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Balance Sheet Components - Schedule of Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Accrued Liabilities Current [Abstract]    
Preclinical and clinical trial accruals $ 22,606 $ 32,321
Payroll and related accruals 16,626 18,810
Property taxes and other 1,900 4,201
Professional services 1,835 1,991
Other 9,631 6,458
Total accrued liabilities $ 52,598 $ 63,781