Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components - Schedule of Accrued Payroll (Details)

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Balance Sheet Components - Schedule of Accrued Payroll (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Payables And Accruals [Abstract]    
Accrued bonuses $ 5,141 $ 3,086
Accrued wages and other payroll related items 4,597 1,746
Accrued vacation 1,861 1,338
Accrued employee stock purchase plan deductions 305 707
Accrued payroll $ 11,904 $ 6,877