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License Agreements - Agenus (Details)
$ / shares in Units, $ in Thousands, shares in Millions
1 Months Ended 12 Months Ended 84 Months Ended
Feb. 01, 2017
USD ($)
$ / shares
shares
Feb. 28, 2017
programTarget
checkpointModulator
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
License agreements            
Purchase price of common stock         $ 150,000  
Per share price (in dollars per share) | $ / shares         $ 41.33  
Long term investments     $ 133,676 $ 221,266   $ 221,266
Unrealized gain (loss) on long term investments     $ (87,590) $ (24,072) $ 10,426  
Agenus            
License agreements            
Shares divested (in shares) | shares     2.0 3.7    
Gross proceeds from sale of stock     $ 10,500 $ 17,200    
Long term investments     29,000 38,900   38,900
Unrealized gain (loss) on long term investments     $ (9,900) $ 4,600 $ (10,300)  
Agenus            
License agreements            
Number of checkpoint modulators | checkpointModulator   4        
Royalty payments on future global net sales     15.00%      
License agreement, termination period     12 months      
Milestone payment made under license agreement           $ 30,000
Agenus | Designated Target, Profit Share            
License agreements            
Number of program targets | programTarget   2        
Agenus | Designated Target, Tiered Royalties            
License agreements            
Number of program targets | programTarget   1        
Agenus | Designated Target, Royalties On Global Net Sales            
License agreements            
Number of program targets | programTarget   1        
Agenus | Development, Regulatory and Commercialization Milestones            
License agreements            
Additional milestone payments under the license agreement     $ 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%      
Stock purchase agreement | Agenus            
License agreements            
Purchase of common stock under Stock Purchase Agreement (in shares ) | shares 10.0          
Purchase price of common stock $ 60,000          
Per share price (in dollars per share) | $ / shares $ 6.00