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Finance Expense, Net - Schedule of Finance Income (Expense), Net (Details) (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
OmniMetrix Loan and Security Agreement [Member] |  |
Interest expense related to loan | $ 84 | $ 31
Loans from Directors [Member] |  |
Interest expense related to loan | $ 6 | $ 123

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- Definition Interest expense related to LT loan. + References No definition available. + Details
Name: | ACFN_InterestExpenseRelatedToLtLoan
Namespace Prefix: | ACFN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_TypeOfArrangementAxis=ACFN_OmniMetrixLoanAndSecurityAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_TitleOfIndividualAxis=ACFN_LoansFromDirectorsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |