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v3.20.4

Document and Entity Information - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Mar. 11, 2021 | Jun. 30, 2020
Cover [Abstract] |  |  |
Entity Registrant Name | ACORN ENERGY, INC. |  |
Entity Central Index Key | 0000880984 |  |
Document Type | 10-K |  |
Document Period End Date | Dec. 31, 2020 |  |
Amendment Flag | false |  |
Current Fiscal Year End Date | --12-31 |  |
Entity Well-known Seasoned Issuer | No |  |
Entity Voluntary Filer | No |  |
Entity Current Reporting Status | Yes |  |
Entity Interactive Data Current | Yes |  |
Entity Filer Category | Non-accelerated Filer |  |
Entity Small Business Flag | true |  |
Entity Emerging Growth Company | false |  |
Entity Shell Company | false |  |
Entity Public Float |  |  | $ 6,400
Entity Common Stock, Shares Outstanding |  | 39,687,589 |
Document Fiscal Period Focus | FY |  |
Document Fiscal Year Focus | 2020 |  |

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