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Finance Income (Expense), Net - Schedule of Finance Income (Expense), Net (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
FINANCE EXPENSE, NET [Abstract] |  |  |
Interest income |  | $ 1 | $ 1
Interest expense | [1] | (232) | (604)
Exchange gain, net |  |  | 31
Finance income (expense), net |  | $ (231) | $ (572)
[1] | Interest expense includes $446 associated with the LT Loan in 2016 (see Note 5) and $123 and $56 with respect to Loans from Directors in the years ended December 31, 2017 and 2016, respectively (see Notes 6 and 18)

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- Definition Finace Income Expense Exchange Gain Loss Net. + References No definition available. + Details
Name: | ACFN_FinaceIncomeExpenseExchangeGainLossNet
Namespace Prefix: | ACFN_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition FINANCE EXPENSE, NET [Abstract] + References No definition available. + Details
Name: | ACFN_FinanceExpenseNetAbstract
Namespace Prefix: | ACFN_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of net finance expense or income derived from nonoperating financing activities of the entity. + References No definition available. + Details
Name: | ACFN_FinanceIncomeExpenseNet
Namespace Prefix: | ACFN_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Finance Interest Income. + References No definition available. + Details
Name: | ACFN_FinanceInterestIncome
Namespace Prefix: | ACFN_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This element represents interest incurred for borrowed money which was used to produce goods or render services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_FinancingInterestExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration