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Document and Entity Information
Oct. 08, 2021
Document And Entity Information [Line Items]  
Document Type 8-K
Document Period End Date Oct. 08, 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
Current Fiscal Year End Date --12-31
Amendment Flag false
Entity Central Index Key 0001819438
Former Address [Member]  
Document And Entity Information [Line Items]  
Entity Address, Address Line One 1133 Connecticut Avenue NW
Entity Address, Address Line Two Ste. 700
Entity Address, City or Town Washington
Entity Address, State or Province DC
Entity Address, Postal Zip Code 20036
City Area Code 202
Local Phone Number 454-1100
Common Stock, $0.0001 par value per share [Member]  
Document And Entity Information [Line Items]  
Title of 12(b) Security Common stock, par value $0.0001 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