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License Agreements - Agenus (Details) - USD ($) $ in Thousands | 3 Months Ended | 111 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Dec. 31, 2023
License Agreements |  |  |  |  |
Fair market long term investments | $ 287,663 |  | $ 287,663 | $ 187,716 | [1]
Unrealized gain (loss) on long term investments | $ 99,947 | $ (5,318) |  |  |
Agenus |  |  |  |  |
License Agreements |  |  |  |  |
Common stock held from investment (in shares) | 12,100,000 |  | 12,100,000 |  |
Fair market long term investments | $ 7,000 |  | $ 7,000 | $ 10,000 |
Unrealized gain (loss) on long term investments | (3,000) | $ (10,600) |  |  |
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 |  |
[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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