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Collaboration Agreements, License Agreement and Revenues - Transaction Price Related to Consideration Received and Accounts Receivable Allocated to Performance Obligations Deferred Revenue (Parenthetical) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]    
Deferred revenue, net of current ($10,604 and $4,636 to a related party) $ 162,415 $ 138,474
Deferred Revenue 7,003 2,147
Net unbilled co-development revenue 8,000 0
AstraZeneca Agreements [Member]    
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]    
Deferred Revenue 160,267 $ 137,338
Net unbilled co-development revenue 7,000  
AstraZeneca Agreements [Member] | U.S./RoW [Member]    
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]    
Deferred revenue, net of current ($10,604 and $4,636 to a related party) 154,700  
Deferred Revenue 161,700  
Net unbilled co-development revenue $ 7,000