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GEOGRAPHIC AND SEGMENT INFORMATION - GEOGRAPHIC (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]    
Sales $ 9,916 $ 8,389
Domestic    
Segment Reporting Information [Line Items]    
Sales 7,973 6,992
International    
Segment Reporting Information [Line Items]    
Sales $ 1,943 $ 1,397