Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components - Components of Accrued Liabilities (Detail)

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Balance Sheet Components - Components of Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Accrued Liabilities Current [Abstract]    
General and administrative $ 848 $ 374
Clinical trial related costs 1,441 702
Non-clinical research and manufacturing operations 3,078 435
Payroll related 1,204 1,149
Other accrued expenses 24 30
Total accrued liabilities $ 6,595 $ 2,690