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Balance Sheet Components - Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Payables And Accruals [Abstract]    
Payroll and related $ 3,818 $ 2,296
Preclinical and clinical 8,803 4,376
Professional services 114 69
Other 164 415
Total $ 12,899 $ 7,156