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NOTES PAYABLE - Revolving Loan Due to SPE Member (Details) - Line of Credit - Revolving Loan Due To SPE Member - USD ($)
$ in Millions
1 Months Ended
Aug. 31, 2020
May 31, 2020
Apr. 30, 2017
Dec. 31, 2020
Debt Instrument [Line Items]        
Total capacity   $ 35.0 $ 45.0  
Fixed interest rate, annual     10.00%  
Percent of capacity usage for financing of hardware purchases 0.70% 0.85% 1.00%  
Outstanding balance       $ 7.4
Debt Terms, One        
Debt Instrument [Line Items]        
Fixed interest rate, annual   14.00%    
Period threshold for interest rate   9 months