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Goodwill and Intangible Assets - Changes in Carrying Amounts of Goodwill by Segment (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Goodwill, Ending balance | $ 1,031 us-gaap_Goodwill |  | $ 3,027 us-gaap_Goodwill |
Goodwill and Intangible Assets [Member] |  |  |  |
Goodwill, Beginning balance | 3,027 us-gaap_Goodwill / us-gaap_FairValueByAssetClassAxis = ACFN_GoodwillAndIntangibleAssetsMember |  | 5,228 us-gaap_Goodwill / us-gaap_FairValueByAssetClassAxis = ACFN_GoodwillAndIntangibleAssetsMember |
Impairment | (1,773)us-gaap_GoodwillImpairmentLoss / us-gaap_FairValueByAssetClassAxis = ACFN_GoodwillAndIntangibleAssetsMember |  | (1,930)us-gaap_GoodwillImpairmentLoss / us-gaap_FairValueByAssetClassAxis = ACFN_GoodwillAndIntangibleAssetsMember |
Translation Adjustments | (223)us-gaap_GoodwillTranslationAdjustments / us-gaap_FairValueByAssetClassAxis = ACFN_GoodwillAndIntangibleAssetsMember |  | (271)us-gaap_GoodwillTranslationAdjustments / us-gaap_FairValueByAssetClassAxis = ACFN_GoodwillAndIntangibleAssetsMember |
Goodwill, Ending balance | 1,031 us-gaap_Goodwill / us-gaap_FairValueByAssetClassAxis = ACFN_GoodwillAndIntangibleAssetsMember |  | 3,027 us-gaap_Goodwill / us-gaap_FairValueByAssetClassAxis = ACFN_GoodwillAndIntangibleAssetsMember |
Energy & Security Sonar Solutions Segment [Member] |  |  |  |
Goodwill, Beginning balance | 581 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember |  | 541 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember |
Impairment |  |  |  |
Translation Adjustments | (63)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember |  | 40 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember |
Goodwill, Ending balance | 518 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember |  | 581 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember |
GridSense segment [Member] |  |  |  |
Goodwill, Beginning balance | 2,446 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember |  | 2,757 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember |
Impairment | (1,773)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember |  |  |
Translation Adjustments | (160)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember |  | (311)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember |
Goodwill, Ending balance | 513 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember |  | 2,446 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember |
M2M Segment [Member] |  |  |  |
Goodwill, Beginning balance |  |  | 1,517 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_MTwoMSegmentMember |
Impairment |  |  | (1,517)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = ACFN_MTwoMSegmentMember |
Translation Adjustments |  |  |  |
Goodwill, Ending balance |  |  |  |
PM [Member] |  |  |  |
Goodwill, Beginning balance |  | [1] | 413 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_PipelineMonitoringMember | [1]
Impairment |  | [1] | (413)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = ACFN_PipelineMonitoringMember | [1]
Translation Adjustments |  | [1] |  | [1]
Goodwill, Ending balance |  | [1] |  | [1]
[1] | Results for the Pipeline Monitoring ("PM") segment are included in "Other" in Segment Reporting (see Note 18).

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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