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GEOGRAPHIC AND SEGMENT INFORMATION - Geographic (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Sales $ 11,224 $ 4,296 $ 19,862 $ 9,293
Domestic        
Segment Reporting Information [Line Items]        
Sales 7,383 3,393 12,949 7,011
International        
Segment Reporting Information [Line Items]        
Sales $ 3,841 $ 903 $ 6,913 $ 2,282