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GEOGRAPHIC AND SEGMENT INFORMATION - Geographic (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information [Line Items]        
Sales $ 11,831 $ 6,954 $ 31,693 $ 16,247
Domestic        
Segment Reporting Information [Line Items]        
Sales 7,911 5,214 20,860 12,225
International        
Segment Reporting Information [Line Items]        
Sales $ 3,920 $ 1,740 $ 10,833 $ 4,022