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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

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