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License Agreements - Agenus (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended			108 Months Ended
	Feb. 28, 2017	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2023
License agreements
Long term investments		$ 187,716	$ 133,676		$ 187,716
Unrealized gain (loss) on long term investments		$ 43,893	(87,590)	$ (24,072)
Agenus
License agreements
Investment owned (in shares)		12,100,000			12,100,000
Long term investments		$ 10,000	29,000		$ 10,000
Unrealized gain (loss) on long term investments		(18,900)	$ (9,900)	$ 4,600
Agenus
License agreements
Royalty payments on future global net sales	15.00%
License agreement, termination period	12 months
Milestone payment made under license agreement					30,000
Agenus | Development, Regulatory and Commercialization Milestones
License agreements
Additional milestone payments under the license agreement		$ 500,000			$ 500,000
Agenus | Development, Regulatory and Commercialization Milestones | Minimum
License agreements
Royalty payments on future global net sales	6.00%
Agenus | Development, Regulatory and Commercialization Milestones | Maximum
License agreements
Royalty payments on future global net sales	12.00%

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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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