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Balance Sheet Components - Schedule of Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Accrued Liabilities Current [Abstract]    
Preclinical and clinical trial accruals $ 31,052 $ 29,550
Payroll and related accruals 9,050 14,232
Professional services 1,434 1,252
Other 7,643 5,880
Total accrued liabilities $ 49,179 $ 50,914