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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.