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SIGNIFICANT ACCOUNTING POLICIES - SUMMARY OF INVENTORY (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Raw materials $ 5,163 $ 4,521
Finished goods 3,276 3,048
Gross inventories 8,439 7,569
Less: reserve for obsolescence (1,913) (1,411)
Inventories, net $ 6,526 $ 6,158