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Segment Reporting and Geographic Information - Reconciliation of Segment Data to Consolidated Statement Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Segment Reporting [Abstract] |  |  |  |
Total assets for reportable segments | $ 18,258 ACFN_TotalAssetsForReportableSegments |  | $ 20,789 ACFN_TotalAssetsForReportableSegments |
Assets of discontinued operations | 143 ACFN_AssetsOfDiscontinuedOperations |  | 8,081 ACFN_AssetsOfDiscontinuedOperations |
Unallocated assets of DSIT headquarters | 5,897 ACFN_UnallocatedAssetsOfDsitHeadquarters |  | 5,519 ACFN_UnallocatedAssetsOfDsitHeadquarters |
Unallocated assets of OmniMetrix headquarters | 507 ACFN_UnallocatedAssetsOfOmnimetrixHeadquarters |  | 640 ACFN_UnallocatedAssetsOfOmnimetrixHeadquarters |
Assets of corporate headquarters | 4,738 ACFN_AssetsOfCorporateHeadquarters | [1],[2] | 15,927 ACFN_AssetsOfCorporateHeadquarters | [1],[2]
Total consolidated assets | $ 29,543 us-gaap_Assets |  | $ 50,956 us-gaap_Assets |
[1] | In 2013, includes $15,829 of unrestricted cash. In 2012, includes $22,676 of unrestricted cash. In 2011, includes $33,666 of unrestricted cash, $18,000 of short-term deposits and $5,961 of funds held in escrow.
[2] | Includes $15,829 and $4,672 of unrestricted cash at December 31, 2013 and 2014, respectively.

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- Definition Assets of corporate headquarters. + References No definition available. + Details
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Balance Type: | debit
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- Definition Assets of discontinued operations. + References No definition available. + Details
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- Definition Unallocated assets of DSIT headquarters. + References No definition available. + Details
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- Definition Unallocated assets of OmniMetrix headquarters. + References No definition available. + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Details
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