For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

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Name:	us-gaap_AccountsReceivableRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands	Nov. 09, 2021	Mar. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Deferred revenue		$ 6,859	$ 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 Warehouse Sales
Related Party Transaction [Line Items]
Accounts receivable from related party			66
Deferred revenue		$ 237	$ 171