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License Agreements - Merus (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 88 Months Ended
Dec. 31, 2016
item
Mar. 31, 2024
USD ($)
shares
Mar. 31, 2023
USD ($)
Mar. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
License Agreements          
Long term investments   $ 287,663   $ 287,663 $ 187,716 [1]
Unrealized gain (loss) on long term investments   $ 99,947 $ (5,318)    
Merus          
License Agreements          
Common stock held from investment (in shares) | shares   4,000,000   4,000,000  
Merus          
License Agreements          
Long term investments   $ 180,300   $ 180,300 $ 110,100
Unrealized gain (loss) on long term investments   $ 70,200 $ 10,400    
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.