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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 855 $ 543
Finished goods 815 863
Inventory gross, Total 1,670 1,406
Allowance for excess inventory quantities (21) (21)
Total $ 1,649 $ 1,385