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Balance Sheet Components - Schedule of Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Accrued Liabilities Current [Abstract]    
Preclinical and clinical trial accruals $ 41,546 $ 35,413
Payroll and related accruals 17,604 21,430
Property taxes and other 2,389 1,095
Professional services 4,063 2,648
Other 5,223 5,537
Total accrued liabilities $ 70,825 $ 66,123