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Goodwill and Intagible Assets - Changes in Carrying Amounts and Accumulated Amortization of Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Intangible assets, Beginning balance $ 1,550us-gaap_IntangibleAssetsNetExcludingGoodwill  
Amortization (282)us-gaap_AmortizationOfIntangibleAssets (699)us-gaap_AmortizationOfIntangibleAssets
Intangible assets, Ending balance 1,211us-gaap_IntangibleAssetsNetExcludingGoodwill 1,550us-gaap_IntangibleAssetsNetExcludingGoodwill
Goodwill and Intangible Assets [Member]    
Intangible assets, Beginning balance 1,550us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FairValueByAssetClassAxis
= ACFN_GoodwillAndIntangibleAssetsMember
7,226us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FairValueByAssetClassAxis
= ACFN_GoodwillAndIntangibleAssetsMember
Amortization (282)us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FairValueByAssetClassAxis
= ACFN_GoodwillAndIntangibleAssetsMember
(699)us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FairValueByAssetClassAxis
= ACFN_GoodwillAndIntangibleAssetsMember
Impairment    (4,801)us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FairValueByAssetClassAxis
= ACFN_GoodwillAndIntangibleAssetsMember
Sale of Bushing IQ (see Note 4(c))    (59)us-gaap_IndefiniteLivedIntangibleAssetsWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_FairValueByAssetClassAxis
= ACFN_GoodwillAndIntangibleAssetsMember
Cumulative translation adjustment (57)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments
/ us-gaap_FairValueByAssetClassAxis
= ACFN_GoodwillAndIntangibleAssetsMember
(117)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments
/ us-gaap_FairValueByAssetClassAxis
= ACFN_GoodwillAndIntangibleAssetsMember
Intangible assets, Ending balance 1,211us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FairValueByAssetClassAxis
= ACFN_GoodwillAndIntangibleAssetsMember
1,550us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FairValueByAssetClassAxis
= ACFN_GoodwillAndIntangibleAssetsMember
Energy & Security Sonar Solutions Segment [Member] | Accumulated Amortization [Member]    
Intangible assets, Beginning balance (482)us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_EnergySecuritySonarSolutionsSegmentMember
/ us-gaap_StatementEquityComponentsAxis
= ACFN_AccumulatedAmortizationMember
[1] (364)us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_EnergySecuritySonarSolutionsSegmentMember
/ us-gaap_StatementEquityComponentsAxis
= ACFN_AccumulatedAmortizationMember
[1]
Amortization (82)us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_EnergySecuritySonarSolutionsSegmentMember
/ us-gaap_StatementEquityComponentsAxis
= ACFN_AccumulatedAmortizationMember
[1] (82)us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_EnergySecuritySonarSolutionsSegmentMember
/ us-gaap_StatementEquityComponentsAxis
= ACFN_AccumulatedAmortizationMember
[1]
Impairment    [1]    [1]
Sale of Bushing IQ (see Note 4(c))    [1]    [1]
Cumulative translation adjustment 53us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_EnergySecuritySonarSolutionsSegmentMember
/ us-gaap_StatementEquityComponentsAxis
= ACFN_AccumulatedAmortizationMember
[1] (36)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_EnergySecuritySonarSolutionsSegmentMember
/ us-gaap_StatementEquityComponentsAxis
= ACFN_AccumulatedAmortizationMember
[1]
Intangible assets, Ending balance (511)us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_EnergySecuritySonarSolutionsSegmentMember
/ us-gaap_StatementEquityComponentsAxis
= ACFN_AccumulatedAmortizationMember
[1] (482)us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_EnergySecuritySonarSolutionsSegmentMember
/ us-gaap_StatementEquityComponentsAxis
= ACFN_AccumulatedAmortizationMember
[1]
Energy & Security Sonar Solutions Segment [Member] | Cost [Member]    
Intangible assets, Beginning balance 572us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_IncomeStatementLocationAxis
= ACFN_CostMember
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_EnergySecuritySonarSolutionsSegmentMember
532us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_IncomeStatementLocationAxis
= ACFN_CostMember
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_EnergySecuritySonarSolutionsSegmentMember
Amortization      
Impairment      
Sale of Bushing IQ (see Note 4(c))      
Cumulative translation adjustment (61)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments
/ us-gaap_IncomeStatementLocationAxis
= ACFN_CostMember
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_EnergySecuritySonarSolutionsSegmentMember
40us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments
/ us-gaap_IncomeStatementLocationAxis
= ACFN_CostMember
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_EnergySecuritySonarSolutionsSegmentMember
Intangible assets, Ending balance 511us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_IncomeStatementLocationAxis
= ACFN_CostMember
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_EnergySecuritySonarSolutionsSegmentMember
572us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_IncomeStatementLocationAxis
= ACFN_CostMember
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_EnergySecuritySonarSolutionsSegmentMember
GridSense segment [Member] | Accumulated Amortization [Member]    
Intangible assets, Beginning balance (811)us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_GridSenseSegmentMember
/ us-gaap_StatementEquityComponentsAxis
= ACFN_AccumulatedAmortizationMember
[1] (873)us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_GridSenseSegmentMember
/ us-gaap_StatementEquityComponentsAxis
= ACFN_AccumulatedAmortizationMember
[1]
Amortization (200)us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_GridSenseSegmentMember
/ us-gaap_StatementEquityComponentsAxis
