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v3.20.2

Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2020 | Dec. 31, 2019
Related Party Transaction [Line Items] |  |  |  |  |  |
Accounts receivable from related party | $ 12,090 |  | $ 12,090 |  |  | $ 4,845
Accrued liabilities to related party | 216 |  | 216 |  |  | 36,883
Unbilled contract asset | 0 |  | 0 |  |  | 180,000
Net unbilled contract asset | 0 |  | 0 |  |  | 125,210
Deferred revenue | 0 |  | 0 |  |  | 54,790
Europe [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Unbilled contract asset | 130,000 |  | 130,000 |  |  |
Astellas Agreement [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Drug product revenue from a related party | 8,238 | $ 0 | 8,238 | $ 0 |  |
Astellas Agreement [Member] | Japan [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Deferred revenue | 183 |  | 183 |  |  |
Astellas Agreement [Member] | Europe [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Unbilled contract asset |  |  |  |  |  | 130,000
Deferred revenue | 2,338 |  | 2,338 |  |  |
Astellas [Member] | Europe [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Unbilled contract asset | 130,000 |  | 130,000 |  |  |
Net unbilled contract asset | 0 |  | 0 |  |  | 125,200
Deferred revenue | 0 |  | 0 |  |  | 4,800
Astellas [Member] | Collaborative Arrangement [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Revenue related to collaboration agreements | 4,800 | 134,700 | 9,500 | 139,600 |  |
Drug product revenue from a related party | 8,200 |  | 8,200 |  |  |
Expense related to collaboration agreements | 200 | $ 800 | 300 | $ 1,300 |  |
Accounts receivable from related party | 12,100 |  | 12,100 |  |  | 4,800
Accrued liabilities to related party | $ 200 |  | $ 200 |  |  | $ 36,900
Astellas [Member] | Astellas Agreement [Member] | Japan [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Accrued liabilities to related party |  |  |  |  | $ 36,300 |

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