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Document and Entity Information
Sep. 30, 2021
Document And Entity Information [Line Items]  
Document Type 8-K/A
Document Period End Date Sep. 30, 2021
Entity Registrant Name ESS TECH, INC.
Entity Incorporation, State or Country Code DE
Entity File Number 001-39525
Entity Tax Identification Number 98-1550150
Entity Address, Address Line One 26440 SW Parkway Ave.
Entity Address, Address Line Two Bldg. 83
Entity Address, City or Town Wilsonville
Entity Address, State or Province OR
Entity Address, Postal Zip Code 97070
City Area Code 855
Local Phone Number 423-9920
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Entity Ex Transition Period false
Amendment Flag true
Entity Central Index Key 0001819438
Amendment Description This Amendment No. 1 to Current Report on Form 8-K/A (“Amendment No. 1”) amends the Current Report on Form 8-K of ESS Tech, Inc., a Delaware corporation (the “Company”), filed on October 15, 2021 (the “Original Report”), in which the Company reported, among other events, the completion of the Merger (as defined in the Original Report). This Amendment No. 1 is being filed in order to include (a) the unaudited condensed financial statements of ESS Tech Subsidiary, Inc., f/k/a ESS Tech, Inc., a Delaware corporation (“Legacy ESS”), as of September 30, 2021 and for the three and nine months ended September 30, 2021 and 2020, (b) Management’s Discussion and Analysis of Financial Condition and Results of Operations of Legacy ESS for the three and nine months ended September 30, 2021 and 2020, and (c) the unaudited pro forma condensed combined financial information as of and for the nine months ended September 30, 2021 and for the year ended December 31, 2020. This Amendment No. 1 does not amend any other item of the Original Report or purport to provide an update or a discussion of any developments at the Company or its subsidiaries, including Legacy ESS, subsequent to the filing date of the Original Report. The information previously reported in or filed with the Original Report is hereby incorporated by reference into this Form 8-K/A.
Common Stock, $0.0001 par value per share [Member]  
Document And Entity Information [Line Items]  
Title of 12(b) Security Common Stock, $0.0001 par value per share
Trading Symbol GWH
Security Exchange Name NYSE
Redeemable warrants included as part of the units, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 [Member]  
Document And Entity Information [Line Items]  
Title of 12(b) Security Warrants, each whole warrant exercisable for one share of common stock at an exercise price of $11.50
Trading Symbol GWH.W
Security Exchange Name NYSE