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GEOGRAPHIC AND SEGMENT INFORMATION - GEOGRAPHIC (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Segment Reporting Information [Line Items]    
Sales $ 5,823 $ 3,397
Domestic    
Segment Reporting Information [Line Items]    
Sales 4,104 2,758
International    
Segment Reporting Information [Line Items]    
Sales $ 1,719 $ 639