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Collaboration Agreements - Summary of Revenue Recognized under Agreement (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]      
Total license and milestone revenue $ 148,093 $ 117,191 $ 94,961
Collaboration services and other revenue from a related party 32,735 20,410 7,209
Revenue recognized 180,828 137,601 102,170
Europe [Member]      
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]      
Revenue recognized 159,123 119,559 76,478
Astellas Agreement [Member]      
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]      
Total license and milestone revenue 18,701 14,453 22,326
Collaboration services and other revenue from a related party 2,895 3,535 3,335
Astellas Agreement [Member] | Japan [Member]      
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]      
License revenue 1,024 518 566
Milestones revenue 0 0 12,500
Total license and milestone revenue 1,024 518 13,066
Collaboration services and other revenue from a related party 198 356 433
Astellas Agreement [Member] | Europe [Member]      
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]      
License revenue 17,677 13,935 9,260
Milestones revenue 0 0 0
Total license and milestone revenue 17,677 13,935 9,260
Collaboration services and other revenue from a related party 2,697 3,179 2,902
AstraZeneca Agreements [Member] | China-single unit of accounting [Member]      
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]      
Revenue recognized 0 0 0
AstraZeneca Agreements [Member] | U.S./RoW [Member]      
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]      
License revenue 114,392 102,738 72,635
Milestones revenue 15,000 0 0
Total license and milestone revenue 129,392 102,738 72,635
Collaboration services and other revenue from a related party $ 29,731 $ 16,820 $ 3,843