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Accrued Severance, Severance Assets and Retirement Plans - Breakdown of Company's Severance Liability and Severance Assets (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract] |  |
Current severance liability | $ 200 ACFN_SeveranceLiabilityCurrent | $ 151 ACFN_SeveranceLiabilityCurrent
Non-current severance liability | 4,594 ACFN_SeveranceLiabilityNonCurrent | 4,973 ACFN_SeveranceLiabilityNonCurrent
Total severance liability | 4,794 ACFN_SeveranceLiability | 5,124 ACFN_SeveranceLiability
Amount of the total severance liability with respect to employees reaching legal retirement age in Israel in the next 10 years | 1,588 ACFN_SeveranceLiabilityPayableInNextTenYears | 2,071 ACFN_SeveranceLiabilityPayableInNextTenYears
Current severance assets | 203 ACFN_SeveranceAssetsCurrent | 137 ACFN_SeveranceAssetsCurrent
Non-current severance assets | 3,256 ACFN_SeveranceAssetsnoncurrent | 3,539 ACFN_SeveranceAssetsnoncurrent
Total severance assets | 3,459 ACFN_SeveranceAssets | 3,676 ACFN_SeveranceAssets
Amount of the total severance assets with respect to employees reaching legal retirement age in Israel in the next 10 years | $ 1,156 ACFN_AssetsInRespectOfEmployeesReachingRetirementInNextTenYears | $ 1,265 ACFN_AssetsInRespectOfEmployeesReachingRetirementInNextTenYears
Severance liability with respect to employees reaching legal retirement | 10 years | 10 years
Severance assets with respect to employees reaching legal retirement age | 10 years | 10 years

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- Definition Assets in Respect of Employees Reaching Retirement in Next Ten Years. + References No definition available. + Details
Name: | ACFN_AssetsInRespectOfEmployeesReachingRetirementInNextTenYears
Namespace Prefix: | ACFN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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 Assets With Respect To Employees Reaching Legal Retirement Age. + References No definition available. + Details
Name: | ACFN_SeveranceAssetsWithRespectToEmployeesReachingLegalRetirementAge
Namespace Prefix: | ACFN_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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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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- Definition Severance Liability Payable in Next Ten Years. + References No definition available. + Details
Name: | ACFN_SeveranceLiabilityPayableInNextTenYears
Namespace Prefix: | ACFN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Severance Liability With Respect To Employees Reaching Legal Retirement. + References No definition available. + Details
Name: | ACFN_SeveranceLiabilityWithRespectToEmployeesReachingLegalRetirement
Namespace Prefix: | ACFN_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration