2.4.0.6 Html 244 695 1 true 47 0 false 7 false false R1.htm 0001000 - Document - DEI Document Sheet http://www.acornenergy.com/role/DeiDocument DEI Document true false R2.htm 1001000 - Statement - CONSOLIDATED BALANCE SHEETS Sheet http://www.acornenergy.com/role/ConsolidatedBalanceSheets CONSOLIDATED BALANCE SHEETS false false R3.htm 1002000 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS Sheet http://www.acornenergy.com/role/ConsolidatedStatementsOfOperations CONSOLIDATED STATEMENTS OF OPERATIONS false false R4.htm 1003000 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS Sheet http://www.acornenergy.com/role/ConsolidatedStatementsOfComprehensiveLoss CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS false false R5.htm 1004000 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY Sheet http://www.acornenergy.com/role/ConsolidatedStatementsOfChangesInEquity CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY false false R6.htm 1005000 - Statement - Consolidated Statements of Cash Flows Sheet http://www.acornenergy.com/role/ConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows false false R7.htm 2101100 - Disclosure - NATURE OF OPERATIONS Sheet http://www.acornenergy.com/role/NatureOfOperations NATURE OF OPERATIONS false false R8.htm 2102100 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Sheet http://www.acornenergy.com/role/SummaryOfSignificantAccountingPolicies SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES false false R9.htm 2104100 - Disclosure - ACQUISITIONS Sheet http://www.acornenergy.com/role/Acquisitions ACQUISITIONS false false R10.htm 2105100 - Disclosure - SALE OF COALOGIX Sheet http://www.acornenergy.com/role/SaleOfCoalogix SALE OF COALOGIX false false R11.htm 2106100 - Disclosure - DISCONTINUED OPERATIONS Sheet http://www.acornenergy.com/role/DiscontinuedOperations DISCONTINUED OPERATIONS false false R12.htm 2107100 - Disclosure - OTHER INVESTMENTS Sheet http://www.acornenergy.com/role/OtherInvestments OTHER INVESTMENTS false false R13.htm 2108100 - Disclosure - NON-CONTROLLING INTERESTS Sheet http://www.acornenergy.com/role/NonControllingInterests NON-CONTROLLING INTERESTS false false R14.htm 2109100 - Disclosure - INVENTORY Sheet http://www.acornenergy.com/role/Inventory INVENTORY false false R15.htm 2110100 - Disclosure - OTHER CURRENT ASSETS Sheet http://www.acornenergy.com/role/OtherCurrentAssets OTHER CURRENT ASSETS false false R16.htm 2111100 - Disclosure - PROPERTY AND EQUIPMENT, NET Sheet http://www.acornenergy.com/role/PropertyAndEquipmentNet PROPERTY AND EQUIPMENT, NET false false R17.htm 2112100 - Disclosure - GOODWILL AND INTANGIBLE ASSETS Sheet http://www.acornenergy.com/role/GoodwillAndIntangibleAssets GOODWILL AND INTANGIBLE ASSETS false false R18.htm 2113100 - Disclosure - BANK DEBT AND OTHER DEBT Sheet http://www.acornenergy.com/role/BankDebtAndOtherDebt BANK DEBT AND OTHER DEBT false false R19.htm 2114100 - Disclosure - OTHER CURRENT LIABILITIES Sheet http://www.acornenergy.com/role/OtherCurrentLiabilities OTHER CURRENT LIABILITIES false false R20.htm 2115100 - Disclosure - ACCRUED SEVERANCE AND SEVERANCE ASSETS Sheet http://www.acornenergy.com/role/AccruedSeveranceAndSeveranceAssets ACCRUED SEVERANCE AND SEVERANCE ASSETS false false R21.htm 2116100 - Disclosure - COMMITMENTS AND CONTINGENCIES Sheet http://www.acornenergy.com/role/CommitmentsAndContingencies COMMITMENTS AND CONTINGENCIES false false R22.htm 2117100 - Disclosure - EQUITY Sheet http://www.acornenergy.com/role/Equity EQUITY false false R23.htm 2118100 - Disclosure - FINANCE EXPENSE, NET Sheet