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GEOGRAPHIC AND SEGMENT INFORMATION - Narrative (Details) - segment
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting [Abstract]        
Number of reportable segments     2  
Number of operating segments     2  
International sales, percent of total revenue 33.10% 25.00% 34.20% 24.80%