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Balance Sheet Components - Schedule of Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Accrued Liabilities Current [Abstract]    
Preclinical and clinical trial accruals $ 32,054 $ 27,973
Payroll and related accruals 10,285 13,535
Professional services 1,041 1,662
Other 4,562 4,762
Total accrued liabilities $ 47,942 $ 47,932