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GEOGRAPHIC AND SEGMENT INFORMATION - Narrative (Details) - segment
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting [Abstract]        
Number of reportable segments     2  
Number of operating segments     2  
International sales, percent of total revenue 34.20% 21.00% 34.80% 24.60%