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SEGMENT INFORMATION - Narrative (Details) - product
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]    
Number of products represented of total revenue 10 10
Product Concentration Risk | Revenues | Customer, Top Ten Products    
Disaggregation of Revenue [Line Items]    
Concentration risk percentage 42.00% 41.00%