Product Warranty (Details Textual) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Minimum [Member]	Mar. 31, 2014 Maximum [Member]
Product Warranty (Textual) [Abstract]
Limited warranty period on product			1 year	2 years
Accrued product warranty costs	$ 1,367	$ 1,269