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v3.21.1

NOTES PAYABLE - Revolving Loan Due to SPE Member (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2020 | Aug. 31, 2020 | May 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revolving Loan Due to SPE Member |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Balance outstanding, end of period |  |  |  |  | $ 45,000 |
Notes payable |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Balance outstanding, end of period |  |  |  | $ 38,295 |  |
Notes payable | Revolving Loan Due to SPE Member |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loan finance percentage of hardware for energy systems | 85.00% | 70.00% | 100.00% | 100.00% |  |
Loan capacity |  |  | $ 35,000 |  |  | $ 35,000
Fixed interest rate |  |  | 14.00% |  | 10.00% |
Balance outstanding, end of period |  |  |  | $ 7,400 | $ 19,600 |

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