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Balance Sheet Components - Schedule of Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accrued Liabilities Current [Abstract]    
Preclinical and clinical trial accruals $ 32,321 $ 29,550
Payroll and related accruals 18,810 14,232
Property taxes and other 4,201 451
Professional services 1,991 1,252
Other 6,458 5,429
Total accrued liabilities $ 63,781 $ 50,914