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Balance Sheet Components - Accrued Compensation (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Balance Sheet Components    
Accrued paid time off $ 1,952 $ 2,024
Accrued commissions 3,170 3,691
Accrued bonuses 1,695 1,348
Other accrued compensation 2,278 1,489
Total accrued compensation $ 9,095 $ 8,552