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Related Party Transactions - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Related Party Transaction [Line Items] |  |  |  |  |
Accounts receivable from related party | $ 13,352,000 |  | $ 13,352,000 |  | $ 4,127,000
Accrued liabilities to related party | 14,000 |  | 14,000 |  | 24,000
Deferred revenue | 5,256,000 |  | 5,256,000 |  | 2,147,000
Astellas [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Drug product revenue from a related party | (2,000,000.0) | $ 8,200,000 | 2,100,000 | $ 8,200,000 |
Astellas [Member] | Collaborative Arrangement [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenue related to collaboration agreements | 2,600,000 | $ 4,800,000 | 6,300,000 | $ 9,500,000 |
Accounts receivable from related party | 2,600,000 |  | 2,600,000 |  | 4,100,000
Accrued liabilities to related party |  |  |  |  | 1,100,000
Deferred revenue | 20,100,000 |  | 20,100,000 |  | 7,500,000
Falikang [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Accounts receivable from related party | 10,800,000 |  | 10,800,000 |  |
Investment income | 600,000 |  | 300,000 |  |
Equity method investments | 3,100,000 |  | $ 3,100,000 |  | 2,700,000
Percentage of outstanding shares owned |  |  | 51.10% |  |
Miscellaneous receivables | 0 |  | $ 0 |  | $ 900,000
Falikang [Member] | Collaborative Arrangement [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenue related to collaboration agreements | $ 11,800,000 |  | $ 22,200,000 |  |

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