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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Related Party Transaction [Line Items] |  |  |  |  |
Accounts receivable from related parties | $ 6,412 |  | $ 6,412 |  | $ 12,553
Investment income | 1,177 | $ 550 | 1,766 | $ 1,346 |
Equity method investments | 6,912 |  | 6,912 |  | 5,290
Astellas [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Reduction of drug product revenue from related party | 700 | 14,300 | (500) | 16,400 |
Due to related parties | 11,600 |  | 11,600 |  | 40,500
Astellas [Member] | Collaborative Arrangement [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Accounts receivable from related parties | 300 |  | 300 |  | 800
Deferred Revenue | 9,400 |  | 9,400 |  | 16,900
Falikang [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Accounts receivable from related parties | 3,800 |  | 3,800 |  | 5,200
Investment income | 1,200 | 600 | 1,800 | 1,300 |
Equity method investments | 6,900 |  | $ 6,900 |  | $ 5,300
Percentage of outstanding shares owned |  |  | 51.10% |  |
Falikang [Member] | Collaborative Arrangement [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenues | 46,000 | 20,500 | $ 73,100 | 41,900 |
License and Development [Member] | Astellas [Member] | Collaborative Arrangement [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenues | $ 300 | $ 1,800 | $ 600 | $ 3,500 |

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