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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows used in operating activities:    
Net loss $ (2,934)us-gaap_ProfitLoss $ (4,575)us-gaap_ProfitLoss
Adjustments to reconcile net loss to net cash used in operating activities (see Schedule A) 1,826us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities 3,398us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
Net cash used in operating activities - continuing operations (1,108)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (1,177)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Net cash used in operating activities - discontinued operations (1,430)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations (2,604)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
Net cash used in operating activities (2,538)us-gaap_NetCashProvidedByUsedInOperatingActivities (3,781)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows provided by (used in) investing activities:    
Acquisitions of property and equipment (80)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (206)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Restricted deposits (98)ACFN_RestrictedDeposits (590)ACFN_RestrictedDeposits
Release of restricted deposits 99ACFN_ReleaseOfRestrictedDeposits 74ACFN_ReleaseOfRestrictedDeposits
Amounts funded for severance assets (91)ACFN_AmountsFundedForSeveranceAssets (33)ACFN_AmountsFundedForSeveranceAssets
Net cash used in investing activities - continuing operations (170)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (755)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Net cash used in investing activities - discontinued operations    (134)us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
Net cash used in investing activities (170)us-gaap_NetCashProvidedByUsedInInvestingActivities (889)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows provided by (used in) financing activities:    
Short-term bank credit, net 112us-gaap_ProceedsFromLinesOfCredit 342us-gaap_ProceedsFromLinesOfCredit
Repayments of long-term debt (32)us-gaap_RepaymentsOfLongTermDebt   
Net cash provided by financing activities - continuing operations 80us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 342us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net cash used in financing activities - discontinued operations    (130)us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations
Net cash provided by financing activities 80us-gaap_NetCashProvidedByUsedInFinancingActivities 212us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash and cash equivalents (59)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 10us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net decrease in cash and cash equivalents (2,687)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (4,448)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at the beginning of the year - discontinued operations 52ACFN_CashAndCashEquivalentsAtBeginningOfYearOfDiscontinuedOperations 748ACFN_CashAndCashEquivalentsAtBeginningOfYearOfDiscontinuedOperations
Cash and cash equivalents at the beginning of the year - continuing operations 4,821ACFN_CashAndCashEquivalentsAtBeginningOfYearOfContinuingOperations 16,531ACFN_CashAndCashEquivalentsAtBeginningOfYearOfContinuingOperations
Cash and cash equivalents at the end of the period - discontinued operations 87ACFN_CashAndCashEquivalentsAtEndOfYearOfDiscontinuedOperations 9ACFN_CashAndCashEquivalentsAtEndOfYearOfDiscontinuedOperations
Cash and cash equivalents at the end of the period - continuing operations 2,099ACFN_CashAndCashEquivalentsAtEndOfYearOfContinuingOperations 12,822ACFN_CashAndCashEquivalentsAtEndOfYearOfContinuingOperations
A. Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Loss from discontinued operations 1,152us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 1,956us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Depreciation and amortization 132us-gaap_DepreciationDepletionAndAmortization 195us-gaap_DepreciationDepletionAndAmortization
Increase in accrued severance 109ACFN_IncreaseInLiabilityForEmployeeTerminationBenefits 39ACFN_IncreaseInLiabilityForEmployeeTerminationBenefits
Stock-based compensation 208us-gaap_ShareBasedCompensation 310us-gaap_ShareBasedCompensation
Deferred taxes (33)us-gaap_DeferredIncomeTaxExpenseBenefit (57)us-gaap_DeferredIncomeTaxExpenseBenefit
Other 10us-gaap_OtherNoncashIncomeExpense (3)us-gaap_OtherNoncashIncomeExpense
Change in operating assets and liabilities:    
Decrease (increase) in accounts receivable, unbilled revenue, other current and other assets (184)us-gaap_IncreaseDecreaseInOtherOperatingAssets 2,021us-gaap_IncreaseDecreaseInOtherOperatingAssets
Decrease in inventory 36us-gaap_IncreaseDecreaseInInventories 37us-gaap_IncreaseDecreaseInInventories
Increase (decrease) in accounts payable, accrued payroll, payroll taxes and social benefits, deferred revenues, other current liabilities and other liabilities 396us-gaap_IncreaseDecreaseInOperatingLiabilities (1,100)us-gaap_IncreaseDecreaseInOperatingLiabilities
Adjustments to reconcile net loss to net cash provided by (used in) operating activities, total $ 1,826us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities $ 3,398us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities