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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Related Party Transaction [Line Items]          
Accounts receivable from related parties $ 29,030   $ 29,030   $ 12,553
Investment income 898 $ 677 2,664 $ 2,023  
Equity method investments 5,806   5,806   5,290
Astellas [Member]          
Related Party Transaction [Line Items]          
Reduction of drug product revenue from related party (300) 1,300 (700) 17,700  
Due to related parties 13,200   13,200   40,500
Astellas [Member] | Collaborative Arrangement [Member]          
Related Party Transaction [Line Items]          
Accounts receivable from related parties 200   200   800
Deferred Revenue 8,100   8,100   16,900
Falikang [Member]          
Related Party Transaction [Line Items]          
Accounts receivable from related parties 15,300   15,300   5,200
Investment income 900 700 2,700 2,000  
Dividend received 2,200        
Equity method investments 5,800   $ 5,800   $ 5,300
Percentage of outstanding shares owned     51.10%    
Falikang [Member] | Collaborative Arrangement [Member]          
Related Party Transaction [Line Items]          
Revenues 42,200 26,500 $ 115,300 68,300  
License and Development [Member] | Astellas [Member] | Collaborative Arrangement [Member]          
Related Party Transaction [Line Items]          
Revenues $ 400 $ 2,400 $ 1,000 $ 5,800