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, 2016
Dec. 31, 2015
Accrued Liabilities Current [Abstract]    
Payroll and employee related expenses $ 416 $ 593
Accrued severance benefits 0 2,280
Professional services 425 163
Other accrued expenses 47 233
Total accrued liabilities $ 888 $ 3,269