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DEBT - Sale of Long - Term Financing Receivables (Details) - Financing Receivable - Financing Receivable Recorded As Debt - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]        
Proceeds from debt, net of issuance costs $ 2,800 $ 5,600    
Long-term debt, gross     $ 558 $ 1,925