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SPECIAL PURPOSE ENTITIES - Additional information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |
Loans Payable, Current | $ 18,052 |  | $ 14,914 | $ 6,373
Loans Payable, Noncurrent | 70,059 |  | 73,128 | 74,640
Interest Expense | 6,233 | $ 4,369 | 20,806 | 12,548
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |
Energy storage systems, net | 119,842 |  | 123,703 | 131,569
Deferred revenue, current | 38,762 |  | 36,942 | 10,948
Deferred revenue, noncurrent | $ 16,640 |  | 15,468 | 9,780
Unconsolidated SPEs |  |  |  |
Related Party Transactions |  |  |  |
Revenues recognized associated with sales to the unconsolidated SPEs |  |  | 12,800 | 8,800
Cost of service recognized associated with sales to the unconsolidated SPEs |  |  | 11,800 | 7,100
Energy Storage Systems |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |
Energy storage systems, net |  |  | 91,593 | 98,358
Deferred revenue, current |  |  | 3,713 | 3,507
Deferred revenue, noncurrent |  |  | 8,265 | 6,302
Other liabilities |  |  | 3,178 | 2,608
Financing obligation |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Loans Payable, Current |  |  | 14,914 | 6,373
Loans Payable, Noncurrent |  |  | 73,128 | 74,640
Interest Expense |  |  | $ 6,900 | $ 5,800

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