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v3.19.2

Related Party Transactions - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |  |  |
Accounts receivable from related party | $ 4,311,000 |  | $ 4,311,000 |  | $ 47,210,000
Accrued liabilities to related party | 781,000 |  | 781,000 |  | 444,000
Unbilled contract asset | 180,000,000 |  | 180,000,000 |  | 0
Due from Related Parties, Current | 127,981,000 |  | 127,981,000 |  | 0
Net unbilled contract asset | 127,981,000 |  | 127,981,000 |  | 0
Deferred Revenue | 52,019,000 |  | 52,019,000 |  | 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 | 2,019,000 |  | 2,019,000 |  |
Astellas [Member] | Europe [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Unbilled contract asset | 130,000,000.0 |  | 130,000,000.0 |  |
Net unbilled contract asset | 128,000,000.0 |  | 128,000,000.0 |  |
Deferred Revenue | 2,000,000.0 |  | 2,000,000.0 |  |
Astellas [Member] | Collaborative Arrangement [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenue related to collaboration agreements | 134,700,000 | $ 20,500,000 | 139,600,000 | $ 25,600,000 |
Expense related to collaboration agreements | 800,000 | $ 200,000 | 1,300,000 | $ 700,000 |
Accounts receivable from related party | 4,300,000 |  | 4,300,000 |  | 47,200,000
Accrued liabilities to related party | $ 800,000 |  | $ 800,000 |  | 400,000
Astellas [Member] | Astellas Agreement [Member] | API Shipment [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Accrued liabilities to related party |  |  |  |  | $ 43,800,000

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