Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 4,672	$ 5,049
Finished goods	9,527	10,016
Reserves for excess, obsolete, and slow moving inventories and valuation reserves	(5,758)	(5,596)
Inventories, net	$ 8,441	$ 9,469