Balance Sheet Components - Warranty Accrual (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Balance Sheet Components [Abstract]
Warranty term on hardware products (in years)	1 year
Warranty term on software embedded products (in days)	90 days
Warranty [Roll Forward]
Warranty accrual, beginning of period	$ 6,744	$ 4,718
Liabilities accrued for warranties issued during the period	5,020	3,420
Warranty costs incurred during the period	(3,478)	(2,541)
Warranty accrual, end of period	$ 8,286	$ 5,597