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, 2015
Dec. 31, 2014
Accrued Liabilities Current [Abstract]    
Payroll and employee related expenses $ 593 $ 2,808
Accrued severance benefits 2,280  
Professional services 163 331
Other accrued expenses 233 41
Total accrued liabilities $ 3,269 $ 3,180