BUSINESS COMBINATION (Details) - $ / shares	Nov. 09, 2021	Oct. 08, 2021	Mar. 31, 2022	Dec. 31, 2021	Oct. 07, 2021
Business Acquisition [Line Items]
Common stock, par value (in USD per share)		$ 0.0001	$ 0.0001	$ 0.0001
Preferred stock, par value (in USD per share)		$ 0.0001	$ 0.0001	$ 0.0001
Common and preferred stock authorized (in shares)		2,200,000,000
Common stock, shares authorized (in shares)		2,000,000,000	2,000,000,000	2,000,000,000
Preferred stock, shares authorized (in shares)		200,000,000	200,000,000	200,000,000
Common Stock
Business Acquisition [Line Items]
Shares issuable under contingent consideration (in shares)		16,500,000
Legacy ESS
Business Acquisition [Line Items]
Common stock, par value (in USD per share)					$ 0.0001
Preferred stock, par value (in USD per share)					$ 0.0001
Legacy ESS | Common Stock
Business Acquisition [Line Items]
Shares issued upon completion of milestones (in shares)	15,674,965
Legacy ESS Shareholders
Business Acquisition [Line Items]
Shares issued (in shares)		99,700,326
Legacy ESS Shareholders | Transaction Expense Adjustment
Business Acquisition [Line Items]
Shares issued (in shares)		125,958