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Accrued Severance, Severance Assets and Retirement Plans - Breakdown of Company's Severance Liability and Severance Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Compensation and Retirement Disclosure [Abstract] |  |
Current severance liability (included in Accrued payroll, payroll taxes and social benefits) | $ 279 | $ 41
Non-current severance liability |  | 4,984
Total severance liability | 279 | 5,025
Current severance assets (included in Other current assets) |  | 51
Non-current severance assets |  | 3,558
Total severance assets |  | $ 3,609

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- Definition Severance Assets. + References No definition available. + Details
Name: | ACFN_SeveranceAssets
Namespace Prefix: | ACFN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Severance Assets Current. + References No definition available. + Details
Name: | ACFN_SeveranceAssetsCurrent
Namespace Prefix: | ACFN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The carrying amount as of balance sheet date of severance assets in the form of regular deposits with recognized severance pay and pension funds and by the purchase of insurance policies. + References No definition available. + Details
Name: | ACFN_SeveranceAssetsNoncurrent
Namespace Prefix: | ACFN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Severance Liability. + References No definition available. + Details
Name: | ACFN_SeveranceLiability
Namespace Prefix: | ACFN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Severance Liability Current. + References No definition available. + Details
Name: | ACFN_SeveranceLiabilityCurrent
Namespace Prefix: | ACFN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Severance Liability Non Current. + References No definition available. + Details
Name: | ACFN_SeveranceLiabilityNonCurrent
Namespace Prefix: | ACFN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration