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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 | Previously Reported | Previously Reported Common Stock | Previously Reported Common Stock Warrants | Previously Reported Additional Paid-In Capital | Previously Reported Accumulated Deficit | Retroactive application of recapitalization | Retroactive application of recapitalization Common Stock | Retroactive application of recapitalization Common Stock Warrants | Retroactive application of recapitalization Additional Paid-In Capital | Retroactive application of recapitalization Accumulated Deficit
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Balance at beginning of period (in shares) at Dec. 31, 2019 | 0 |  |  |  |  |  |  |  |  |  |  |  | 32,865,949 |  |  |  |  | (32,865,949) |  |  |  |
Balance at beginning of period at Dec. 31, 2019 | $ 0 |  |  |  |  |  |  |  |  |  |  |  | $ 34,372 |  |  |  |  | $ (34,372) |  |  |  |
Balance at end of period (in shares) at Dec. 31, 2020 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of period at Dec. 31, 2020 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period (in shares) at Dec. 31, 2019 |  |  |  | 58,810,346,000 |  |  |  |  |  |  |  |  |  | 7,060,668,000 |  |  |  |  | 51,749,678,000 |  |  |
Balance at beginning of period at Dec. 31, 2019 | $ 2,214 |  |  | $ 6 |  |  | $ 153 |  | $ 35,129 |  |  | $ (33,074) | $ (32,158) | $ 1 | $ 153 | $ 762 | $ (33,074) | $ 34,372 | $ 5 | $ 0 | $ 34,367 | $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock upon exercise of options (in shares) | 108,999 |  |  | 108,999,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock upon exercise of options | $ 7 |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 310 |  |  |  |  |  |  |  | 310 |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | (30,419) |  |  |  |  |  |  |  |  |  |  | (30,419) |  |  |  |  |  |  |  |  |  |
Balance at end of period (in shares) at Dec. 31, 2020 |  |  |  | 58,919,345,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of period at Dec. 31, 2020 | $ (27,888) |  |  | $ 6 |  |  | 153 |  | 35,446 |  |  | (63,493) |  |  |  |  |  |  |  |  |  |
Balance at end of period (in shares) at Dec. 31, 2021 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of period at Dec. 31, 2021 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock upon exercise of options (in shares) | 2,496,070 |  |  | 13,112,000 | 2,482,958,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock upon exercise of options | $ 7 | $ 664 |  |  |  |  |  |  | 7 | $ 664 |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  | 5,746,003,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of share issued | 29,516 |  |  | $ 1 |  |  |  |  | 29,515 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock upon exercise of warrants (in shares) |  |  |  | 955,374,000 | 3,398,214,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of 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) |  |  |  |  |  | 29,153,806,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Legacy ESS Series C-2 Redeemable Convertible Preferred Stock upon exercise of C-2 Purchase Right and warrant |  |  | $ 238,483 |  |  | $ 3 |  |  |  |  | $ 238,480 |  |  |  |  |  |  |  |  |  |  |
Net business Combination and PIPE Financing (in shares) |  |  |  | 35,495,281,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Business Combination and PIPE Financing | 128,917 |  |  | $ 4 |  |  |  |  | 128,913 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock upon achievement of earnout (in shares) |  |  |  | 15,674,965,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  | 151,839,058,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of period at Dec. 31, 2021 | $ 205,159 |  |  | $ 16 |  |  | $ 0 |  | $ 745,753 |  |  | $ (540,610) |  |  |  |  |  |  |  |  |  |

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