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License Agreements - Agenus (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 117 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Dec. 31, 2023
License Agreements            
Long term equity investments $ 27,566   $ 27,566   $ 27,566 $ 187,716 [1]
Agenus            
License Agreements            
Common stock held from investment (in shares) 600,000   600,000   600,000  
Long term equity investments $ 3,300   $ 3,300   $ 3,300 $ 10,000
Unrealized loss on long term investments 6,800 $ 5,600 6,700 $ 15,300    
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.