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License Agreements - Agenus (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 105 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | May 31, 2023 | Dec. 31, 2022
License Agreements |  |  |  |  |  |  |  |
Fair market long term investments | $ 153,663,000 |  | $ 153,663,000 |  | $ 153,663,000 |  | $ 133,676,000 | [1]
Unrealized gain (loss) on long term investments | $ (26,654,000) | $ (660,000) | $ 9,839,000 | $ (72,142,000) |  |  |  |
Agenus |  |  |  |  |  |  |  |
License Agreements |  |  |  |  |  |  |  |
Common stock held from investment (in shares) | 12,100,000 |  | 12,100,000 |  | 12,100,000 |  |  |
Fair market long term investments | $ 13,600,000 |  | $ 13,600,000 |  | $ 13,600,000 |  | $ 29,000,000 |
Unrealized gain (loss) on long term investments | (5,600,000) | $ 1,300,000 | (15,300,000) | $ (14,100,000) |  |  |  |
MiNK |  |  |  |  |  |  |  |
License Agreements |  |  |  |  |  |  |  |
Fair market long term investments | 200,000 |  | 200,000 |  | 200,000 |  |  |
Unrealized gain (loss) on long term investments | (200,000) |  | 0 |  |  |  |  |
Shares acquired due to distribution of dividend (in shares) |  |  |  |  |  | 200,000 |  |
Development, Regulatory and Commercialization Milestones | Agenus |  |  |  |  |  |  |  |
License Agreements |  |  |  |  |  |  |  |
Milestone payment made under license agreement |  |  |  |  | 30,000,000 |  |  |
Additional milestone payments under the license agreement | $ 500,000,000 |  | $ 500,000,000 |  | $ 500,000,000 |  |  |
[1] | The condensed consolidated balance sheet at December 31, 2022 has been derived from the audited consolidated financial statements at that date.

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