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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Related Party Transaction [Line Items]          
Accounts receivable from related parties $ 31,694   $ 31,694   $ 16,299
Investment income (loss) 677 $ 407 2,023 $ 1,293  
Equity method investments 4,534   4,534   5,061
Astellas [Member]          
Related Party Transaction [Line Items]          
Drug product revenue from a related party 1,300 4,100 17,700 4,600  
Due to related parties 29,800   29,800   63,900
Astellas [Member] | Collaborative Arrangement [Member]          
Related Party Transaction [Line Items]          
Accounts receivable from related parties 8,700   8,700   1,500
Deferred Revenue 10,200   10,200   40,300
Astellas [Member] | License and Development [Member] | Collaborative Arrangement [Member]          
Related Party Transaction [Line Items]          
Revenues 2,400 1,400 5,800 31,000  
Falikang [Member]          
Related Party Transaction [Line Items]          
Accounts receivable from related parties 14,200   14,200   10,500
Investment income (loss) 700 400 2,000 1,300  
Dividend received 2,300        
Equity method investments 4,500   $ 4,500   $ 5,100
Percentage of outstanding shares owned     51.10%    
Falikang [Member] | Collaborative Arrangement [Member]          
Related Party Transaction [Line Items]          
Revenues $ 26,500 $ 14,900 $ 68,300 $ 50,900