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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 | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Intangible assets, Beginning balance | $ 1,550 us-gaap_IntangibleAssetsNetExcludingGoodwill |  |  |
Amortization | (282)us-gaap_AmortizationOfIntangibleAssets |  | (699)us-gaap_AmortizationOfIntangibleAssets |
Intangible assets, Ending balance | 1,211 us-gaap_IntangibleAssetsNetExcludingGoodwill |  | 1,550 us-gaap_IntangibleAssetsNetExcludingGoodwill |
Goodwill and Intangible Assets [Member] |  |  |  |
Intangible assets, Beginning balance | 1,550 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FairValueByAssetClassAxis = ACFN_GoodwillAndIntangibleAssetsMember |  | 7,226 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FairValueByAssetClassAxis = ACFN_GoodwillAndIntangibleAssetsMember |
Amortization | (282)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FairValueByAssetClassAxis = ACFN_GoodwillAndIntangibleAssetsMember |  | (699)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FairValueByAssetClassAxis = ACFN_GoodwillAndIntangibleAssetsMember |
Impairment |  |  | (4,801)us-gaap_ImpairmentOfIntangibleAssetsFinitelived / us-gaap_FairValueByAssetClassAxis = ACFN_GoodwillAndIntangibleAssetsMember |
Sale of Bushing IQ (see Note 4(c)) |  |  | (59)us-gaap_IndefiniteLivedIntangibleAssetsWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_FairValueByAssetClassAxis = ACFN_GoodwillAndIntangibleAssetsMember |
Cumulative translation adjustment | (57)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_FairValueByAssetClassAxis = ACFN_GoodwillAndIntangibleAssetsMember |  | (117)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_FairValueByAssetClassAxis = ACFN_GoodwillAndIntangibleAssetsMember |
Intangible assets, Ending balance | 1,211 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FairValueByAssetClassAxis = ACFN_GoodwillAndIntangibleAssetsMember |  | 1,550 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FairValueByAssetClassAxis = ACFN_GoodwillAndIntangibleAssetsMember |
Energy & Security Sonar Solutions Segment [Member] | Accumulated Amortization [Member] |  |  |  |
Intangible assets, Beginning balance | (482)us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember | [1] | (364)us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember | [1]
Amortization | (82)us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember | [1] | (82)us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember | [1]
Impairment |  | [1] |  | [1]
Sale of Bushing IQ (see Note 4(c)) |  | [1] |  | [1]
Cumulative translation adjustment | 53 us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember | [1] | (36)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember | [1]
Intangible assets, Ending balance | (511)us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember | [1] | (482)us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember | [1]
Energy & Security Sonar Solutions Segment [Member] | Cost [Member] |  |  |  |
Intangible assets, Beginning balance | 572 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_IncomeStatementLocationAxis = ACFN_CostMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember |  | 532 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_IncomeStatementLocationAxis = ACFN_CostMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember |
Amortization |  |  |  |
Impairment |  |  |  |
Sale of Bushing IQ (see Note 4(c)) |  |  |  |
Cumulative translation adjustment | (61)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_IncomeStatementLocationAxis = ACFN_CostMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember |  | 40 us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_IncomeStatementLocationAxis = ACFN_CostMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember |
Intangible assets, Ending balance | 511 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_IncomeStatementLocationAxis = ACFN_CostMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember |  | 572 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_IncomeStatementLocationAxis = ACFN_CostMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_EnergySecuritySonarSolutionsSegmentMember |
GridSense segment [Member] | Accumulated Amortization [Member] |  |  |  |
Intangible assets, Beginning balance | (811)us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember | [1] | (873)us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember | [1]
Amortization | (200)us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember | [1] | (264)us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember | [1]
Impairment |  | [1] |  | [1]
Sale of Bushing IQ (see Note 4(c)) |  | [1] | 263 us-gaap_IndefiniteLivedIntangibleAssetsWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember | [1]
Cumulative translation adjustment | 47 us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember | [1] | 63 us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember | [1]
Intangible assets, Ending balance | (964)us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember | [1] | (811)us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember | [1]
Weighted average estimated useful lives in years | 11 years 1 month 6 days |  |  |
