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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Related Party Transaction [Line Items]      
Accounts receivable from related parties $ 37,083   $ 12,553
Investment income 589 $ 796  
Equity method investments 5,776   5,290
Astellas [Member]      
Related Party Transaction [Line Items]      
Drug product revenue from a related party   2,100  
Reduction of drug product revenue from related party 1,200    
Due to related parties 48,300   40,500
Astellas [Member] | Collaborative Arrangement [Member]      
Related Party Transaction [Line Items]      
Accounts receivable from related parties 300   800
Deferred Revenue 10,200   16,900
Falikang [Member]      
Related Party Transaction [Line Items]      
Accounts receivable from related parties 6,800   5,200
Investment income 600 800  
Equity method investments $ 5,800   $ 5,300
Percentage of outstanding shares owned 51.10%    
Falikang [Member] | Collaborative Arrangement [Member]      
Related Party Transaction [Line Items]      
Revenues $ 27,100 21,400  
License and Development [Member] | Astellas [Member] | Collaborative Arrangement [Member]      
Related Party Transaction [Line Items]      
Revenues $ 300 $ 1,600