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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable (Details)
12 Months Ended
Dec. 31, 2020
Minimum  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Accounts receivable, required payment terms 30 days
Maximum  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Accounts receivable, required payment terms 90 days