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Balance Sheet Components - Components of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Payables And Accruals [Abstract]    
Accrued vacation $ 1,923 $ 1,642
Accrued payroll and related expenses 5,627 6,179
Accrued ESPP contributions 1,029 417
Accrued professional services fees 555 636
Other 2,302 1,291
Total accrued liabilities $ 11,436 $ 10,165