http://www.acornenergy.com/role/FinanceExpenseNet FINANCE EXPENSE, NET false false R24.htm 2119100 - Disclosure - INCOME TAXES Sheet http://www.acornenergy.com/role/IncomeTaxes INCOME TAXES false false R25.htm 2120100 - Disclosure - RELATED PARTY BALANCES AND TRANSACTIONS Sheet http://www.acornenergy.com/role/RelatedPartyBalancesAndTransactions RELATED PARTY BALANCES AND TRANSACTIONS false false R26.htm 2121100 - Disclosure - SEGMENT REPORTING Sheet http://www.acornenergy.com/role/SegmentReporting SEGMENT REPORTING false false R27.htm 2122100 - Disclosure - FINANCIAL INSTRUMENTS Sheet http://www.acornenergy.com/role/FinancialInstruments FINANCIAL INSTRUMENTS false false R28.htm 2123100 - Disclosure - FAIR VALUE MEASUREMENTS Sheet http://www.acornenergy.com/role/FairValueMeasurements FAIR VALUE MEASUREMENTS false false R29.htm 2124100 - Disclosure - SUMMARY QUARTERLY FINANCIAL DATA Sheet http://www.acornenergy.com/role/SummaryQuarterlyFinancialData SUMMARY QUARTERLY FINANCIAL DATA false false R30.htm 2125100 - Disclosure - SUBSEQUENT EVENTS Sheet http://www.acornenergy.com/role/SubsequentEvents SUBSEQUENT EVENTS false false R31.htm 2302302 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Amounts used in computing EPS (Tables) Sheet http://www.acornenergy.com/role/SummaryOfSignificantAccountingPoliciesAmountsUsedInComputingEpsTables SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Amounts used in computing EPS (Tables) false false R32.htm 2304301 - Disclosure - ACQUISITIONS (Tables) Sheet http://www.acornenergy.com/role/AcquisitionsTables ACQUISITIONS (Tables) false false R33.htm 2306301 - Disclosure - DISCONTINUED OPERATIONS (Tables) Sheet http://www.acornenergy.com/role/DiscontinuedOperationsTables DISCONTINUED OPERATIONS (Tables) false false R34.htm 2308301 - Disclosure - NON-CONTROLLING INTERESTS (Tables) Sheet http://www.acornenergy.com/role/NonControllingInterestsTables NON-CONTROLLING INTERESTS (Tables) false false R35.htm 2309301 - Disclosure - INVENTORY (Tables) Sheet http://www.acornenergy.com/role/InventoryTables INVENTORY (Tables) false false R36.htm 2310301 - Disclosure - OTHER CURRENT ASSETS (Tables) Sheet http://www.acornenergy.com/role/OtherCurrentAssetsTables OTHER CURRENT ASSETS (Tables) false false R37.htm 2311301 - Disclosure - PROPERTY AND EQUIPMENT, NET (Tables) Sheet http://www.acornenergy.com/role/PropertyAndEquipmentNetTables PROPERTY AND EQUIPMENT, NET (Tables) false false R38.htm 2312301 - Disclosure - GOODWILL AND INTANGIBLE ASSETS (Tables) Sheet http://www.acornenergy.com/role/GoodwillAndIntangibleAssetsTables GOODWILL AND INTANGIBLE ASSETS (Tables) false false R39.htm 2313301 - Disclosure - BANK DEBT AND OTHER DEBT (Tables) Sheet http://www.acornenergy.com/role/BankDebtAndOtherDebtTables BANK DEBT AND OTHER DEBT (Tables) false false R40.htm 2314301 - Disclosure - OTHER CURRENT LIABILITIES (Tables) Sheet http://www.acornenergy.com/role/OtherCurrentLiabilitiesTables OTHER CURRENT LIABILITIES (Tables) false false R41.htm 2316301 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables) Sheet http://www.acornenergy.com/role/CommitmentsAndContingenciesTables COMMITMENTS AND CONTINGENCIES (Tables) false false R42.htm 2317301 - Disclosure - EQUITY (Tables) Sheet http://www.acornenergy.com/role/EquityTables EQUITY (Tables) false false R43.htm 2318301 - Disclosure - FINANCE EXPENSE, NET (Tables) Sheet http://www.acornenergy.com/role/FinanceExpenseNetTables FINANCE EXPENSE, NET (Tables) false false R44.htm 2319301 - Disclosure - INCOME TAXES (Tables) Sheet http://www.acornenergy.com/role/IncomeTaxesTables INCOME TAXES (Tables) false false