Balance Sheet Components Balance sheet components Product Warranties (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
movement in std product warranty liability [Roll Forward]
Warranty balance at the beginning of the period	$ 297	$ 983	$ 605
Warranty expense accrued for shipments in period		540
Changes in liability related to pre-existing warranties	536		50
Warranty settlements made		(984)
Warranty balance at the end of the period	$ 840	$ 297	$ 983