Balance Sheet Components - Warranty Accrual (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Warranty [Roll Forward]
Warranty accrual, beginning of period	$ 5,075	$ 5,314
Liabilities accrued for warranties issued during the period	1,839	4,192
Warranty costs incurred during the period	(1,689)	(2,605)
Adjustments related to change in estimate	(1,761)	0
Warranty accrual, end of period	$ 3,464	$ 6,901
Hardware
Guarantor Obligations [Line Items]
Warranty Period	1 year
Software embedded in products
Guarantor Obligations [Line Items]
Warranty Period	90 days