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License Agreements - Merus (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 91 Months Ended
Dec. 31, 2016
item
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]
Realized and unrealized gain on equity investments   $ 39,241 $ 41,811 $ 139,188 $ 36,493    
Merus              
License Agreements              
Shares divested (in shares) | shares   3,000,000.0          
Proceeds from sale of equity securities, FV-NI   $ 160,600          
Common stock held from investment (in shares) | shares   1,000,000.0   1,000,000.0   1,000,000.0  
Long term equity investments   $ 59,600   $ 59,600   $ 59,600 $ 110,100
Realized and unrealized gain on equity investments   $ 40,000   $ 110,200      
Unrealized gain (loss) on long term investments     $ 28,200   $ 38,600    
Merus              
License Agreements              
Number of independent programs | item 10            
Milestone payment made under license agreement           $ 10,000  
[1] The condensed consolidated balance sheet at December 31, 2023 has been derived from the audited consolidated financial statements at that date.