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License Agreements - Agenus (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 117 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Dec. 31, 2023
License Agreements |  |  |  |  |  |  |
Long term equity investments | $ 27,566 |  | $ 27,566 |  | $ 27,566 | $ 187,716 | [1]
Agenus |  |  |  |  |  |  |
License Agreements |  |  |  |  |  |  |
Common stock held from investment (in shares) | 600,000 |  | 600,000 |  | 600,000 |  |
Long term equity investments | $ 3,300 |  | $ 3,300 |  | $ 3,300 | $ 10,000 |
Unrealized loss on long term investments | 6,800 | $ 5,600 | 6,700 | $ 15,300 |  |  |
Development, Regulatory and Commercialization Milestones | Agenus |  |  |  |  |  |  |
License Agreements |  |  |  |  |  |  |
Milestone payment made under license agreement |  |  |  |  | 30,000 |  |
Additional milestone payments under the license agreement | $ 500,000 |  | $ 500,000 |  | $ 500,000 |  |
[1] | The condensed consolidated balance sheet at December 31, 2023 has been derived from the audited consolidated financial statements at that date.

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