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GEOGRAPHIC AND SEGMENT INFORMATION - Geographic (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]    
Sales $ 27,711 $ 28,235
Domestic    
Segment Reporting Information [Line Items]    
Sales 18,812 19,584
International    
Segment Reporting Information [Line Items]    
Sales $ 8,899 $ 8,651