Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Classification of inventories [Abstract]
Raw materials	$ 1,668	$ 1,526
Work in process	1,585	1,337
Finished goods	755	1,012
Total Inventories, net	4,008	3,875
Inventory reserve for obsolescence	$ 1,263	$ 1,213