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Discontinued Operations - Schedule of Financial Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Revenues	$ 19,560us-gaap_Revenues	$ 20,288us-gaap_Revenues
Gross profit	6,638us-gaap_GrossProfit	7,503us-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	556us-gaap_Revenues / dei_LegalEntityAxis = ACFN_USSeismicSystemsIncMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember	1,468us-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	2,407us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = ACFN_USSeismicSystemsIncMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember	1,213us-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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