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Consolidated Statements of Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Total
Legacy ESS Common Stock
Series C-2 Redeemable Convertible Preferred Stock
Common Stock
Common Stock
Legacy ESS Common Stock
Common Stock
Series C-2 Redeemable Convertible Preferred Stock
Common Stock Warrants
Common Stock Warrants
Legacy ESS Common Stock
Additional Paid-In Capital
Additional Paid-In Capital
Legacy ESS Common Stock
Additional Paid-In Capital
Series C-2 Redeemable Convertible Preferred Stock
Accumulated Deficit
Balance at beginning of period (in shares) at Dec. 31, 2020 0                      
Balance at beginning of period at Dec. 31, 2020 $ 0                      
Balance at end of period (in shares) at Dec. 31, 2021 0                      
Balance at end of period at Dec. 31, 2021 $ 0                      
Balance at beginning of period (in shares) at Dec. 31, 2020       58,919,345                
Balance at beginning of period at Dec. 31, 2020 (27,888)     $ 6     $ 153   $ 35,446     $ (63,493)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Shares issued (in shares)       5,746,003                
Issuance of Legacy ESS Redeemable Convertible Preferred Stock $ 29,516     $ 1         29,515      
Issuance of common stock upon exercise of options (in shares) 2,496,070     13,112 2,482,958              
Issuance of common stock upon exercise of options $ 7 $ 664             7 $ 664    
Issuance of common stock upon exercise of warrants (in shares)       955,374 3,398,214              
Issuance of Legacy ESS common stock upon exercise of warrants 15,130 $ 26,185           $ (153) 15,130 $ 26,338    
Issuance of Legacy ESS Series C-2 Redeemable Convertible Preferred Stock upon exercise of C-2 Purchase Right and warrant (in shares)           29,153,806            
Issuance of Legacy ESS Series C-2 Redeemable Convertible Preferred Stock upon exercise of the Series C-2 Redeemable Convertible Preferred Stock Issuance Right and Series C-2 warrant     $ 238,483     $ 3         $ 238,480  
Net business Combination and PIPE Financing (in shares)       35,495,281                
Net Business Combination and PIPE Financing 128,917     $ 4         128,913      
Issuance of common stock upon achievement of earnout (in shares)       15,674,965                
Issuance of common stock upon achievement of earnout 263,340     $ 2         263,338      
Stock-based compensation expense 7,922               7,922      
Net loss $ (477,117)                     (477,117)
Balance at end of period (in shares) at Dec. 31, 2021 151,839,058     151,839,058                
Balance at end of period at Dec. 31, 2021 $ 205,159     $ 16     0   745,753     (540,610)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Shares issued (in shares) 25,000,000                      
Net business Combination and PIPE Financing (in shares) 64,649,087                      
Balance at end of period (in shares) at Oct. 08, 2021 135,195,607                      
Balance at end of period (in shares) at Dec. 31, 2022 0                      
Balance at end of period at Dec. 31, 2022 $ 0                      
Balance at beginning of period (in shares) at Dec. 31, 2021 151,839,058     151,839,058                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Issuance of common stock upon exercise of options (in shares) 529,832                      
Issuance of common stock upon exercise of warrants (in shares)       20                
Stock-based compensation expense $ 11,889               11,889      
Issuance of common stock under employee stock plans (in shares)       2,226,463                
Issuance of common stock under employee stock plans 657               657      
Cancellation of shares used to settle payroll tax withholding (in shares)       (244,202)                
Cancellation of shares used to settle payroll tax withholding (2,808)               (2,808)      
Warrants issued 46               46      
Net loss $ (77,969)                     (77,969)
Balance at end of period (in shares) at Dec. 31, 2022 153,821,339     153,821,339                
Balance at end of period at Dec. 31, 2022 $ 136,974     $ 16     $ 0   $ 755,537     $ (618,579)