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Balance Sheet Components - Schedule of Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accrued Liabilities Current [Abstract]    
Preclinical and clinical trial accruals $ 35,413 $ 32,321
Payroll and related accruals 21,430 18,810
Property taxes and other 1,095 4,201
Professional services 2,648 1,991
Other 5,537 6,458
Total accrued liabilities $ 66,123 $ 63,781