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Segment Reporting and Geographic Information - Summary of Segmented Data (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
Segment Reporting Information [Line Items] |  |  |  |
Revenue from External Customers | $ 19,560 us-gaap_Revenues | $ 20,288 us-gaap_Revenues |  |
Intersegment revenues |  |  |  |
Segment gross profit | 6,638 ACFN_SegmentGrossProfit | 7,503 ACFN_SegmentGrossProfit |  |
Impairment of goodwill and intangibles | 1,773 us-gaap_GoodwillAndIntangibleAssetImpairment | 6,731 us-gaap_GoodwillAndIntangibleAssetImpairment |  |
Restructuring and related charges | 294 us-gaap_RestructuringAndRelatedCostIncurredCost | 594 us-gaap_RestructuringAndRelatedCostIncurredCost |  |
Depreciation and amortization | 646 ACFN_SegmentDepreciationAndAmortization | 1,053 ACFN_SegmentDepreciationAndAmortization |  |
Segment net income (loss) before income taxes | (6,844)ACFN_SegmentNetIncomeLossBeforeIncomeTaxes | (16,117)ACFN_SegmentNetIncomeLossBeforeIncomeTaxes |  |
Segment assets | 18,258 us-gaap_NoncurrentAssets | 20,789 us-gaap_NoncurrentAssets | 18,258 us-gaap_NoncurrentAssets | 20,789 us-gaap_NoncurrentAssets
Expenditures for segment assets | 393 us-gaap_PaymentsToAcquireProductiveAssets | 1,468 us-gaap_PaymentsToAcquireProductiveAssets |  |
Energy & Security Sonar Solutions Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from External Customers | 11,200 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember | 11,815 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember |  |
Intersegment revenues |  |  |  |
Segment gross profit | 3,272 ACFN_SegmentGrossProfit / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember | 3,817 ACFN_SegmentGrossProfit / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember |  |
Impairment of goodwill and intangibles |  |  |  |
Restructuring and related charges |  |  |  |
Depreciation and amortization | 287 ACFN_SegmentDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember | 247 ACFN_SegmentDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember |  |
Segment net income (loss) before income taxes | (414)ACFN_SegmentNetIncomeLossBeforeIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember | (243)ACFN_SegmentNetIncomeLossBeforeIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember |  |
Segment assets | 12,118 us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember | 11,219 us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember | 12,118 us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember | 11,219 us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember
Expenditures for segment assets | 278 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember | 333 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember |  |
GridSense segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from External Customers |  |  | 4,493 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember | 5,026 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember
Intersegment revenues |  |  |  |
Segment gross profit |  |  | 1,297 ACFN_SegmentGrossProfit / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember | 1,828 ACFN_SegmentGrossProfit / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember
Impairment of goodwill and intangibles |  |  | 1,773 us-gaap_GoodwillAndIntangibleAssetImpairment / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember |
Restructuring and related charges |  |  | 198 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember | 594 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember
Depreciation and amortization |  |  | 242 ACFN_SegmentDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember | 342 ACFN_SegmentDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember
Segment net income (loss) before income taxes |  |  | (4,831)ACFN_SegmentNetIncomeLossBeforeIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember | (4,336)ACFN_SegmentNetIncomeLossBeforeIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember
Segment assets | 3,680 us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember | 6,400 us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember | 3,680 us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember | 6,400 us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember
Expenditures for segment assets |  |  | 6 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember | 14 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember
M2M [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from External Customers | 2,174 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ACFN_MachineToMachineMember | 1,671 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ACFN_MachineToMachineMember |  |
Intersegment revenues |  |  |  |
Segment gross profit | 1,182 ACFN_SegmentGrossProfit / us-gaap_StatementBusinessSegmentsAxis = ACFN_MachineToMachineMember | 867 ACFN_SegmentGrossProfit / us-gaap_StatementBusinessSegmentsAxis = ACFN_MachineToMachineMember |  |
Impairment of goodwill and intangibles |  | 5,341 us-gaap_GoodwillAndIntangibleAssetImpairment / us-gaap_StatementBusinessSegmentsAxis = ACFN_MachineToMachineMember |  |
Restructuring and related charges | 76 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_StatementBusinessSegmentsAxis = ACFN_MachineToMachineMember |  |  |
Depreciation and amortization | 69 ACFN_SegmentDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = ACFN_MachineToMachineMember | 336 ACFN_SegmentDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = ACFN_MachineToMachineMember |  |
Segment net income (loss) before income taxes | (1,698)ACFN_SegmentNetIncomeLossBeforeIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = ACFN_MachineToMachineMember | (9,492)ACFN_SegmentNetIncomeLossBeforeIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = ACFN_MachineToMachineMember |  |
Segment assets | 1,663 us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = ACFN_MachineToMachineMember | 2,300 us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = ACFN_MachineToMachineMember | 1,663 us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = ACFN_MachineToMachineMember | 2,300 us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = ACFN_MachineToMachineMember
Expenditures for segment assets |  | 750 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = ACFN_MachineToMachineMember |  |
Other Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from External Customers | 1,693 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 1,776 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |
Intersegment revenues |  |  |  |
Segment gross profit | 888 ACFN_SegmentGrossProfit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 991 ACFN_SegmentGrossProfit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |
Impairment of goodwill and intangibles |  | 1,390 us-gaap_GoodwillAndIntangibleAssetImpairment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |
Restructuring and related charges | 20 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |
Depreciation and amortization | 48 ACFN_SegmentDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 128 ACFN_SegmentDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |
Segment net income (loss) before income taxes | 99 ACFN_SegmentNetIncomeLossBeforeIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (2,046)ACFN_SegmentNetIncomeLossBeforeIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |
Segment assets | 797 us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 870 us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 797 us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 870 us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Expenditures for segment assets | $ 44 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | $ 295 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |

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