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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Warrant [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Total Acorn Energy, Inc. Shareholders' Deficit [Member]
Noncontrolling Interest [Member]
Total
Beginning balance, value at Dec. 31, 2019 $ 396 $ 101,655 $ 1,021 $ (100,682) $ (3,036) $ (646) $ 1 $ (645)
Beginning balance, shares at Dec. 31, 2019 39,591       802      
Net loss (283) (283) (1) (284)
Accrued dividend in OmniMetrix preferred shares (1) (1)
Proceeds from stock option exercise $ 1 18 19 19
Proceeds from stock option exercise, shares 96              
Stock option compensation 6 6 6
Ending balance, value at Mar. 31, 2020 $ 397 101,679 1,021 (100,965) $ (3,036) (904) (1) (905)
Ending balance, shares at Mar. 31, 2020 39,687       802      
Beginning balance, value at Dec. 31, 2019 $ 396 101,655 1,021 (100,682) $ (3,036) (646) 1 (645)
Beginning balance, shares at Dec. 31, 2019 39,591       802      
Net loss               (347)
Ending balance, value at Sep. 30, 2020 $ 397 102,718 3 (101,030) $ (3,036) (948) (1) (949)
Ending balance, shares at Sep. 30, 2020 39,687       802      
Beginning balance, value at Mar. 31, 2020 $ 397 101,679 1,021 (100,965) $ (3,036) (904) (1) (905)
Beginning balance, shares at Mar. 31, 2020 39,687       802      
Net loss (33) (33) 1 (32)
Accrued dividend in OmniMetrix preferred shares (1) (1)
Value of expired warrants 1,018 (1,018)
Stock option compensation 13 13 13
Ending balance, value at Jun. 30, 2020 $ 397 102,710 3 (100,998) $ (3,036) (924) (1) (925)
Ending balance, shares at Jun. 30, 2020 39,687       802      
Net loss (32) (32) 1 (31)
Accrued dividend in OmniMetrix preferred shares (1) (1)
Stock option compensation 8 8 8
Ending balance, value at Sep. 30, 2020 $ 397 102,718 3 (101,030) $ (3,036) (948) (1) (949)
Ending balance, shares at Sep. 30, 2020 39,687       802      
Beginning balance, value at Dec. 31, 2020 $ 397 102,726 3 (100,613) $ (3,036) (523) 4 (519)
Beginning balance, shares at Dec. 31, 2020 39,687       802      
Net loss 20 20 2 22
Accrued dividend in OmniMetrix preferred shares (1) (1)
Proceeds from stock option exercise, shares 96              
Stock option compensation 15 15 15
Ending balance, value at Mar. 31, 2021 $ 397 102,741 3 (100,593) $ (3,036) (488) 5 (483)
Ending balance, shares at Mar. 31, 2021 39,687       802      
Beginning balance, value at Dec. 31, 2020 $ 397 102,726 3 (100,613) $ (3,036) (523) 4 (519)
Beginning balance, shares at Dec. 31, 2020 39,687       802      
Net loss               $ 51
Proceeds from stock option exercise, shares              
Ending balance, value at Sep. 30, 2021 $ 397 102,784 3 (100,568) $ (3,036) (420) 7 $ (413)
Ending balance, shares at Sep. 30, 2021 39,687       802      
Beginning balance, value at Mar. 31, 2021 $ 397 102,741 3 (100,593) $ (3,036) (488) 5 (483)
Beginning balance, shares at Mar. 31, 2021 39,687       802      
Net loss 2 2 2 4
Accrued dividend in OmniMetrix preferred shares (1) (1)
Stock option compensation 21 21 21
Ending balance, value at Jun. 30, 2021 $ 397 102,762 3 (100,591) $ (3,036) (465) 6 (459)
Ending balance, shares at Jun. 30, 2021 39,687       802      
Net loss 23 23 2 25
Accrued dividend in OmniMetrix preferred shares (1) (1)
Stock option compensation 22 22 22
Ending balance, value at Sep. 30, 2021 $ 397 $ 102,784 $ 3 $ (100,568) $ (3,036) $ (420) $ 7 $ (413)
Ending balance, shares at Sep. 30, 2021 39,687       802