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LEGACY ESS REDEEMABLE CONVERTIBLE PREFERRED STOCK - Narrative (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Oct. 08, 2021
USD ($)
$ / shares
shares
Oct. 07, 2021
$ / shares
shares
Mar. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
May 07, 2021
$ / shares
Dec. 31, 2019
USD ($)
Jul. 31, 2018
$ / shares
Temporary Equity [Line Items]                
Recapitalization exchange ratio 0.0147              
Fair value of temporary equity | $       $ 0 $ 0   $ 0  
Shares issued (in shares) 25,000,000              
Value of share issued | $       29,516        
Stock issuance costs | $       $ 7,895 0      
Warrants issued (in shares)       12,416,621        
Warrants exercised (in shares)       955,374        
Transaction value | $       $ 0 153      
Increase in derivative liability | $       (223,165) (11,532)      
Derivative liabilities | $       $ 0 $ 22,911      
Warrants (in shares)       11,461,247 0      
Series B Preferred Warrants                
Temporary Equity [Line Items]                
Warrant exercise price (in USD per share) | $ / shares               $ 0.96
Warrants term               10 years
Series C-2 Redeemable Convertible Preferred Stock Purchase Rights And Warrants                
Temporary Equity [Line Items]                
Stock issuance costs | $ $ 439              
Proceeds from transaction | $ $ 15,559              
Legacy ESS                
Temporary Equity [Line Items]                
Warrants issued (in shares)       22,021,284        
Warrants exercised (in shares)       24,581,852        
Transaction value | $     $ 34,613          
Warrants (in shares)       0 2,560,568      
Warrants term   10 years            
Legacy ESS | Series C-2 Redeemable Convertible Preferred Stock Purchase Rights                
Temporary Equity [Line Items]                
Fair value of temporary equity | $         $ 11,379      
Warrants issued (in shares)     861,896          
Warrants exercised (in shares)     5,746,003 13,740,421        
Warrant exercise price (in USD per share) | $ / shares     $ 0.0001          
Warrants (in shares)       0 39,971,716      
Legacy ESS | Series C-2 Redeemable Convertible Preferred Stock Warrants                
Temporary Equity [Line Items]                
Warrants issued (in shares)       22,021,284        
Warrants exercised (in shares)       22,021,284        
Warrant exercise price (in USD per share) | $ / shares           $ 0.00007    
Warrants (in shares)         0      
Warrants term   10 years            
Legacy ESS | Series C-2 Redeemable Convertible Preferred Stock Warrants | Minimum                
Temporary Equity [Line Items]                
Warrant exercise price (in USD per share) | $ / shares   $ 0.00007            
Legacy ESS | Series C-2 Redeemable Convertible Preferred Stock Warrants | Maximum                
Temporary Equity [Line Items]                
Warrant exercise price (in USD per share) | $ / shares   $ 1.25            
Legacy ESS | Series B Preferred Warrants                
Temporary Equity [Line Items]                
Warrants issued (in shares)       0        
Warrants exercised (in shares)       2,007,308        
Warrants (in shares)   100,161   0 2,007,308      
Legacy ESS | Series B Preferred Warrants | Minimum                
Temporary Equity [Line Items]                
Warrant exercise price (in USD per share) | $ / shares   $ 0.0007            
Legacy ESS | Series B Preferred Warrants | Maximum                
Temporary Equity [Line Items]                
Warrant exercise price (in USD per share) | $ / shares   $ 0.83            
Legacy ESS | Series C-1 Preferred Warrants                
Temporary Equity [Line Items]                
Warrants issued (in shares)       0        
Warrants exercised (in shares)       103,107        
Warrants (in shares)       0 103,107      
Warrants term   10 years            
Legacy ESS | Series C-1 Preferred Warrants | Minimum                
Temporary Equity [Line Items]                
Warrant exercise price (in USD per share) | $ / shares   $ 0.00007            
Legacy ESS | Series C-1 Preferred Warrants | Maximum                
Temporary Equity [Line Items]                
Warrant exercise price (in USD per share) | $ / shares   1.25            
Legacy ESS | Common Stock Warrants                
Temporary Equity [Line Items]                
Warrants issued (in shares)       0        
Warrants exercised (in shares)       450,153        
Warrant exercise price (in USD per share) | $ / shares   $ 0.0007            
Warrants (in shares)       0 450,153      
Common Stock                
Temporary Equity [Line Items]                
Conversion of convertible shares (in shares)   57,104,332            
Price per share (in USD per share) | $ / shares $ 11.50              
Series C-2 Redeemable Convertible Preferred Stock | Legacy ESS                
Temporary Equity [Line Items]                
Committed funding amount | $         $ 79,999      
Committed purchase of shares (in shares)         39,971,716      
Committed price per share (in USD per share) | $ / shares         $ 2.00      
Shares issued (in shares)     5,746,003          
Price per share (in USD per share) | $ / shares     $ 2.00          
Value of share issued | $     $ 11,500          
Stock issuance costs | $     39          
Derivative liabilities | $     23,152          
Transaction value | $     29,516          
Warrants | Legacy ESS                
Temporary Equity [Line Items]                
Transaction value | $     $ 5,096