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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