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Collaboration Agreements and Revenues - Transaction Price Related to Consideration Received and Accounts Receivable Allocated to Performance Obligations along with Associated Deferred Revenue (Parenthetical) (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Deferred revenue | $ 138,474 | $ 99,449
Deferred revenue | 2,147 | 54,790
Net unbilled co-development revenue | 0 | $ 125,210
AstraZeneca Agreements [Member] | U.S./RoW [Member] |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Deferred revenue | 137,500 |
Deferred revenue | 139,600 |
Net unbilled co-development revenue | $ 2,100 |

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