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v3.20.2

Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Accounts receivable from related party | $ 4,715 | $ 4,715 |  |  |  | $ 4,715 |  | $ 4,845
Accrued liabilities to related party | 4,135 | 4,135 |  |  |  | 4,135 |  | 36,883
Unbilled contract asset | 0 | 0 |  |  |  | 0 |  | 180,000
Net unbilled contract asset | 0 | 0 |  |  |  | 0 |  | 125,210
Deferred revenue | 0 | 0 |  |  |  | 0 |  | 54,790
Other assets from related party | 1,483 | 1,483 |  |  |  | 1,483 |  | 0
Europe [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Unbilled contract asset |  |  | $ 130,000 |  |  |  |  |
Astellas Agreement [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Drug product revenue from a related party |  | (3,957) |  |  | $ 0 | 4,281 | $ 0 |
Astellas Agreement [Member] | Japan [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Deferred revenue | 164 | 164 |  |  |  | 164 |  |
Astellas Agreement [Member] | Europe [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Unbilled contract asset |  |  |  |  |  |  |  | 130,000
Deferred revenue | 2,096 | 2,096 |  |  |  | 2,096 |  |
Astellas [Member] | Europe [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Unbilled contract asset |  |  | 130,000 |  |  |  |  |
Net unbilled contract asset |  |  |  |  |  |  |  | 125,200
Deferred revenue |  |  |  |  |  |  |  | 4,800
Astellas [Member] | API Shipment [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Revenue related to collaboration agreements |  | (4,000) |  |  |  |  |  |
Astellas [Member] | Collaborative Arrangement [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Revenue related to collaboration agreements |  | 4,700 |  |  | 15,500 | 14,200 | 155,000 |
Drug product revenue from a related party |  |  | $ 8,200 |  |  | 4,300 |  |
Expense related to collaboration agreements |  | 200 |  |  | $ 900 | 500 | $ 2,200 |
Accounts receivable from related party | 4,700 | 4,700 |  |  |  | 4,700 |  | 4,800
Accrued liabilities to related party | 4,100 | 4,100 |  |  |  | 4,100 |  | 36,900
Amount paid to related party |  |  |  | $ 36,300 |  |  |  |
Astellas [Member] | Astellas Agreement [Member] | Japan [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Accrued liabilities to related party |  |  |  | $ 4,000 |  |  |  | $ 36,300
Falikang [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Investment | $ 1,500 | 1,500 |  |  |  | 1,500 |  |
Percentage of outstanding shares owned | 51.10% |  |  |  |  |  |  |
Other assets from related party | $ 1,500 | 1,500 |  |  |  | 1,500 |  |
Miscellaneous receivables | $ 200 | $ 200 |  |  |  | $ 200 |  |

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