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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Related Party Transaction [Line Items]      
Revenues $ 147,752 $ 140,734 $ 235,309
Accounts receivable from related parties 12,553 16,299  
Investment income (loss) 2,638 1,573 1,007
Equity method investment in unconsolidated variable interest entity 5,290 5,061  
Astellas [Member]      
Related Party Transaction [Line Items]      
Drug product revenue from a related party 18,800 11,100 3,200
Due to related parties 40,500 63,900  
Astellas [Member] | Collaborative Arrangement [Member]      
Related Party Transaction [Line Items]      
Accounts receivable from related parties 800 1,500  
Deferred revenue 16,900 40,300  
Falikang      
Related Party Transaction [Line Items]      
Accounts receivable from related parties $ 5,200 10,500  
Percentage of outstanding shares owned 51.10%    
Investment income (loss) $ 2,600 1,600 1,000
Dividend received 2,300    
Equity method investment in unconsolidated variable interest entity 5,300 5,100  
Falikang | Collaborative Arrangement [Member]      
Related Party Transaction [Line Items]      
Revenues 89,100 71,200 35,600
License and Development [Member] | Astellas [Member] | Collaborative Arrangement [Member]      
Related Party Transaction [Line Items]      
Revenues $ 6,700 $ 32,500 $ 130,400