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Segment Reporting and Geographic Information - Revenues from Major Customers (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 19,560 us-gaap_Revenues | $ 20,288 us-gaap_Revenues |  |
Energy & Security Sonar Solutions Segment [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 11,200 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember | 11,815 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember |  |
Customer A [Member] | Energy & Security Sonar Solutions Segment [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 284 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ACFN_CustomerMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember | 2,336 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ACFN_CustomerMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember |  |
Percent of total revenues | 1.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_MajorCustomersAxis = ACFN_CustomerMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember | 12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_MajorCustomersAxis = ACFN_CustomerMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember |  |
Customer B [Member] | Energy & Security Sonar Solutions Segment [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 1,940 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ACFN_CustomerBMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember | 2,948 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ACFN_CustomerBMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember |  |
Percent of total revenues | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_MajorCustomersAxis = ACFN_CustomerBMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember | 15.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_MajorCustomersAxis = ACFN_CustomerBMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember |  |
Customer C [Member] | Energy & Security Sonar Solutions Segment [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 3,997 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ACFN_CustomerCMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember | 1,077 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ACFN_CustomerCMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember |  |
Percent of total revenues | 20.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_MajorCustomersAxis = ACFN_CustomerCMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember | 5.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_MajorCustomersAxis = ACFN_CustomerCMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember |  |
Customer D [Member] | Energy & Security Sonar Solutions Segment [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues |  |  | $ 1,848 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ACFN_CustomerDMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember | $ 992 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ACFN_CustomerDMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember
Percent of total revenues |  |  | 9.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_MajorCustomersAxis = ACFN_CustomerDMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember | 5.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_MajorCustomersAxis = ACFN_CustomerDMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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