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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - segment
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Concentration Risk [Line Items]          
Number of operating segments     1    
Accounts Receivable | Customer Concentration Risk | Customer A          
Concentration Risk [Line Items]          
Concentration risk, percentage         30.00%
Accounts Receivable | Customer Concentration Risk | Customer B          
Concentration Risk [Line Items]          
Concentration risk, percentage         20.00%
Accounts Receivable | Customer Concentration Risk | Customer C          
Concentration Risk [Line Items]          
Concentration risk, percentage     18.00%   17.00%
Accounts Receivable | Customer Concentration Risk | Customer H          
Concentration Risk [Line Items]          
Concentration risk, percentage     12.00%    
Accounts Receivable | Customer Concentration Risk | Customer I          
Concentration Risk [Line Items]          
Concentration risk, percentage     12.00%    
Revenue | Customer Concentration Risk | Customer A          
Concentration Risk [Line Items]          
Concentration risk, percentage     11.00%    
Revenue | Customer Concentration Risk | Customer C          
Concentration Risk [Line Items]          
Concentration risk, percentage 22.00%   12.00%    
Revenue | Customer Concentration Risk | Customer D          
Concentration Risk [Line Items]          
Concentration risk, percentage     13.00%    
Revenue | Customer Concentration Risk | Customer H          
Concentration Risk [Line Items]          
Concentration risk, percentage 15.00% 32.00% 11.00% 17.00%