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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

X

- Definition

The percentage of hardware for energy storage systems which the loan is intended to purchase.

+ References

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- Definition

The effective interest rate during the reporting period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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