R45.htm 2321301 - Disclosure - SEGMENT REPORTING (Tables) Sheet http://www.acornenergy.com/role/SegmentReportingTables SEGMENT REPORTING (Tables) false false R46.htm 2323301 - Disclosure - FAIR VALUE MEASUREMENTS (Tables) Sheet http://www.acornenergy.com/role/FairValueMeasurementsTables FAIR VALUE MEASUREMENTS (Tables) false false R47.htm 2324301 - Disclosure - SUMMARY QUARTERLY FINANCIAL DATA (Tables) Sheet http://www.acornenergy.com/role/SummaryQuarterlyFinancialDataTables SUMMARY QUARTERLY FINANCIAL DATA (Tables) false false R48.htm 2401403 - Disclosure - NATURE OF OPERATIONS Revenue Recognition (Details) Sheet http://www.acornenergy.com/role/NatureOfOperationsRevenueRecognitionDetails NATURE OF OPERATIONS Revenue Recognition (Details) false false R49.htm 2402403 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Principles of Consolidation (Details) Sheet http://www.acornenergy.com/role/SummaryOfSignificantAccountingPoliciesPrinciplesOfConsolidationDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Principles of Consolidation (Details) false false R50.htm 2402404 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Allowance for Doubtful Accounts (Details) Sheet http://www.acornenergy.com/role/SummaryOfSignificantAccountingPoliciesAllowanceForDoubtfulAccountsDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Allowance for Doubtful Accounts (Details) false false R51.htm 2402405 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Inventory (Details) Sheet http://www.acornenergy.com/role/SummaryOfSignificantAccountingPoliciesInventoryDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Inventory (Details) false false R52.htm 2402406 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Impairment of Long-Lived Assets (Details) Sheet http://www.acornenergy.com/role/SummaryOfSignificantAccountingPoliciesImpairmentOfLongLivedAssetsDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Impairment of Long-Lived Assets (Details) false false R53.htm 2402407 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Concentration of Credit Risk (Details) Sheet http://www.acornenergy.com/role/SummaryOfSignificantAccountingPoliciesConcentrationOfCreditRiskDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Concentration of Credit Risk (Details) false false R54.htm 2402408 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Advertising (Details) Sheet http://www.acornenergy.com/role/SummaryOfSignificantAccountingPoliciesAdvertisingDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Advertising (Details) false false R55.htm 2402409 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basic and Diluted Net Income (Loss) Per Share (Details) Sheet http://www.acornenergy.com/role/SummaryOfSignificantAccountingPoliciesBasicAndDilutedNetIncomeLossPerShareDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basic and Diluted Net Income (Loss) Per Share (Details) false false R56.htm 2402410 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Warranty Provision (Details) Sheet http://www.acornenergy.com/role/SummaryOfSignificantAccountingPoliciesWarrantyProvisionDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Warranty Provision (Details) false false R57.htm 2404402 - Disclosure - ACQUISITIONS OmniMetrix, LLC. (Details) Sheet http://www.acornenergy.com/role/AcquisitionsOmnimetrixLlcDetails ACQUISITIONS OmniMetrix, LLC. (Details) false false R58.htm 2404403 - Disclosure - ACQUISITIONS GridSense (Details) Sheet http://www.acornenergy.com/role/AcquisitionsGridsenseDetails ACQUISITIONS GridSense (Details) false false R59.htm 2404404 - Disclosure - ACQUISITIONS