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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 4,821us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 16,531us-gaap_CashAndCashEquivalentsAtCarryingValue
Restricted deposit	467us-gaap_RestrictedInvestmentsCurrent	306us-gaap_RestrictedInvestmentsCurrent
Accounts receivable, net	4,902us-gaap_AccountsReceivableNetCurrent	5,710us-gaap_AccountsReceivableNetCurrent
Unbilled revenue	7,890us-gaap_UnbilledContractsReceivable	6,421us-gaap_UnbilledContractsReceivable
Inventory	1,374us-gaap_InventoryNet	2,261us-gaap_InventoryNet
Other current assets	1,813us-gaap_OtherAssetsCurrent	1,546us-gaap_OtherAssetsCurrent
Current assets - discontinued operations	143us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	3,176us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
Total current assets	21,410us-gaap_AssetsCurrent	35,951us-gaap_AssetsCurrent
Property and equipment, net	1,080us-gaap_PropertyPlantAndEquipmentNet	1,146us-gaap_PropertyPlantAndEquipmentNet
Severance assets	3,256ACFN_SeveranceAssetsnoncurrent	3,539ACFN_SeveranceAssetsnoncurrent
Restricted deposits	650us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
Intangible assets, net	1,211us-gaap_IntangibleAssetsNetExcludingGoodwill	1,550us-gaap_IntangibleAssetsNetExcludingGoodwill
Goodwill	1,031us-gaap_Goodwill	3,027us-gaap_Goodwill
Other assets	905us-gaap_OtherAssetsNoncurrent	838us-gaap_OtherAssetsNoncurrent
Non-current assets - discontinued operations		4,905us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssets
Total assets	29,543us-gaap_Assets	50,956us-gaap_Assets
Current liabilities:
Short-term bank credit and current maturities of long-term debt	4,419us-gaap_DebtCurrent	1,143us-gaap_DebtCurrent
Accounts payable	2,187us-gaap_AccountsPayableCurrent	1,945us-gaap_AccountsPayableCurrent
Accrued payroll, payroll taxes and social benefits	1,584us-gaap_EmployeeRelatedLiabilitiesCurrent	2,028us-gaap_EmployeeRelatedLiabilitiesCurrent
Deferred revenue	1,634us-gaap_DeferredRevenueCurrent	1,729us-gaap_DeferredRevenueCurrent
Other current liabilities	3,028us-gaap_OtherLiabilitiesCurrent	3,136us-gaap_OtherLiabilitiesCurrent
Current liabilities held for sale	4,693us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation	3,890us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation
Total current liabilities	17,545us-gaap_LiabilitiesCurrent	13,871us-gaap_LiabilitiesCurrent
Long-term liabilities:
Accrued severance	4,594ACFN_SupplementalUnemploymentBenefitsSeverancenoncurrent	4,973ACFN_SupplementalUnemploymentBenefitsSeverancenoncurrent
Other long-term liabilities	1,011us-gaap_OtherLiabilitiesNoncurrent	600us-gaap_OtherLiabilitiesNoncurrent
Total long-term liabilities	5,605us-gaap_LiabilitiesNoncurrent	5,573us-gaap_LiabilitiesNoncurrent
Commitments and contingencies (Note 13)
Equity:
Common stock - $0.01 par value per share: Authorized - 30,000,000 shares; Issued - 22,957,859 and 27,277,511 shares at December 31, 2013 and 2014, respectively.	272us-gaap_CommonStockValue	229us-gaap_CommonStockValue
Additional paid-in capital	97,607us-gaap_AdditionalPaidInCapitalCommonStock	93,943us-gaap_AdditionalPaidInCapitalCommonStock
Warrants	1,641us-gaap_WarrantsAndRightsOutstanding	526us-gaap_WarrantsAndRightsOutstanding
Accumulated deficit	(86,592)us-gaap_RetainedEarningsAccumulatedDeficit	(59,447)us-gaap_RetainedEarningsAccumulatedDeficit
Treasury stock, at cost - 801,920 shares at December 31, 2013 and 2014 respectively.	(3,036)us-gaap_TreasuryStockValue	(3,036)us-gaap_TreasuryStockValue
Accumulated other comprehensive income (loss)	(212)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	184us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total Acorn Energy, Inc. shareholders' equity	9,680us-gaap_StockholdersEquity	32,399us-gaap_StockholdersEquity
Non-controlling interests	(3,287)us-gaap_MinorityInterest	(887)us-gaap_MinorityInterest
Total equity	6,393us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	31,512us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total liabilities and equity	$ 29,543us-gaap_LiabilitiesAndStockholdersEquity	$ 50,956us-gaap_LiabilitiesAndStockholdersEquity

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