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
Mar. 31, 2018
Dec. 31, 2017
Accrued Liabilities Current [Abstract]    
General and administrative $ 670 $ 374
Clinical costs 734 702
Non-clinical research 868 435
Payroll related 491 1,149
Other accrued expenses 37 30
Total accrued liabilities $ 2,800 $ 2,690