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Consolidated Statements of Changes in (Deficit)/Equity - USD ($) $ in Thousands | Common Stock [Member] | Additional Paid-In Capital [Member] | Warrants [Member] | Accumulated Deficit [Member] | Treasury Stock [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Total Acorn Energy, Inc. Shareholders' Equity (Deficit) / Equity [Member] | Non-Controlling Interests [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balances at Dec. 31, 2016 | $ 301 | $ 99,767 | $ 1,600 | $ (97,046) | $ (3,036) | $ (254) | $ 1,332 | $ 555 | $ 1,887
Balances, shares at Dec. 31, 2016 | 30,125,000 |  |  |  |  |  |  |  |
Net loss |  |  |  | (1,169) |  |  | (1,169) | (174) | (1,343)
Deconsolidation of GridSense (see Note 4) |  |  |  |  |  | 254 | 254 |  | 254
Shares issued in lieu of director fees (see Note 15 (a)) | $ 2 | 30 |  |  |  |  | 32 |  | 32
Shares issued in lieu of director fees, shares (see Note 15 (a)) | 177,000 |  |  |  |  |  |  |  |
Accrued dividend in OmniMetrix preferred shares |  |  |  |  |  |  |  | (100) | (100)
Stock option compensation |  | 22 |  |  |  |  | 22 |  | 22
Balances at Dec. 31, 2017 | $ 303 | 99,819 | 1,600 | (98,215) | (3,036) |  | 471 | 281 | 752
Balances, shares at Dec. 31, 2017 | 30,302,000 |  |  |  |  |  |  |  |
Net loss |  |  |  | (2,001) |  |  | (2,001) | (86) | (2,087)
Shares issued in lieu of director fees (see Note 15 (a)) | $ 1 | 13 |  |  |  |  | 14 |  | 14
Shares issued in lieu of director fees, shares (see Note 15 (a)) | 56,000 |  |  |  |  |  |  |  |
Accrued dividend in OmniMetrix preferred shares |  |  |  |  |  |  |  | (87) | (87)
Stock option compensation |  | 26 |  |  |  |  | 26 |  | 26
Adjustment of retained earnings in accordance with ASC 606 (see Note 17) |  |  |  | 152 |  |  | 152 |  | 152
Value of expired warrants |  | 482 | (482) |  |  |  |  |  |
Balances at Dec. 31, 2018 | $ 304 | $ 100,340 | $ 1,118 | $ (100,064) | $ (3,036) |  | $ (1,338) | $ 108 | $ (1,230)
Balances, shares at Dec. 31, 2018 | 30,358,000 |  |  |  |  |  |  |  |

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