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Balance Sheet Components - Schedule of Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accrued Liabilities Current [Abstract]    
Preclinical and clinical trial accruals $ 41,104 $ 35,413
Payroll and related accruals 14,001 21,430
Property taxes and other 1,778 1,095
Professional services 3,588 2,648
Other 6,074 5,537
Total accrued liabilities $ 66,545 $ 66,123