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RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 09, 2021 | Dec. 31, 2020 | Dec. 31, 2021
Related Party Transaction [Line Items] |  |  |
Deferred revenue |  | $ 0 | $ 3,663
Common Stock | Legacy ESS |  |  |
Related Party Transaction [Line Items] |  |  |
Shares issued to related parties (in shares) | 15,674,965 |  |
Related parties | Common Stock | Legacy ESS |  |  |
Related Party Transaction [Line Items] |  |  |
Shares issued to related parties (in shares) | 6,707,318 |  |
Technology Consulting |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction amount |  | $ 31 |
Energy Warehouse Sales |  |  |
Related Party Transaction [Line Items] |  |  |
Accounts receivable from related party |  |  | 66
Deferred revenue |  |  | $ 171

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