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Segment Reporting - Summary of Segmented Data (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Revenue from external customers	$ 4,618us-gaap_Revenues	$ 4,454us-gaap_Revenues
Intersegment revenues
Segment gross profit	1,519us-gaap_GrossProfit	1,430us-gaap_GrossProfit
Depreciation and amortization	131ACFN_SegmentDepreciationAndAmortization	167ACFN_SegmentDepreciationAndAmortization
Segment net income (loss) before income taxes	(792)ACFN_SegmentNetIncomeLossBeforeIncomeTaxes	(1,605)ACFN_SegmentNetIncomeLossBeforeIncomeTaxes
Energy & Security Sonar Solutions [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	2,660us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember	2,515us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember
Intersegment revenues
Segment gross profit	605us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember	686us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember
Depreciation and amortization	45ACFN_SegmentDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember	71ACFN_SegmentDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember
Segment net income (loss) before income taxes	(294)ACFN_SegmentNetIncomeLossBeforeIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember	(208)ACFN_SegmentNetIncomeLossBeforeIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember
GridSense [Member]
Segment Reporting Information [Line Items]
Revenue from external customers			908us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember	963us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember
Intersegment revenues
Segment gross profit			277us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember	185us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember
Depreciation and amortization			57ACFN_SegmentDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember	65ACFN_SegmentDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember
Segment net income (loss) before income taxes			(325)ACFN_SegmentNetIncomeLossBeforeIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember	(973)ACFN_SegmentNetIncomeLossBeforeIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember
M2M [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	553us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ACFN_MachineToMachineMember	508us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ACFN_MachineToMachineMember
Intersegment revenues
Segment gross profit	340us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = ACFN_MachineToMachineMember	312us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = ACFN_MachineToMachineMember
Depreciation and amortization	18ACFN_SegmentDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = ACFN_MachineToMachineMember	17ACFN_SegmentDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = ACFN_MachineToMachineMember
Segment net income (loss) before income taxes	(278)ACFN_SegmentNetIncomeLossBeforeIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = ACFN_MachineToMachineMember	(403)ACFN_SegmentNetIncomeLossBeforeIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = ACFN_MachineToMachineMember
Other [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	497us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	468us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Intersegment revenues
Segment gross profit	297us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	247us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Depreciation and amortization	11ACFN_SegmentDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	14ACFN_SegmentDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Segment net income (loss) before income taxes	$ 105ACFN_SegmentNetIncomeLossBeforeIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	$ (21)ACFN_SegmentNetIncomeLossBeforeIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember

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- Definition

Intersegment revenues.

+ References

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- Definition

Segment depreciation and amortization

+ References

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- Definition

Segment net income (loss) before income taxes

+ References

No definition available.

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- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ 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 210.5-03.1,2)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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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)

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