Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Raw materials	$ 4,720	$ 6,310
Work in progress	4,056	4,168
Finished goods	4,099	3,552
Supplies	846	784
Total Inventories	13,721	14,814
Inventory reserve	(882)	(826)
Net Inventories	$ 12,839	$ 13,988