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License Agreements - Agenus (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 114 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 30, 2024 | Jun. 30, 2024 USD ($) shares | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) shares | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) shares | Dec. 31, 2023 USD ($)
License Agreements |  |  |  |  |  |  |  |
Long term equity investments |  | $ 29,668 |  | $ 29,668 |  | $ 29,668 | $ 187,716 | [1]
Agenus |  |  |  |  |  |  |  |
License Agreements |  |  |  |  |  |  |  |
Common stock held from investment (in shares) | shares |  | 600,000 |  | 600,000 |  | 600,000 |  |
Effected stock split (as a percent) | 0.05 |  |  |  |  |  |  |
Long term equity investments |  | $ 10,100 |  | $ 10,100 |  | $ 10,100 | $ 10,000 |
Unrealized gain (loss) on long term investments |  | 3,100 | $ 900 | 100 | $ (9,700) |  |  |
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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