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License Agreements - Agenus (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 93 Months Ended
Feb. 28, 2017
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2017
Sep. 30, 2022
License Agreements                  
Fair market long term investments   $ 149,124   $ 149,124   $ 221,266     $ 149,124
Unrealized gain (loss) on long term investments   (660) $ (27,450) (72,142) $ (28,394)        
Agenus                  
License Agreements                  
Shares divested (in shares)           2.0 3.7    
Gross proceeds from sale of stock           $ 10,500 $ 17,200    
Fair market long term investments   24,800   24,800   $ 38,900     24,800
Unrealized gain (loss) on long term investments   1,300 $ (2,800) (14,100) $ 29,100        
Royalty-bearing product GITR, OX40 and one undisclosed target | Agenus | Maximum                  
License Agreements                  
Royalty payments on future global net sales (as a percent) 15.00%                
Agenus                  
License Agreements                  
Period of notice for termination of license agreement 12 months                
Agenus | Royalty-bearing product other than GITR, OX40 and one undisclosed target | Minimum                  
License Agreements                  
Royalty payments on future global net sales (as a percent) 6.00%                
Agenus | Royalty-bearing product other than GITR, OX40 and one undisclosed target | Maximum                  
License Agreements                  
Royalty payments on future global net sales (as a percent) 12.00%                
Agenus | Development, Regulatory and Commercialization Milestones                  
License Agreements                  
Milestone payment made under license agreement                 30,000
Additional milestone payments under the license agreement   $ 500,000   $ 500,000         $ 500,000
Stock purchase agreement | Agenus                  
License Agreements                  
Purchase of common stock under Stock Purchase Agreement (in shares )               10.0  
Purchase price of common stock               $ 60,000  
Per share price (In USD per share)               $ 6.00