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, 2017
Dec. 31, 2016
Accrued Liabilities Current [Abstract]    
Clinical costs $ 712 $ 409
Bridge note interest 0 201
Payroll related 627 553
Consulting and professional fees 103 26
Other accrued expenses 58 21
Total accrued liabilities $ 1,500 $ 1,210