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v3.21.1

Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Related Party Transaction [Line Items] |  |  |  |
Accounts receivable from related party |  | $ 32,847 |  | $ 4,127
Accrued liabilities to related party |  | 121 |  | 24
Deferred revenue |  | 3,691 |  | 2,147
Unbilled contract asset |  | 7,721 |  | 2,147
Astellas [Member] | API Shipment [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Drug product revenue from a related party |  | 4,000 |  |
Unbilled contract asset |  | 4,000 |  |
Astellas [Member] | Collaborative Arrangement [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenue related to collaboration agreements |  | 3,600 | $ 4,700 |
Expense related to collaboration agreements |  | 100 | $ 100 |
Accounts receivable from related party |  | 17,500 |  | 4,100
Accrued liabilities to related party |  | 100 |  | 1,100
Deferred revenue |  | 18,600 |  | 7,500
Falikang [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Accounts receivable from related party |  | 15,400 |  |
Investment loss |  | 200 |  |
Equity method investments |  | 2,500 |  | 2,700
Percentage of outstanding shares owned | 51.10% |  |  |
Miscellaneous receivables |  | 1,000 |  | $ 900
Falikang [Member] | Collaborative Arrangement [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenue related to collaboration agreements |  | $ 10,400 |  |

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