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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Cash flows used in operating activities:    
Net loss $ (29,599)us-gaap_ProfitLoss $ (30,989)us-gaap_ProfitLoss
Adjustments to reconcile net loss to net cash used in operating activities (see Schedule A) 22,475us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities 20,040us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
Net cash used in operating activities - continuing operations (7,124)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (10,949)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Net cash used in operating activities - discontinued operations (11,093)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations (6,854)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
Net cash used in operating activities (18,217)us-gaap_NetCashProvidedByUsedInOperatingActivities (17,803)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows provided by (used in) investing activities:    
Acquisitions of property and equipment (393)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,468)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Restricted deposits (1,008)us-gaap_PaymentsToAcquireRestrictedInvestments (114)us-gaap_PaymentsToAcquireRestrictedInvestments
Release of restricted deposits 197us-gaap_ProceedsFromSaleOfRestrictedInvestments 622us-gaap_ProceedsFromSaleOfRestrictedInvestments
Amounts funded for severance assets (179)ACFN_AmountsFundedForSeveranceAssets (268)ACFN_AmountsFundedForSeveranceAssets
Proceeds from the sale of Bushing IQ    281us-gaap_ProceedsFromDivestitureOfBusinesses
Loan to Channel Partner (640)ACFN_LoanToChannelPartner   
Repayment of loan from Channel Partner 400ACFN_RepaymentOfLoanFromChannelPartner   
Net cash used in investing activities - continuing operations (1,623)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (947)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Net cash used in investing activities - discontinued operations (184)us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations (1,998)us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
Net cash used in investing activities (1,807)us-gaap_NetCashProvidedByUsedInInvestingActivities (2,945)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows provided by (used in) financing activities:    
Proceeds from capital raises, net of transaction costs 4,006us-gaap_SaleOfStockConsiderationReceivedOnTransaction 10,375us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Short-term bank credit, net 3,147us-gaap_ProceedsFromLinesOfCredit 1,143us-gaap_ProceedsFromLinesOfCredit
Proceeds from borrowings of long-term debt 292us-gaap_ProceedsFromIssuanceOfLongTermDebt   
Repayments of long-term debt (56)us-gaap_RepaymentsOfLongTermDebt (148)us-gaap_RepaymentsOfLongTermDebt
Dividends paid    (517)us-gaap_PaymentsOfDividends
Net cash provided by financing activities - continuing operations 7,389us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 10,853us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net cash provided by financing activities - discontinued operations 300us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations 1,149us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations
Net cash provided by financing activities 7,689us-gaap_NetCashProvidedByUsedInFinancingActivities 12,002us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash and cash equivalents (71)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (122)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net decrease in cash and cash equivalents (12,406)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (8,868)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year - discontinued operations 748ACFN_CashAndCashEquivalentsAtBeginningOfYearOfDiscontinuedOperations 1,270ACFN_CashAndCashEquivalentsAtBeginningOfYearOfDiscontinuedOperations
Cash and cash equivalents at beginning of year - continuing operations 16,531ACFN_CashAndCashEquivalentsAtBeginningOfYearOfContinuingOperations 24,877ACFN_CashAndCashEquivalentsAtBeginningOfYearOfContinuingOperations
Cash and cash equivalents at end of year - discontinued operations 52ACFN_CashAndCashEquivalentsAtEndOfYearOfDiscontinuedOperations 748ACFN_CashAndCashEquivalentsAtEndOfYearOfDiscontinuedOperations
Cash and cash equivalents at end of year - continuing operations 4,821ACFN_CashAndCashEquivalentsAtEndOfYearOfContinuingOperations 16,531ACFN_CashAndCashEquivalentsAtEndOfYearOfContinuingOperations
Cash paid during the year for:    
Interest 111us-gaap_InterestPaid 29us-gaap_InterestPaid
Income taxes, net of refunds 1us-gaap_IncomeTaxesPaidNet (2,008)us-gaap_IncomeTaxesPaidNet
A. Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Loss from discontinued operations 19,140us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 9,647us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Depreciation and amortization 648us-gaap_DepreciationDepletionAndAmortization 1,072us-gaap_DepreciationDepletionAndAmortization
Change in deferred taxes 103us-gaap_DeferredIncomeTaxExpenseBenefit 154us-gaap_DeferredIncomeTaxExpenseBenefit
Impairments of goodwill and intangibles 1,773us-gaap_AssetImpairmentCharges 6,731us-gaap_AssetImpairmentCharges
Impairment of fixed assets in restructurings    573ACFN_Restructuringcostsabandonmentoffixedassets
Inventory Write-down 101us-gaap_InventoryWriteDown 163us-gaap_InventoryWriteDown
Increase in liability for accrued severance 198ACFN_IncreaseInLiabilityForEmployeeTerminationBenefits 307ACFN_IncreaseInLiabilityForEmployeeTerminationBenefits
Gain on sale of Bushing IQ    (116)us-gaap_GainLossOnSaleOfBusiness
Stock and stock option compensation 865us-gaap_ShareBasedCompensation 926us-gaap_ShareBasedCompensation
Other (149)us-gaap_OtherNoncashIncomeExpense 39us-gaap_OtherNoncashIncomeExpense
Change in operating assets and liabilities:    
Decrease (increase) in accounts receivable 677us-gaap_IncreaseDecreaseInAccountsReceivable (447)us-gaap_IncreaseDecreaseInAccountsReceivable
Increase unbilled revenue (1,469)us-gaap_IncreaseDecreaseInUnbilledReceivables (1,208)us-gaap_IncreaseDecreaseInUnbilledReceivables
Increase in inventory 773us-gaap_IncreaseDecreaseInInventories 339us-gaap_IncreaseDecreaseInInventories
Decrease (increase) in other current assets and other assets (50)us-gaap_IncreaseDecreaseInOtherOperatingAssets 1,861us-gaap_IncreaseDecreaseInOtherOperatingAssets
Increase (decrease) in accounts payable, accrued payroll, payroll taxes and social benefits, other current and non-current liabilities (133)us-gaap_IncreaseDecreaseInOperatingLiabilities (1)us-gaap_IncreaseDecreaseInOperatingLiabilities
Adjustments to reconcile net loss to net cash provided by (used in) operating activities, total 22,475us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities 20,040us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
B. Non-cash investing and financing activities:    
Adjustment of additional paid-in-capital and non-controlling interests from additional investment by Acorn in DSIT   202ACFN_AdjustmentOfAdditionalPaidInCapitalAndNoncontrollingInterestsFromInvestmentInNoncontrollingInterests
Value of shares issued under dividend reinvestment plan   117us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan
Value of warrants issued in capital raise 1,115us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims 482us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims
Liability for insufficient number of authorized shares in in capital raise $ 50ACFN_LiabilityForInsufficientNumberOfAuthorizedSharesInInCapitalRaise