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Goodwill and Intagible Assets - Changes in Carrying Amounts and Accumulated Amortization of Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Intangible assets, Beginning balance	$ 1,211us-gaap_IntangibleAssetsNetExcludingGoodwill
Amortization	(47)us-gaap_AmortizationOfIntangibleAssets
Cumulative translation adjustment	(37)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments
Intangible assets, Ending balance	1,127us-gaap_IntangibleAssetsNetExcludingGoodwill
Energy & Security Sonar Solutions [Member] | Accumulated Amortization [Member]
Intangible assets, Beginning balance	(964)us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember
Amortization	(47)us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember
Cumulative translation adjustment	37us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember
Intangible assets, Ending balance	(974)us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember
Energy & Security Sonar Solutions [Member] | Cost [Member]
Intangible assets, Beginning balance	2,175us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_IncomeStatementLocationAxis = ACFN_CostMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember
Amortization
Cumulative translation adjustment	(74)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_IncomeStatementLocationAxis = ACFN_CostMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember
Intangible assets, Ending balance	$ 2,101us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_IncomeStatementLocationAxis = ACFN_CostMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of increase (decrease) of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit, from foreign currency translation and purchase accounting adjustments.

+ References

No definition available.

+ Details

Name:	us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph ((a)(1),(b))

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=ACFN_EnergySecuritySonarSolutionsSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: