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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Concentration Risk (Details) - Revenue from Contract with Customer Benchmark - Customer Concentration Risk
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Customer A        
Concentration Risk [Line Items]        
Concentration risk, percentage 23.00% 20.00% 23.00% 21.00%
Customer C        
Concentration Risk [Line Items]        
Concentration risk, percentage   13.00%   12.00%
Customer D        
Concentration Risk [Line Items]        
Concentration risk, percentage       10.00%