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Second Installment Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] 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 Leasehold improvements Leasehold Improvements [Member] Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] 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 Schedule of Royalty Transaction Activity Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Operating expenses: Operating 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Toxicology Studies [Member] In Vivo Toxicology Studies [Member] Collaboration Revenue [Member] Collaboration Revenue