GridSense segment [Member] | Cost [Member] |  |  |  |
Intangible assets, Beginning balance | 2,271 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_IncomeStatementLocationAxis = ACFN_CostMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember |  | 2,777 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_IncomeStatementLocationAxis = ACFN_CostMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember |
Amortization |  |  |  |
Impairment |  |  |  |
Sale of Bushing IQ (see Note 4(c)) |  |  | (322)us-gaap_IndefiniteLivedIntangibleAssetsWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_IncomeStatementLocationAxis = ACFN_CostMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember |
Cumulative translation adjustment | (96)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_IncomeStatementLocationAxis = ACFN_CostMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember |  | (184)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_IncomeStatementLocationAxis = ACFN_CostMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember |
Intangible assets, Ending balance | 2,175 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_IncomeStatementLocationAxis = ACFN_CostMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember |  | 2,271 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_IncomeStatementLocationAxis = ACFN_CostMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_GridSenseSegmentMember |
Weighted average estimated useful lives in years | 11 years 1 month 6 days |  |  |
M2M Segment [Member] | Accumulated Amortization [Member] |  |  |  |
Intangible assets, Beginning balance |  | [1] | (309)us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_MTwoMSegmentMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember | [1]
Amortization |  | [1] | (252)us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = ACFN_MTwoMSegmentMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember | [1]
Impairment |  | [1] | 561 us-gaap_ImpairmentOfIntangibleAssetsFinitelived / us-gaap_StatementBusinessSegmentsAxis = ACFN_MTwoMSegmentMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember | [1]
Sale of Bushing IQ (see Note 4(c)) |  | [1] |  | [1]
Cumulative translation adjustment |  | [1] |  | [1]
Intangible assets, Ending balance |  | [1] |  | [1]
M2M Segment [Member] | Cost [Member] |  |  |  |
Intangible assets, Beginning balance |  |  | 4,385 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_IncomeStatementLocationAxis = ACFN_CostMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_MTwoMSegmentMember |
Amortization |  |  |  |
Impairment |  |  | (4,385)us-gaap_ImpairmentOfIntangibleAssetsFinitelived / us-gaap_IncomeStatementLocationAxis = ACFN_CostMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_MTwoMSegmentMember |
Sale of Bushing IQ (see Note 4(c)) |  |  |  |
Cumulative translation adjustment |  |  |  |
Intangible assets, Ending balance |  |  |  |
PM [Member] | Accumulated Amortization [Member] |  |  |  |
Intangible assets, Beginning balance |  | [1],[2] | (118)us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = ACFN_PipelineMonitoringMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember | [1],[2]
Amortization |  | [1],[2] | (101)us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = ACFN_PipelineMonitoringMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember | [1],[2]
Impairment |  | [1],[2] | 219 us-gaap_ImpairmentOfIntangibleAssetsFinitelived / us-gaap_StatementBusinessSegmentsAxis = ACFN_PipelineMonitoringMember / us-gaap_StatementEquityComponentsAxis = ACFN_AccumulatedAmortizationMember | [1],[2]
Sale of Bushing IQ (see Note 4(c)) |  | [1],[2] |  | [1],[2]
Cumulative translation adjustment |  | [1],[2] |  | [1],[2]
Intangible assets, Ending balance |  | [1],[2] |  | [1],[2]
PM [Member] | Cost [Member] |  |  |  |
Intangible assets, Beginning balance |  | [2] | 1,196 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_IncomeStatementLocationAxis = ACFN_CostMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_PipelineMonitoringMember | [2]
Amortization |  | [2] |  | [2]
Impairment |  | [2] | (1,196)us-gaap_ImpairmentOfIntangibleAssetsFinitelived / us-gaap_IncomeStatementLocationAxis = ACFN_CostMember / us-gaap_StatementBusinessSegmentsAxis = ACFN_PipelineMonitoringMember | [2]
Sale of Bushing IQ (see Note 4(c)) |  | [2] |  | [2]
Cumulative translation adjustment |  | [2] |  | [2]
Intangible assets, Ending balance |  | [2] |  | [2]
[1] | Accumulated amortization
[2] | Results for the PM segment are included in "Other" in Segment Reporting (see Note 18).

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=31042434&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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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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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
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X
- Definition Amount of write-off of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit associated with the sale of all or a portion of a reporting unit. + References No definition available. + Details
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- 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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