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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.