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Discontinued Operations - Schedule of Financial Information (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Revenues | $ 19,560 us-gaap_Revenues | $ 20,288 us-gaap_Revenues
Gross profit | 6,638 us-gaap_GrossProfit | 7,503 us-gaap_GrossProfit
Net loss | (29,599)us-gaap_ProfitLoss | (30,989)us-gaap_ProfitLoss
Net loss attributable to Acorn Energy Inc. | (27,145)us-gaap_NetIncomeLoss | (29,714)us-gaap_NetIncomeLoss
U.S. Seismic Systems, Inc [Member] | Discontinued Operations [Member] |  |
Revenues | 556 us-gaap_Revenues / dei_LegalEntityAxis = ACFN_USSeismicSystemsIncMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember | 1,468 us-gaap_Revenues / dei_LegalEntityAxis = ACFN_USSeismicSystemsIncMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Gross profit | (1,043)us-gaap_GrossProfit / dei_LegalEntityAxis = ACFN_USSeismicSystemsIncMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember | (2,347)us-gaap_GrossProfit / dei_LegalEntityAxis = ACFN_USSeismicSystemsIncMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Net loss | (19,140)us-gaap_ProfitLoss / dei_LegalEntityAxis = ACFN_USSeismicSystemsIncMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember | (9,647)us-gaap_ProfitLoss / dei_LegalEntityAxis = ACFN_USSeismicSystemsIncMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Net loss attributable to non-controlling interests | 2,407 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = ACFN_USSeismicSystemsIncMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember | 1,213 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = ACFN_USSeismicSystemsIncMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Net loss attributable to Acorn Energy Inc. | $ (16,733)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = ACFN_USSeismicSystemsIncMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember | $ (8,434)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = ACFN_USSeismicSystemsIncMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember

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