Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 4,263	$ 5,049
Finished goods	7,468	10,016
Reserves for excess, obsolete, and slow moving inventories and valuation reserves	(4,952)	(5,596)
Inventories, net	$ 6,779	$ 9,469