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LEGACY ESS REDEEMABLE CONVERTIBLE PREFERRED STOCK - Schedule of Warrants Outstanding (Details) - shares | Dec. 31, 2021 | Oct. 07, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Class of Warrant or Right [Line Items] |  |  |
Warrants (in shares) | 11,461,247 |  | 0
Legacy ESS |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrants (in shares) | 0 |  | 2,560,568
Common Stock Warrants | Legacy ESS |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrants (in shares) | 0 |  | 450,153
Series B Preferred Warrants | Legacy ESS |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrants (in shares) | 0 | 100,161 | 2,007,308
Series C-1 Preferred Warrants | Legacy ESS |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrants (in shares) | 0 |  | 103,107

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