Retained Earnings Accumulated Deficit Accumulated other comprehensive gain (loss) Accumulated Other Comprehensive Income Loss Net Of Tax Total stockholders' equity Stockholders Equity Total liabilities and stockholders' equity Liabilities And Stockholders Equity 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 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 gain 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 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] Statement [Line Items] Statement [Line Items] Beginning Balance Temporary Equity Carrying Amount Attributable To Parent Beginning Balance (in shares) Temporary Equity Shares Outstanding Beginning Balance Beginning Balance (in shares) 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 Ending Balance Ending Balance (in shares) Ending Balance Ending Balance (in shares) Unpaid deferred offering 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 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 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 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] Payment of deferred offering costs Payments Of Financing Costs Proceeds from stock option exercises Proceeds From Stock Options Exercised Net cash provided by (used in) financing activities Net Cash Provided By Used In Financing Activities Net increase (decrease) 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] Amounts accrued for purchase of property and equipment Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 Unpaid deferred offering costs Unpaid Deferred Offering Costs 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] 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] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Basis of Presentation Basis Of Accounting Policy Policy [Text Block] Recently Adopted Accounting Pronouncements New Accounting Pronouncements Policy Policy [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] Summary of Option Activity Schedule Of Share Based Compensation Stock Options Activity Table [Text Block] Summary of Outstanding Shares of Potential Dilutive Securities Excluded from Computation of Diluted Net Loss per Share Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [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] Summary of Future Lease Payments of Operating Lease Liabilities Lessee Operating Lease Liability Maturity 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] 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] 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 Stock Issued During Period Shares New Issues Price per share of common stock Share Price Proceeds from issuance of common stock pursuant to initial public offering Proceeds From Issuance Initial Public Offering 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 Proceeds from issuance of common stock pursuant to public offering Proceeds From Issuance Of Common Stock 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] Accounting Standards Update Adjustments For New Accounting Pronouncements [Axis] Accounting Standards Update Type Of Adoption [Member] ASU No. 2016-02 Accounting Standards Update201602 [Member] Cumulative Effect, Period of Adoption Cumulative Effect Period Of Adoption [Axis] Cumulative Effect, Period of Adoption Cumulative Effect Period Of Adoption [Domain] Cumulative Effect, Period of Adoption, Adjustment Cumulative Effect Period Of Adoption Adjustment [Member] ASU No. 2016-13 Accounting Standards Update201613 [Member] Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] Right-of-use assets Operating Lease Right Of Use Asset Lease liabilities Operating Lease Liability 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, adopted Change In Accounting Principle Accounting Standards Update Adopted Change in accounting principle, accounting standards update, adoption date Change In Accounting Principle Accounting Standards Update Adoption Date Change in accounting principle, accounting standards update, immaterial effect Change In Accounting Principle Accounting Standards Update Immaterial Effect Adjustment to opening balance of accumulated deficit 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] 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 Acquired In Process Research And Development Expense [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] 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 License agreement shares issued value 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 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 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 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 Accrued clinical and manufacturing costs. Accrued clinical and manufacturing costs Accrued Clinical And Manufacturing Costs Lease liabilities - short-term Operating Lease Liability Current Accrued compensation Accrued Salaries Current Other accruals Other Accrued Liabilities Current Deferred rent - short-term Accrued Rent Current Total accrued liabilities 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 Available For Sale Securities Debt Securities 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 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 Equity Incentive Plan Two Thousand Twenty Equity Incentive Plan [Member] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Number of 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 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 Stock price 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, 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 Expected dividend yield Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate 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] Stock-based compensation expense Allocated Share Based Compensation Expense Loss Contingencies [Table] Loss Contingencies [Table] Geographical Statement Geographical [Axis] Geographical Segment Geographical [Domain] South San Francisco, California. South San Francisco, California South San Francisco California [Member] San Diego California San Diego, California San Diego California [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Operating lease expiration date Lease Expiration Date1 Operating lease, renewal term Lessee Operating Lease Renewal Term Operating lease, term of contract Lessee Operating Lease Term Of Contract Extend the lease term Lessee Operating Lease Option To Extend Lease liabilities included in other current liabilities Lease liabilities included in long-term operating lease liabilities Operating Lease Liability Noncurrent Operating lease costs Operating Lease Cost Cash paid for operating lease Operating Lease Payments Weighted average discount rate Operating Lease Weighted Average Discount Rate Percent Weighted-average remaining lease term Operating Lease Weighted Average Remaining Lease Term1 2021 remaining 9 months Lessee Operating Lease Liability Payments Remainder Of Fiscal Year 2022 Lessee Operating Lease Liability Payments Due Next Twelve Months Total minimum lease payments Lessee Operating Lease Liability Payments Due Less: interest Lessee Operating Lease Liability Undiscounted Excess Amount Present value of lease liabilities 2021 Operating Leases Future Minimum Payments Due Current 2022 Operating Leases Future Minimum Payments Due In Two Years Total minimum lease payments Operating Leases Future Minimum Payments Due