Inventories, net (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of Inventory reserves
Ending Balance	$ 2,553	$ 2,314
Inventory Valuation Reserve [Member]
Summary of Inventory reserves
Beginning Balance	2,314	2,410	2,012
Provision	420	316	735
Write-offs	(181)	(412)	(337)
Ending Balance	$ 2,553	$ 2,314	$ 2,410