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
Mar. 31, 2019
Dec. 31, 2018
Payables And Accruals [Abstract]    
Accrued bonuses $ 754 $ 4,780
Accrued wages and other payroll related items 4,515 3,494
Accrued vacation 2,124 1,959
Accrued employee stock purchase plan deductions 439 1,174
Accrued payroll $ 7,832 $ 11,407