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LEGACY ESS REDEEMABLE CONVERTIBLE PREFERRED STOCK - Schedule of Warrant Valuation Assumptions (Details) - Legacy ESS | Dec. 31, 2021 yr | Dec. 31, 2020 yr
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Expected volatility | Series B Preferred Warrants |  |
Class of Warrant or Right [Line Items] |  |
Warrant valuation assumption | 0.80 | 0.80
Expected volatility | Series B Preferred Warrants | Minimum |  |
Class of Warrant or Right [Line Items] |  |
Warrant valuation assumption | 0.60 |
Expected volatility | Series B Preferred Warrants | Maximum |  |
Class of Warrant or Right [Line Items] |  |
Warrant valuation assumption | 0.80 |
Expected volatility | Preferred C warrants |  |
Class of Warrant or Right [Line Items] |  |
Warrant valuation assumption |  | 0.80
Expected term (in years) | Series B Preferred Warrants |  |
Class of Warrant or Right [Line Items] |  |
Warrant valuation assumption | 2.00 | 2.00
Expected term (in years) | Preferred C warrants |  |
Class of Warrant or Right [Line Items] |  |
Warrant valuation assumption | 2.00 | 2.00
Risk‑free interest rate | Series B Preferred Warrants |  |
Class of Warrant or Right [Line Items] |  |
Warrant valuation assumption |  | 0.0013
Risk‑free interest rate | Series B Preferred Warrants | Minimum |  |
Class of Warrant or Right [Line Items] |  |
Warrant valuation assumption | 0.0016 |
Risk‑free interest rate | Series B Preferred Warrants | Maximum |  |
Class of Warrant or Right [Line Items] |  |
Warrant valuation assumption | 0.0028 |
Risk‑free interest rate | Preferred C warrants |  |
Class of Warrant or Right [Line Items] |  |
Warrant valuation assumption |  | 0.0013
Risk‑free interest rate | Preferred C warrants | Minimum |  |
Class of Warrant or Right [Line Items] |  |
Warrant valuation assumption | 0.0016 |
Risk‑free interest rate | Preferred C warrants | Maximum |  |
Class of Warrant or Right [Line Items] |  |
Warrant valuation assumption | 0.0032 |
Dividend yield | Series B Preferred Warrants |  |
Class of Warrant or Right [Line Items] |  |
Warrant valuation assumption | 0 | 0
Dividend yield | Preferred C warrants |  |
Class of Warrant or Right [Line Items] |  |
Warrant valuation assumption | 0 | 0

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- Definition Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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