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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
Dec. 31, 2014
Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]    
Current severance liability $ 200ACFN_SeveranceLiabilityCurrent $ 151ACFN_SeveranceLiabilityCurrent
Non-current severance liability 4,594ACFN_SeveranceLiabilityNonCurrent 4,973ACFN_SeveranceLiabilityNonCurrent
Total severance liability 4,794ACFN_SeveranceLiability 5,124ACFN_SeveranceLiability
Amount of the total severance liability with respect to employees reaching legal retirement age in Israel in the next 10 years 1,588ACFN_SeveranceLiabilityPayableInNextTenYears 2,071ACFN_SeveranceLiabilityPayableInNextTenYears
Current severance assets 203ACFN_SeveranceAssetsCurrent 137ACFN_SeveranceAssetsCurrent
Non-current severance assets 3,256ACFN_SeveranceAssetsnoncurrent 3,539ACFN_SeveranceAssetsnoncurrent
Total severance assets 3,459ACFN_SeveranceAssets 3,676ACFN_SeveranceAssets
Amount of the total severance assets with respect to employees reaching legal retirement age in Israel in the next 10 years $ 1,156ACFN_AssetsInRespectOfEmployeesReachingRetirementInNextTenYears $ 1,265ACFN_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