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v3.19.3

Related Party Transactions - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |  |  |
Accounts receivable from related party | $ 17,662,000 |  | $ 17,662,000 |  | $ 47,210,000
Accrued liabilities to related party | 954,000 |  | 954,000 |  | 444,000
Unbilled contract asset | 180,000,000 |  | 180,000,000 |  | 0
Due from Related Parties, Current | 126,012,000 |  | 126,012,000 |  | 0
Net unbilled contract asset | 126,012,000 |  | 126,012,000 |  | 0
Deferred Revenue | 53,988,000 |  | 53,988,000 |  | 0
Europe [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Unbilled contract asset | 130,000,000.0 |  | 130,000,000.0 |  |
Astellas Agreement [Member] | Europe [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Unbilled contract asset | 130,000,000.0 |  | 130,000,000.0 |  |
Deferred Revenue | 3,988,000 |  | 3,988,000 |  |
Astellas [Member] | Europe [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Unbilled contract asset | 130,000,000.0 |  | 130,000,000.0 |  |
Net unbilled contract asset | 126,000,000.0 |  | 126,000,000.0 |  |
Deferred Revenue | 4,000,000.0 |  | 4,000,000.0 |  |
Astellas [Member] | Collaborative Arrangement [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenue related to collaboration agreements | 15,500,000 | $ 5,100,000 | 155,000,000.0 | $ 30,800,000 |
Expense related to collaboration agreements | 900,000 | $ 400,000 | 2,200,000 | $ 1,100,000 |
Accounts receivable from related party | 17,700,000 |  | 17,700,000 |  | 47,200,000
Accrued liabilities to related party | 1,700,000 |  | 1,700,000 |  | 400,000
Astellas [Member] | Astellas Agreement [Member] | Milestone Payment [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Accrued liabilities to related party | $ 12,500,000 |  | $ 12,500,000 |  |
Astellas [Member] | Astellas Agreement [Member] | Active Pharmaceutical Ingredients Shipment [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Accrued liabilities to related party |  |  |  |  | $ 43,800,000

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