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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
Aug. 31, 2020
May 31, 2020
Apr. 30, 2017
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]          
Total capacity   $ 35.0 $ 45.0    
Fixed interest rate, annual   14.00% 10.00%    
Percent of capacity usage for financing of hardware purchases 70.00% 85.00% 100.00%    
Outstanding balance       $ 9.6 $ 7.4