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Royalty and Commercial Payment Purchase Agreements - Agenus (Details) $ in Thousands |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 20, 2018 USD ($) item | Nov. 30, 2020 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($)
Agreements |  |  |  |  |
Payments of consideration under RPAs, AAAs and CPPAs |  |  | $ 14,650 | $ 8,000 |
Long-term royalty and commercial payment receivables |  |  | 74,696 |  | $ 63,683
Royalty Purchase Agreement | Merck Immuno-Oncology Product | Agenus |  |  |  |  |
Agreements |  |  |  |  |
Amount of milestone earned under agreement |  | $ 10,000 |  |  |
Agenus | Royalty Purchase Agreement |  |  |  |  |
Agreements |  |  |  |  |
Payments of consideration under RPAs, AAAs and CPPAs | $ 15,000 |  |  |  |
Long-term royalty and commercial payment receivables | $ 15,000 |  |  |  |
Amount of allowance for credit losses |  |  | $ 0 |  | $ 0
Agenus | Royalty Purchase Agreement | Incyte Immuno-Oncology Assets |  |  |  |  |
Agreements |  |  |  |  |
Royalties entity has right to receive (as a percent) | 33.00% |  |  |  |
Number of licensed products related to milestone and royalties | item | 6 |  |  |  |
Purchased percentage of milestones | 10.00% |  |  |  |
Agenus | Royalty Purchase Agreement | Merck Immuno-Oncology Product |  |  |  |  |
Agreements |  |  |  |  |
Royalties entity has right to receive (as a percent) | 33.00% |  |  |  |
Purchased percentage of milestones | 10.00% |  |  |  |
Purchased eligible milestone payments receivable upon achievement of potential development, regulatory and commercial milestones | $ 59,500 |  |  |  |
Amount of milestone earned under agreement |  | 1,000 |  |  |
Reduction in long-term royalty receivable balance due to receipt of payment |  | $ 1,000 |  |  |

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