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SPECIAL PURPOSE ENTITIES (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |
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
Energy Storage Systems |  |  |
Variable Interest Entity [Line Items] |  |  |
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
SCF 1 |  |  |
Variable Interest Entity [Line Items] |  |  |
Deferred revenue, current |  | 283 | 283
Deferred revenue, noncurrent |  | 1,047 | 1,369
Other liabilities |  | 239 | 307
SCF 1 | Energy Storage Systems |  |  |
Variable Interest Entity [Line Items] |  |  |
Energy storage systems, net |  | $ 1,463 | $ 1,785

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