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License Agreements - Agenus (Details) - USD ($) $ in Millions | 3 Months Ended | 123 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2025
Agenus |  |
License Agreements |  |
Unrealized loss on long term investments | $ 3.0 |
Development, Regulatory and Commercialization Milestones | Agenus |  |
License Agreements |  |
Milestone payment made under license agreement |  | $ 30.0
Additional milestone payments under the license agreement |  | $ 500.0

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