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Collaboration Agreements and Revenues - Roll-forward of Related Contract Liabilities (Detail)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
USD ($)
Contract with Customer Liability [Line Items]  
Balance at December 31, 2020 $ (2,147)
Balance at June 30, 2021 (5,256)
AstraZeneca Agreements [Member]  
Contract with Customer Liability [Line Items]  
Balance at December 31, 2020 (137,338)
Additions (34,588)
Recognized as Revenue 22,167
Balance at June 30, 2021 (149,759)
Product Revenue, Net [Member] | Direct Sales [Member] | Contract Liabilities [Member]  
Contract with Customer Liability [Line Items]  
Balance at December 31, 2020 (15,137)
Additions (883)
Deduction 2,410
Currency Translation and Other (183)
Balance at June 30, 2021 (13,793)
Drug Product Revenue [Member]  
Contract with Customer Liability [Line Items]  
Balance at December 31, 2020 (5,984)
Additions (24,904)
Recognized as Revenue 0
Balance at June 30, 2021 (30,888)
Drug Product Revenue [Member] | AstraZeneca Agreements [Member] | U.S. [Member]  
Contract with Customer Liability [Line Items]  
Balance at December 31, 2020 0
Additions (11,171)
Recognized as Revenue 0
Balance at June 30, 2021 (11,171)
Drug Product Revenue [Member] | Astellas Agreement [Member] | Japan [Member]  
Contract with Customer Liability [Line Items]  
Balance at December 31, 2020 0
Additions (1,974)
Recognized as Revenue 0
Balance at June 30, 2021 (1,974)
Drug Product Revenue [Member] | Astellas Agreement [Member] | Europe [Member]  
Contract with Customer Liability [Line Items]  
Balance at December 31, 2020 (5,984)
Additions (11,759)
Recognized as Revenue 0
Balance at June 30, 2021 $ (17,743)