Balance Sheet Accounts (Schedule of Product Warranty Liability Activity) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance beginning of period			$ 7,551	$ 3,296
New warranties issued	2,265	1,304
Warranty expenditures	(1,927)	(1,160)
Balance end of period	$ 7,889	$ 3,440	$ 7,551	$ 3,296