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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable Concentration Risk (Details) - Accounts Receivable - Customer Concentration Risk
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Customer A    
Concentration Risk [Line Items]    
Concentration risk, percentage 15.00% 31.00%
Customer B    
Concentration Risk [Line Items]    
Concentration risk, percentage   20.00%