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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Customer concentrations (Details) - Customer Concentration Risk [Member]
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Revenues [Member] | Customer [Member]            
Concentration Risk, Percentage   88.00% 73.00% 81.00% 56.00%  
Revenues [Member] | Customer A [Member]            
Concentration Risk, Percentage   88.00%   41.00%    
Revenues [Member] | Customer B [Member]            
Concentration Risk, Percentage     26.00%      
Revenues [Member] | Customer C [Member]            
Concentration Risk, Percentage         12.00%  
Revenues [Member] | Customer D [Member]            
Concentration Risk, Percentage       40.00%    
Revenues [Member] | Customer E [Member]            
Concentration Risk, Percentage     35.00%   44.00%  
Revenues [Member] | Customer F [Member]            
Concentration Risk, Percentage     12.00%      
Accounts Receivable [Member] | Customer [Member]            
Concentration Risk, Percentage 96.00%         99.00%
Accounts Receivable [Member] | Customer A [Member]            
Concentration Risk, Percentage 96.00%          
Accounts Receivable [Member] | Customer B [Member]            
Concentration Risk, Percentage           70.00%
Accounts Receivable [Member] | Customer G [Member]            
Concentration Risk, Percentage           19.00%
Accounts Receivable [Member] | Customer H [Member]            
Concentration Risk, Percentage           10.00%
Accounts Payable [Member] | Vendor [Member]            
Concentration Risk, Percentage   48.00% 53.00% 22.00% 41.00%  
Accounts Payable [Member] | Vendor A [Member]            
Concentration Risk, Percentage     29.00%   17.00%  
Accounts Payable [Member] | Vendor B [Member]            
Concentration Risk, Percentage     13.00%      
Accounts Payable [Member] | Vendor C [Member]            
Concentration Risk, Percentage         11.00%  
Accounts Payable [Member] | Vendor D [Member]            
Concentration Risk, Percentage         13.00%  
Accounts Payable [Member] | Vendor E [Member]            
Concentration Risk, Percentage     11.00%      
Accounts Payable [Member] | Vendor F [Member]            
Concentration Risk, Percentage       11.00%    
Accounts Payable [Member] | Vendor G [Member]            
Concentration Risk, Percentage   26.00%   11.00%    
Accounts Payable [Member] | Vendor H [Member]            
Concentration Risk, Percentage   10.00%        
Accounts Payable [Member] | Vendor I [Member]            
Concentration Risk, Percentage   12.00%