= ACFN_AccumulatedAmortizationMember
[1] (264)us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_GridSenseSegmentMember
/ us-gaap_StatementEquityComponentsAxis
= ACFN_AccumulatedAmortizationMember
[1]
Impairment    [1]    [1]
Sale of Bushing IQ (see Note 4(c))    [1] 263us-gaap_IndefiniteLivedIntangibleAssetsWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_GridSenseSegmentMember
/ us-gaap_StatementEquityComponentsAxis
= ACFN_AccumulatedAmortizationMember
[1]
Cumulative translation adjustment 47us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_GridSenseSegmentMember
/ us-gaap_StatementEquityComponentsAxis
= ACFN_AccumulatedAmortizationMember
[1] 63us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_GridSenseSegmentMember
/ us-gaap_StatementEquityComponentsAxis
= ACFN_AccumulatedAmortizationMember
[1]
Intangible assets, Ending balance (964)us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_GridSenseSegmentMember
/ us-gaap_StatementEquityComponentsAxis
= ACFN_AccumulatedAmortizationMember
[1] (811)us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_GridSenseSegmentMember
/ us-gaap_StatementEquityComponentsAxis
= ACFN_AccumulatedAmortizationMember
[1]
Weighted average estimated useful lives in years 11 years 1 month 6 days  
GridSense segment [Member] | Cost [Member]    
Intangible assets, Beginning balance 2,271us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_IncomeStatementLocationAxis
= ACFN_CostMember
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_GridSenseSegmentMember
2,777us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_IncomeStatementLocationAxis
= ACFN_CostMember
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_GridSenseSegmentMember
Amortization      
Impairment      
Sale of Bushing IQ (see Note 4(c))    (322)us-gaap_IndefiniteLivedIntangibleAssetsWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_IncomeStatementLocationAxis
= ACFN_CostMember
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_GridSenseSegmentMember
Cumulative translation adjustment (96)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments
/ us-gaap_IncomeStatementLocationAxis
= ACFN_CostMember
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_GridSenseSegmentMember
(184)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments
/ us-gaap_IncomeStatementLocationAxis
= ACFN_CostMember
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_GridSenseSegmentMember
Intangible assets, Ending balance 2,175us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_IncomeStatementLocationAxis
= ACFN_CostMember
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_GridSenseSegmentMember
2,271us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_IncomeStatementLocationAxis
= ACFN_CostMember
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_GridSenseSegmentMember
Weighted average estimated useful lives in years 11 years 1 month 6 days  
M2M Segment [Member] | Accumulated Amortization [Member]    
Intangible assets, Beginning balance    [1] (309)us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_MTwoMSegmentMember
/ us-gaap_StatementEquityComponentsAxis
= ACFN_AccumulatedAmortizationMember
[1]
Amortization    [1] (252)us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_MTwoMSegmentMember
/ us-gaap_StatementEquityComponentsAxis
= ACFN_AccumulatedAmortizationMember
[1]
Impairment    [1] 561us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_MTwoMSegmentMember
/ us-gaap_StatementEquityComponentsAxis
= ACFN_AccumulatedAmortizationMember
[1]
Sale of Bushing IQ (see Note 4(c))    [1]    [1]
Cumulative translation adjustment    [1]    [1]
Intangible assets, Ending balance    [1]    [1]
M2M Segment [Member] | Cost [Member]    
Intangible assets, Beginning balance    4,385us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_IncomeStatementLocationAxis
= ACFN_CostMember
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_MTwoMSegmentMember
Amortization      
Impairment    (4,385)us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_IncomeStatementLocationAxis
= ACFN_CostMember
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_MTwoMSegmentMember
Sale of Bushing IQ (see Note 4(c))      
Cumulative translation adjustment      
Intangible assets, Ending balance      
PM [Member] | Accumulated Amortization [Member]    
Intangible assets, Beginning balance    [1],[2] (118)us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_PipelineMonitoringMember
/ us-gaap_StatementEquityComponentsAxis
= ACFN_AccumulatedAmortizationMember
[1],[2]
Amortization    [1],[2] (101)us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_PipelineMonitoringMember
/ us-gaap_StatementEquityComponentsAxis
= ACFN_AccumulatedAmortizationMember
[1],[2]
Impairment    [1],[2] 219us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_PipelineMonitoringMember
/ us-gaap_StatementEquityComponentsAxis
= ACFN_AccumulatedAmortizationMember
[1],[2]
Sale of Bushing IQ (see Note 4(c))    [1],[2]    [1],[2]
Cumulative translation adjustment    [1],[2]    [1],[2]
Intangible assets, Ending balance    [1],[2]    [1],[2]
PM [Member] | Cost [Member]    
Intangible assets, Beginning balance    [2] 1,196us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_IncomeStatementLocationAxis
= ACFN_CostMember
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_PipelineMonitoringMember
[2]
Amortization    [2]    [2]
Impairment    [2] (1,196)us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_IncomeStatementLocationAxis
= ACFN_CostMember
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_PipelineMonitoringMember
[2]
Sale of Bushing IQ (see Note 4(c))    [2]    [2]
Cumulative translation adjustment    [2]    [2]
Intangible assets, Ending balance    [2]    [2]
[1] Accumulated amortization
[2] Results for the PM segment are included in "Other" in Segment Reporting (see Note 18).