Annual report pursuant to Section 13 and 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
Dec. 31, 2018
Dec. 31, 2017
Accrued Liabilities Current [Abstract]    
General and administrative $ 297 $ 374
Clinical trial related costs 598 702
Non-clinical research and manufacturing operations 2,644 435
Payroll related 1,787 1,149
Other accrued expenses 31 30
Total accrued liabilities $ 5,357 $ 2,690