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Restructuring and Related Charges - Summary of Activity Related to Restructuring (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Provision | $ 294 us-gaap_RestructuringCharges | $ 1,389 us-gaap_RestructuringCharges
GridSense [Member] |  |
Beginning balance | 63 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = ACFN_GridSenseMember |
Provision | 198 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = ACFN_GridSenseMember | 594 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = ACFN_GridSenseMember
Cash payments | (223)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = ACFN_GridSenseMember | (340)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = ACFN_GridSenseMember
Non-cash settlements |  | (191)ACFN_NoncashSettlementsOfRestructingCharges / us-gaap_RestructuringPlanAxis = ACFN_GridSenseMember
Ending balance | 38 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = ACFN_GridSenseMember | 63 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = ACFN_GridSenseMember
GridSense [Member] | Inventory And Fixed Asset Impairements [Member] |  |
Beginning balance |  |
Provision |  | 191 us-gaap_RestructuringCharges / us-gaap_PublicUtilitiesInventoryAxis = ACFN_InventoryAndFixedAssetImpairementsMember / us-gaap_RestructuringPlanAxis = ACFN_GridSenseMember
Cash payments |  |
Non-cash settlements |  | (191)ACFN_NoncashSettlementsOfRestructingCharges / us-gaap_PublicUtilitiesInventoryAxis = ACFN_InventoryAndFixedAssetImpairementsMember / us-gaap_RestructuringPlanAxis = ACFN_GridSenseMember
Ending balance |  |
GridSense [Member] | Other [Member] |  |
Beginning balance |  |
Provision | 72 us-gaap_RestructuringCharges / us-gaap_PublicUtilitiesInventoryAxis = us-gaap_OtherRestructuringMember / us-gaap_RestructuringPlanAxis = ACFN_GridSenseMember |
Cash payments | (72)us-gaap_PaymentsForRestructuring / us-gaap_PublicUtilitiesInventoryAxis = us-gaap_OtherRestructuringMember / us-gaap_RestructuringPlanAxis = ACFN_GridSenseMember |
Non-cash settlements |  |
Ending balance |  |
GridSense [Member] | Facilities [Member] |  |
Beginning balance |  |
Provision | 7 us-gaap_RestructuringCharges / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = ACFN_FacilitiesMember / us-gaap_RestructuringPlanAxis = ACFN_GridSenseMember | 101 us-gaap_RestructuringCharges / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = ACFN_FacilitiesMember / us-gaap_RestructuringPlanAxis = ACFN_GridSenseMember
Cash payments | (7)us-gaap_PaymentsForRestructuring / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = ACFN_FacilitiesMember / us-gaap_RestructuringPlanAxis = ACFN_GridSenseMember | (101)us-gaap_PaymentsForRestructuring / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = ACFN_FacilitiesMember / us-gaap_RestructuringPlanAxis = ACFN_GridSenseMember
Non-cash settlements |  |
Ending balance |  |
GridSense [Member] | Employee Severance And Termination Benefits [Member] |  |
Beginning balance | 63 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = ACFN_EmployeeSeveranceAndTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = ACFN_GridSenseMember |
Provision | 119 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = ACFN_EmployeeSeveranceAndTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = ACFN_GridSenseMember | 302 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = ACFN_EmployeeSeveranceAndTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = ACFN_GridSenseMember
Cash payments | (144)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = ACFN_EmployeeSeveranceAndTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = ACFN_GridSenseMember | (239)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = ACFN_EmployeeSeveranceAndTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = ACFN_GridSenseMember
Non-cash settlements |  |
Ending balance | 38 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = ACFN_EmployeeSeveranceAndTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = ACFN_GridSenseMember | 63 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = ACFN_EmployeeSeveranceAndTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = ACFN_GridSenseMember
OmniMetrix technologies [Member] | Inventory And Fixed Asset Impairements [Member] |  |
Beginning balance |  |
Provision |  | 415 us-gaap_RestructuringCharges / us-gaap_PublicUtilitiesInventoryAxis = ACFN_InventoryAndFixedAssetImpairementsMember / us-gaap_RestructuringPlanAxis = ACFN_OmnimetrixTechnologiesMember
Cash payments |  |
Non-cash settlements |  | (415)ACFN_NoncashSettlementsOfRestructingCharges / us-gaap_PublicUtilitiesInventoryAxis = ACFN_InventoryAndFixedAssetImpairementsMember / us-gaap_RestructuringPlanAxis = ACFN_OmnimetrixTechnologiesMember
Ending balance |  |
OmniMetrix technologies [Member] | Facilities [Member] |  |
Beginning balance | 194 us-gaap_RestructuringReserve / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = ACFN_FacilitiesMember / us-gaap_RestructuringPlanAxis = ACFN_OmnimetrixTechnologiesMember |
Provision | 96 us-gaap_RestructuringCharges / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = ACFN_FacilitiesMember / us-gaap_RestructuringPlanAxis = ACFN_OmnimetrixTechnologiesMember | 202 us-gaap_RestructuringCharges / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = ACFN_FacilitiesMember / us-gaap_RestructuringPlanAxis = ACFN_OmnimetrixTechnologiesMember
Cash payments | (42)us-gaap_PaymentsForRestructuring / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = ACFN_FacilitiesMember / us-gaap_RestructuringPlanAxis = ACFN_OmnimetrixTechnologiesMember | (8)us-gaap_PaymentsForRestructuring / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = ACFN_FacilitiesMember / us-gaap_RestructuringPlanAxis = ACFN_OmnimetrixTechnologiesMember
Non-cash settlements |  |
Ending balance | 248 us-gaap_RestructuringReserve / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = ACFN_FacilitiesMember / us-gaap_RestructuringPlanAxis = ACFN_OmnimetrixTechnologiesMember | 194 us-gaap_RestructuringReserve / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = ACFN_FacilitiesMember / us-gaap_RestructuringPlanAxis = ACFN_OmnimetrixTechnologiesMember
OmniMetrix technologies [Member] | Employee Severance And Termination Benefits [Member] |  |
Beginning balance | 45 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = ACFN_EmployeeSeveranceAndTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = ACFN_OmnimetrixTechnologiesMember |
Provision |  | 178 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = ACFN_EmployeeSeveranceAndTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = ACFN_OmnimetrixTechnologiesMember
Cash payments | (45)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = ACFN_EmployeeSeveranceAndTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = ACFN_OmnimetrixTechnologiesMember | (133)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = ACFN_EmployeeSeveranceAndTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = ACFN_OmnimetrixTechnologiesMember
Non-cash settlements |  |
Ending balance |  | 45 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = ACFN_EmployeeSeveranceAndTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = ACFN_OmnimetrixTechnologiesMember
OmniMetrix [Member] |  |
Beginning balance | 239 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = ACFN_OmnimetrixMember |
Provision | 96 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = ACFN_OmnimetrixMember | 795 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = ACFN_OmnimetrixMember
Cash payments | (87)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = ACFN_OmnimetrixMember | (141)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = ACFN_OmnimetrixMember
Non-cash settlements |  | (415)ACFN_NoncashSettlementsOfRestructingCharges / us-gaap_RestructuringPlanAxis = ACFN_OmnimetrixMember
Ending balance | $ 248 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = ACFN_OmnimetrixMember | $ 239 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = ACFN_OmnimetrixMember

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- Definition Noncash Settlements Of Restructing Charges. + References No definition available. + Details
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Namespace Prefix: | ACFN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + 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 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + 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 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RestructuringPlanAxis=ACFN_OmnimetrixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
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