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Balance Sheet Components - Warranty Accrual (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2012
Warranty [Roll Forward]
Warranty accrual, beginning of period	$ 3,204		$ 5,075
Liabilities accrued for warranties issued during the period	783	488
Warranty costs incurred during the period	(301)us-gaap_ProductWarrantyAccrualPayments	(908)us-gaap_ProductWarrantyAccrualPayments
Warranty accrual, end of period	$ 3,686	$ 4,655	$ 5,075
Hardware
Guarantor Obligations [Line Items]
Warranty Period	1 year
Software embedded in products
Guarantor Obligations [Line Items]
Warranty Period	90 days

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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