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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 | Jun. 30, 2021 | Dec. 31, 2020
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Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Deferred revenue, net of current ($9,381 and $4,636 to a related party) | $ 152,865 | $ 138,474
Deferred Revenue | 5,256 | 2,147
Net unbilled co-development revenue | 0 | 0
AstraZeneca Agreements [Member] |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Deferred Revenue | 149,759 | $ 137,338
Net unbilled co-development revenue | 5,300 |
AstraZeneca Agreements [Member] | U.S./RoW [Member] |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Deferred revenue, net of current ($9,381 and $4,636 to a related party) | 146,800 |
Deferred Revenue | 152,100 |
Net unbilled co-development revenue | $ 5,300 |

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