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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Related Party Transaction [Line Items]          
Accounts receivable from related party $ 5,461   $ 5,461   $ 5,033
Accrued liabilities to related parties 3,532   3,532   4,594
Astellas [Member] | Collaborative Arrangement [Member]          
Related Party Transaction [Line Items]          
Revenue related to collaboration agreements 6,000 $ 4,400 16,900 $ 12,500  
Expense related to collaboration agreements 3,400 $ 2,600 7,800 $ 7,100  
Accounts receivable from related party 5,500   5,500   5,000
Accrued liabilities to related parties $ 3,400   $ 3,400   $ 4,300