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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
Segment Reporting [Abstract]    
Total assets for reportable segments $ 18,258ACFN_TotalAssetsForReportableSegments $ 20,789ACFN_TotalAssetsForReportableSegments
Assets of discontinued operations 143ACFN_AssetsOfDiscontinuedOperations 8,081ACFN_AssetsOfDiscontinuedOperations
Unallocated assets of DSIT headquarters 5,897ACFN_UnallocatedAssetsOfDsitHeadquarters 5,519ACFN_UnallocatedAssetsOfDsitHeadquarters
Unallocated assets of OmniMetrix headquarters 507ACFN_UnallocatedAssetsOfOmnimetrixHeadquarters 640ACFN_UnallocatedAssetsOfOmnimetrixHeadquarters
Assets of corporate headquarters 4,738ACFN_AssetsOfCorporateHeadquarters [1],[2] 15,927ACFN_AssetsOfCorporateHeadquarters [1],[2]
Total consolidated assets $ 29,543us-gaap_Assets $ 50,956us-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.