Inventories - Schedule of Inventory (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 4,041	$ 3,316
Finished goods	8,229	6,598
Reserve for excess, obsolete, and slow moving inventories	(4,212)	(4,196)
Inventories, net	8,058	5,718
Increase in gross inventory levels	2,400	(5,200)
Provision for slow-moving and obsolete inventories	$ 17	$ (1,400)	$ 3,281