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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	$ 1,031us-gaap_Goodwill		$ 3,027us-gaap_Goodwill
Goodwill and Intangible Assets [Member]
Goodwill, Beginning balance	3,027us-gaap_Goodwill / us-gaap_FairValueByAssetClassAxis = ACFN_GoodwillAndIntangibleAssetsMember		5,228us-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	1,031us-gaap_Goodwill / us-gaap_FairValueByAssetClassAxis = ACFN_GoodwillAndIntangibleAssetsMember		3,027us-gaap_Goodwill / us-gaap_FairValueByAssetClassAxis = ACFN_GoodwillAndIntangibleAssetsMember
Energy & Security Sonar Solutions Segment [Member]
Goodwill, Beginning balance	581us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember		541us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember
Impairment
Translation Adjustments	(63)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember		40us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember
Goodwill, Ending balance	518us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember		581us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember
GridSense segment [Member]
Goodwill, Beginning balance	2,446us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember		2,757us-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	513us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember		2,446us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember
M2M Segment [Member]
Goodwill, Beginning balance			1,517us-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]	413us-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).

X

- 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

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X

- Definition

Amount of loss from the write-down of an asset representing the 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

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+ References

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