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GEOGRAPHIC AND SEGMENT INFORMATION - GEOGRAPHIC (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting Information [Line Items]    
Sales $ 8,389 $ 7,775
Domestic    
Segment Reporting Information [Line Items]    
Sales 6,992 6,615
International    
Segment Reporting Information [Line Items]    
Sales $ 1,397 $ 1,160