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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Risk (Details) - customer
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenues | Customer concentration    
Credit concentrations and significant customers    
Number of customers 1 1
Revenues | Customer concentration | Customer One    
Credit concentrations and significant customers    
Percentage of concentration risk 10.00% 11.00%
Accounts receivable | Credit concentration    
Credit concentrations and significant customers    
Number of customers 2  
Accounts receivable | Credit concentration | Customer Two | Minimum    
Credit concentrations and significant customers    
Percentage of concentration risk 10.00%