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Consolidated Statements of Changes in Deficit - USD ($) $ in Thousands | Common Stock [Member] | Additional Paid-In Capital [Member] | Warrants [Member] | Accumulated Deficit [Member] | Treasury Stock [Member] | Total Acorn Energy, Inc. Shareholders' Deficit [Member] | Non-Controlling Interests [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balances at Dec. 31, 2018 | $ 296 |  | $ 100,348 | $ 1,118 | $ (100,064) | $ (3,036) | $ (1,338) | $ 108 | $ (1,230)
Balances, shares at Dec. 31, 2018 | 29,556,000 |  |  |  |  | 802,000 |  |  |
Net income (loss) |  |  |  |  | (618) |  | (618) | (29) | (647)
Purchase of non-controlling interest |  |  | (914) |  |  |  | (914) | (36) | (950)
Rights offering, proceeds net of expenses | $ 100 |  | 2,084 |  |  |  | 2,184 |  | 2,184
Rights offering, proceeds net of expenses, shares | 9,975,000 |  |  |  |  |  |  |  |
Shares issued in lieu of professional fees |  | [1] | 18 |  |  |  | 18 |  | $ 18
Shares issued in lieu of professional fees, shares | 60,000 |  |  |  |  |  |  |  |
Proceeds from stock option exercise, shares |  |  |  |  |  |  |  |  |
Accrued dividend in OmniMetrix preferred shares |  |  |  |  |  |  |  | (42) | $ (42)
Value of expired warrants |  |  | 97 | (97) |  |  |  |  |
Stock option compensation |  |  | 22 |  |  |  | 22 |  | 22
Balances at Dec. 31, 2019 | $ 396 |  | 101,655 | 1,021 | (100,682) | $ (3,036) | (646) | 1 | (645)
Balances, shares at Dec. 31, 2019 | 39,591,000 |  |  |  |  | 802,000 |  |  |
Net income (loss) |  |  |  |  | 69 |  | 69 | 7 | 76
Rights offering, proceeds net of expenses |  |  |  |  |  |  |  |  |
Proceeds from stock option exercise | $ 1 |  | 18 |  |  |  | 19 |  | $ 19
Proceeds from stock option exercise, shares | 96,000 |  |  |  |  |  |  |  | 96,250
Accrued dividend in OmniMetrix preferred shares |  |  |  |  |  |  |  | (4) | $ (4)
Value of expired warrants |  |  | 1,018 | (1,018) |  |  |  |  |
Stock option compensation |  |  | 35 |  |  |  | 35 |  | 35
Balances at Dec. 31, 2020 | $ 397 |  | $ 102,726 | $ 3 | $ (100,613) | $ (3,036) | $ (523) | $ 4 | $ (519)
Balances, shares at Dec. 31, 2020 | 39,687,000 |  |  |  |  | 802,000 |  |  |
[1] | * Less than $1

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