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shares) Weighted Average Number of Shares Outstanding, Basic Filing of the first BLA - first indication Filing of Biologics License Application - First Indication [Member] Filing of Biologics License Application - First Indication Noncash advance future royalties revenue Noncash Advance Future Royalties Revenue Noncash Advance Future Royalties Revenue Stock based compensation expense Share-Based Payment Arrangement, Expense Security Exchange Name Security Exchange Name Stock options outstanding, beginning balance (in dollars per share) Stock options outstanding, ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Other Liabilities Disclosure [Abstract] Preferred stock, $0.001 par value, 10,000 shares authorized and no shares, issued or outstanding at March 31, 2023 and December 31, 2022, respectively Preferred Stock, Value, Issued Lease termination term Lessee, Operating Lease, Expiration Period Lessee, Operating Lease, Expiration Period Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] General and administrative General and Administrative Expense [Member] Collaboration revenue Revenue from Contract with Customer, Excluding Assessed Tax Net of proceeds Advance Future Royalties, Liability, Noncurrent, Net Advance Future Royalties, Liability, Noncurrent, Net Cover [Abstract] Cover [Abstract] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Long-term investments Debt Securities, Available-for-Sale, Noncurrent Royalty Agreement, Up To $1.0 billion Royalty Agreement, Up To $1. 0 billion [Member] Royalty Agreement, Up To $1. 0 billion Equity Incentive Plans Share-Based Payment Arrangement [Text Block] Schedule of Non-cash Stock-based Compensation Expense Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Receivables from collaborative partners Increase (Decrease) in Contract with Customer, Asset DRI Healthcare Trust DRI Healthcare Trust [Member] DRI Healthcare Trust Second commercial sales milestone Second Commercial Sales Milestone [Member] Second Commercial Sales Milestone Risk-free interest rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate At any time after 2027 Third Installment [Member] Third Installment Total liabilities and stockholders’ equity Liabilities and Equity Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Beginning balance Ending balance Advance Future Royalties, Liabilities Advance Future Royalties, Liabilities Remaining available for future share repurchases Stock Repurchase Program, Remaining Authorized Repurchase Amount Repayment of liability for sale of future royalties Royalty and milestone payments to Sagard Advance Future Royalty And Milestone Payments Advance Future Royalty And Milestone Payments Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Current Fiscal Year End Date Current Fiscal Year End Date Upfront license fee received Revenue Recognition, Multiple-deliverable Arrangements, Upfront Fee Received Revenue Recognition, Multiple-deliverable Arrangements, Upfront Fee Received Less imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Diluted (in dollars per share) Earnings Per Share, Diluted Sale of Stock [Domain] Sale of Stock [Domain] Effective interest rate Advance Future Royalties, Interest Rate, Effective Percentage Advance Future Royalties, Interest Rate, Effective Percentage Award vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Fourth commercial sales milestone Fourth Commercial Sales Milestone [Member] Fourth Commercial Sales Milestone Total current liabilities Liabilities, Current Issuance costs related to the sale of future royalties Issuance costs related to the sale of future royalties Advance Future Royalties, Issuance Costs Advance Future Royalties, Issuance Costs 2025 Lessee, Operating Lease, Liability, to be Paid, Year Two Schedule of Time-based Restricted Stock Units Activity Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Award expiration period Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Other income (expense), net: Nonoperating Income (Expense) [Abstract] Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Schedule of Future Minimum Annual Obligations Lessee, Operating Lease, Liability, Maturity [Table Text Block] Entity Address, Address Line Two Entity Address, Address Line Two Entity Address, Address Line One Entity Address, Address Line One During 2027 Second Installment [Member] Second Installment Product and Service [Axis] Product and Service [Axis] Amounts accrued for issuance costs related to the sale of future royalties Noncash Advance Future Royalties, Issuance Costs, Incurred but Not yet Paid Noncash Advance Future Royalties, Issuance Costs, Incurred but Not yet Paid Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Anti-TIM-3 (GSK4069889A/Cobolimab) AnaptysBio Generated Anti-TIM-3 (GSK4069889A/Cobolimab) [Member] AnaptysBio Generated Anti-TIM-3 (GSK4069889A/Cobolimab) Former CEO Former Chief Executive Officer [Member] Former Chief Executive Officer Sales and maturities of investments Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale Schedule of Accrued Expenses Schedule of Accrued Liabilities [Table Text Block] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Equity [Abstract] Equity [Abstract] Released (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Entity Tax Identification Number Entity Tax Identification Number Weighted-Average Remaining Contractual Term and Aggregate Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract] Revenue from Contract with Customer [Abstract] Stock-based compensation APIC, Share-Based Payment Arrangement, Option, Increase for Cost Recognition Amortization of issuance costs Amortization Of Advance Future Royalties Issuance Costs Amortization Of Advance Future Royalties Issuance Costs Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Third commercial sales milestone Third Commercial Sales Milestone [Member] Third Commercial Sales Milestone Entity Central Index Key Entity Central Index Key Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Measurement Frequency [Axis] Measurement Frequency [Axis] Weighted-Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Name of Property [Axis] Name of Property [Axis] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Collaborative Research and Development Agreements Collaborative Arrangement Disclosure [Text Block] Other Other Accrued Liabilities, Current City Area Code City Area Code Accrued professional fees Accrued Professional Fees, Current General and administrative General and Administrative Expense ASSETS Assets [Abstract] Milestones recognized through March 31, 2023 Cumulative Milestones Recognized [Member] Cumulative Milestones Recognized Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Sale of Stock [Axis] Sale of Stock [Axis] CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] Net Loss Per Common Share Earnings Per Share, Policy [Policy Text Block] Non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Stock-based compensation Non-cash stock-based compensation cost Share-Based Payment Arrangement, Noncash Expense Weighted average grant date fair value per share (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Research and development Research and Development Expense [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] First commercial sales milestone First Commercial Sales Milestone [Member] First Commercial Sales Milestone Initiated in vivo toxicology studies using good laboratory practices (GLPs) In Vivo Toxicology Studies [Member] In Vivo Toxicology Studies [Member] Collaboration Revenue [Member] Collaboration Revenue