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RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands		12 Months Ended
	Nov. 09, 2021	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Deferred revenue		$ 6,168	$ 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
Energy Storage Systems Sales
Related Party Transaction [Line Items]
Accounts receivable from related party			66
Deferred revenue			$ 171
Revenue recognized from sales to related parties		284
Energy Warehouse Sales
Related Party Transaction [Line Items]
Deferred revenue		$ 5

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