Schedule of Product Liability (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Product warranty accrual, at the beginning of the period	$ 582	$ 202	$ 840	$ 297
Warranty expenses accrued	132	175	619	349
Product Warranty Accrual, Preexisting, Increase (Decrease)	250	203	275	430
Warranty settlements made	(118)	(367)	(888)	(863)
Product warranty accrual, at the end of period	$ 846	$ 213	$ 846	$ 213