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License Agreements - Merus (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 82 Months Ended
Aug. 31, 2023
USD ($)
shares
Jan. 31, 2023
USD ($)
Dec. 31, 2016
item
Sep. 30, 2023
USD ($)
shares
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
shares
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
License Agreements                  
Unrealized (loss) gain on long term investments       $ (26,654) $ (660) $ 9,839 $ (72,142)    
Merus                  
License Agreements                  
Purchase of common stock under Stock Purchase Agreement (in shares ) | shares 500,000                
Purchase price of common stock $ 10,000                
Common stock held from investment (in shares) | shares       4,000,000   4,000,000   4,000,000  
Fair market value of our long term investments       $ 94,400   $ 94,400   $ 94,400 $ 54,900
Unrealized (loss) gain on long term investments       $ (9,100) $ (9,300) $ 29,500 $ (41,800)    
Merus                  
License Agreements                  
Number of independent programs | item     10            
Milestone payment made under license agreement $ 2,500 $ 2,500           $ 8,000