USSI (Details) Sheet http://www.acornenergy.com/role/AcquisitionsUssiDetails ACQUISITIONS USSI (Details) false false R60.htm 2404405 - Disclosure - ACQUISITION OF OMNIMETRIX Fair value of assets and liabilities acquired (Details) Sheet http://www.acornenergy.com/role/AcquisitionOfOmnimetrixFairValueOfAssetsAndLiabilitiesAcquiredDetails ACQUISITION OF OMNIMETRIX Fair value of assets and liabilities acquired (Details) false false R61.htm 2404406 - Disclosure - ACQUISITIONS ACQUISITION OF OMNIMETRIX - Intangible Assets Acquired (Details) Sheet http://www.acornenergy.com/role/AcquisitionsAcquisitionOfOmnimetrixIntangibleAssetsAcquiredDetails ACQUISITIONS ACQUISITION OF OMNIMETRIX - Intangible Assets Acquired (Details) false false R62.htm 2405402 - Disclosure - SALE OF COALOGIX (Details) Sheet http://www.acornenergy.com/role/SaleOfCoalogixDetails SALE OF COALOGIX (Details) false false R63.htm 2406403 - Disclosure - DISCONTINUED OPERATIONS Coreworx (Details) Sheet http://www.acornenergy.com/role/DiscontinuedOperationsCoreworxDetails DISCONTINUED OPERATIONS Coreworx (Details) false false R64.htm 2406404 - Disclosure - DISCONTINUED OPERATIONS Summary of Discountinued Operations (Details) Sheet http://www.acornenergy.com/role/DiscontinuedOperationsSummaryOfDiscountinuedOperationsDetails DISCONTINUED OPERATIONS Summary of Discountinued Operations (Details) false false R65.htm 2407402 - Disclosure - OTHER INVESTMENTS (Details) Sheet http://www.acornenergy.com/role/OtherInvestmentsDetails OTHER INVESTMENTS (Details) false false R66.htm 2407403 - Disclosure - OTHER INVESTMENTS EnerTech Capital Partners (Details) Sheet http://www.acornenergy.com/role/OtherInvestmentsEnertechCapitalPartnersDetails OTHER INVESTMENTS EnerTech Capital Partners (Details) false false R67.htm 2407404 - Disclosure - OTHER INVESTMENTS HangXing (Details) Sheet http://www.acornenergy.com/role/OtherInvestmentsHangxingDetails OTHER INVESTMENTS HangXing (Details) false false R68.htm 2408402 - Disclosure - NON-CONTROLLING INTERESTS (Details) Sheet http://www.acornenergy.com/role/NonControllingInterestsDetails NON-CONTROLLING INTERESTS (Details) false false R69.htm 2409402 - Disclosure - INVENTORY (Details) Sheet http://www.acornenergy.com/role/InventoryDetails INVENTORY (Details) false false R70.htm 2410402 - Disclosure - OTHER CURRENT ASSETS (Details) Sheet http://www.acornenergy.com/role/OtherCurrentAssetsDetails OTHER CURRENT ASSETS (Details) false false R71.htm 2411402 - Disclosure - PROPERTY AND EQUIPMENT, NET (Details) Sheet http://www.acornenergy.com/role/PropertyAndEquipmentNetDetails PROPERTY AND EQUIPMENT, NET (Details) false false R72.htm 2412402 - Disclosure - GOODWILL AND INTANGIBLE ASSETS (Details) Sheet http://www.acornenergy.com/role/GoodwillAndIntangibleAssetsDetails GOODWILL AND INTANGIBLE ASSETS (Details) false false R73.htm 2412403 - Disclosure - GOODWILL AND INTANGIBLE ASSETS Schedule of Intangibles (Details) Sheet http://www.acornenergy.com/role/GoodwillAndIntangibleAssetsScheduleOfIntangiblesDetails GOODWILL AND INTANGIBLE ASSETS Schedule of Intangibles (Details) false false R74.htm 2412404 - Disclosure - GOODWILL AND INTANGIBLE ASSETS Amortization expense - current period and prior period (Details) Sheet http://www.acornenergy.com/role/GoodwillAndIntangibleAssetsAmortizationExpenseCurrentPeriodAndPriorPeriodDetails GOODWILL AND INTANGIBLE ASSETS Amortization expense - current period and prior period (Details) false false R75.htm 2412405 - Disclosure - GOODWILL AND INTANGIBLE ASSETS Future year's amortization expense (Details) Sheet http://www.acornenergy.com/role/GoodwillAndIntangibleAssetsFutureYearsAmortizationExpenseDetails GOODWILL AND INTANGIBLE ASSETS Future year's amortization expense (Details) false false R76.htm 2413402 - Disclosure - BANK DEBT AND OTHER DEBT (Details) Sheet http://www.acornenergy.com/role/BankDebtAndOtherDebtDetails BANK DEBT AND OTHER DEBT (Details) false false R77.htm 2413403 - Disclosure - BANK DEBT AND OTHER DEBT Debt Summary (Details) Sheet http://www.acornenergy.com/role/BankDebtAndOtherDebtDebtSummaryDetails BANK DEBT AND OTHER DEBT Debt Summary (Details) false false R78.htm 2414402 - Disclosure - OTHER CURRENT LIABILITIES (Details) Sheet http://www.acornenergy.com/role/OtherCurrentLiabilitiesDetails OTHER CURRENT LIABILITIES (Details) false false R79.htm 2415403 - Disclosure - ACCRUED SEVERANCE AND SEVERANCE ASSETS Accrued Severance and Severance Assets (Details) Sheet http://www.acornenergy.com/role/AccruedSeveranceAndSeveranceAssetsAccruedSeveranceAndSeveranceAssetsDetails ACCRUED SEVERANCE AND SEVERANCE ASSETS Accrued Severance and Severance Assets (Details) false false R80.htm 2415404 - Disclosure - ACCRUED SEVERANCE AND SEVERANCE ASSETS Defined Contribution Plans (Details) Sheet http://www.acornenergy.com/role/AccruedSeveranceAndSeveranceAssetsDefinedContributionPlansDetails ACCRUED SEVERANCE AND SEVERANCE ASSETS Defined Contribution Plans (Details) false false R81.htm 2416403 - Disclosure - COMMITMENTS AND CONTINGENCIES Leases of property and equipment (Details) Sheet http://www.acornenergy.com/role/CommitmentsAndContingenciesLeasesOfPropertyAndEquipmentDetails COMMITMENTS AND CONTINGENCIES Leases of property and equipment (Details) false false R82.htm 2416404 - Disclosure - COMMITMENTS AND CONTINGENCIES Guarantees (Details) Sheet http://www.acornenergy.com/role/CommitmentsAndContingenciesGuaranteesDetails COMMITMENTS AND CONTINGENCIES Guarantees (Details) false false R83.htm 2416405 - Disclosure - COMMITMENTS AND CONTINGENCIES Royalties (Details) Sheet http://www.acornenergy.com/role/CommitmentsAndContingenciesRoyaltiesDetails COMMITMENTS AND CONTINGENCIES Royalties (Details) false false R84.htm 2417402 - Disclosure - EQUITY General (Details) Sheet http://www.acornenergy.com/role/EquityGeneralDetails EQUITY General (Details) false false R85.htm 2417403 - Disclosure - EQUITY Dividend Reinvestment Plan (Details) Sheet http://www.acornenergy.com/role/EquityDividendReinvestmentPlanDetails EQUITY Dividend Reinvestment Plan (Details) false false R86.htm 2417404 - Disclosure - EQUITY Dividends (Details) Sheet http://www.acornenergy.com/role/EquityDividendsDetails EQUITY Dividends (Details) false false R87.htm 2417405 - Disclosure - EQUITY Dividends paid (Details) Sheet http://www.acornenergy.com/role/EquityDividendsPaidDetails EQUITY Dividends paid (Details) false false R88.htm 2417406 - Disclosure - EQUITY Capital Raise (Details) Sheet http://www.acornenergy.com/role/EquityCapitalRaiseDetails EQUITY Capital Raise (Details) false false R89.htm 2417407 - Disclosure - EQUITY Directors and Officers (Details) Sheet http://www.acornenergy.com/role/EquityDirectorsAndOfficersDetails EQUITY Directors and Officers (Details) false false R90.htm 2417408 - Disclosure - EQUITY Stock option activity (Details) Sheet http://www.acornenergy.com/role/EquityStockOptionActivityDetails EQUITY Stock option activity (Details) false false R91.htm 2417409 - Disclosure - EQUITY - Non-employee option grants (Details) Sheet http://www.acornenergy.com/role/EquityNonEmployeeOptionGrantsDetails EQUITY - Non-employee option grants (Details) false false R92.htm 2417410 - Disclosure - EQUITY Option Exercised (Details) Sheet http://www.acornenergy.com/role/EquityOptionExercisedDetails EQUITY Option Exercised (Details) false false R93.htm 2417411 - Disclosure - EQUITY Stock Options By Exercise Price Range (Details) Sheet http://www.acornenergy.com/role/EquityStockOptionsByExercisePriceRangeDetails EQUITY Stock Options By Exercise Price Range (Details) false false R94.htm 2417412 - Disclosure - EQUITY Weighted average fair value of options granted (Details) Sheet http://www.acornenergy.com/role/EquityWeightedAverageFairValueOfOptionsGrantedDetails EQUITY Weighted average fair value of options granted (Details) false false R95.htm 2417413 - Disclosure - EQUITY Share-based compensation option-pricing model assumptions (Details) Sheet http://www.acornenergy.com/role/EquityShareBasedCompensationOptionPricingModelAssumptionsDetails EQUITY Share-based compensation option-pricing model assumptions (Details) false false R96.htm 2417414 - Disclosure - EQUITY USSI Stock Option Plan (Details) Sheet http://www.acornenergy.com/role/EquityUssiStockOptionPlanDetails EQUITY USSI Stock Option Plan (Details) false false R97.htm 2417415 - Disclosure - EQUITY Share-based compensation expense (Details) Sheet http://www.acornenergy.com/role/EquityShareBasedCompensationExpenseDetails EQUITY Share-based compensation expense (Details) false false R98.htm 2417416 - Disclosure - EQUITY Net warrant exercise (Details) Sheet http://www.acornenergy.com/role/EquityNetWarrantExerciseDetails EQUITY Net warrant exercise (Details) false false R99.htm 2417417 - Disclosure - EQUITY Warrants (Details) Sheet http://www.acornenergy.com/role/EquityWarrantsDetails EQUITY Warrants (Details) false false R100.htm 2417418 - Disclosure - EQUITY - DSIT Option Plan (Details) Sheet http://www.acornenergy.com/role/EquityDsitOptionPlanDetails EQUITY - DSIT Option Plan (Details) false false R101.htm 2417419 - Disclosure - EQUITY - DSIT Option Plan by Exercise Price Range (Details) Sheet http://www.acornenergy.com/role/EquityDsitOptionPlanByExercisePriceRangeDetails EQUITY - DSIT Option Plan by Exercise Price Range (Details) false false R102.htm 2417420 - Disclosure - EQUITY Stock Option Activity - USSI (Details) Sheet http://www.acornenergy.com/role/EquityStockOptionActivityUssiDetails EQUITY Stock Option Activity - USSI (Details) false false R103.htm 2417421 - Disclosure - EQUITY Warrants Activity (Details) Sheet http://www.acornenergy.com/role/EquityWarrantsActivityDetails EQUITY Warrants Activity (Details) false false R104.htm 2417422 - Disclosure - EQUITY - Treasury Shares (Details) Sheet http://www.acornenergy.com/role/EquityTreasurySharesDetails EQUITY - Treasury Shares (Details) false false R105.htm 2418402 - Disclosure - FINANCE EXPENSE, NET (Details) Sheet http://www.acornenergy.com/role/FinanceExpenseNetDetails FINANCE EXPENSE, NET (Details) false false R106.htm 2419402 - Disclosure - INCOME TAXES (Details) Sheet http://www.acornenergy.com/role/IncomeTaxesDetails INCOME TAXES (Details) false false R107.htm 2419403 - Disclosure - INCOME TAXES composition of income tax expense (benefit) (Details) Sheet http://www.acornenergy.com/role/IncomeTaxesCompositionOfIncomeTaxExpenseBenefitDetails INCOME TAXES composition of income tax expense (benefit) (Details) false false R108.htm 2419404 - Disclosure - INCOME TAXES effective income tax rates (Details) Sheet http://www.acornenergy.com/role/IncomeTaxesEffectiveIncomeTaxRatesDetails INCOME TAXES effective income tax rates (Details) false false R109.htm 2419405 - Disclosure - INCOME TAXES analysis of deferred tax assets and (liabilities) (Details) Sheet http://www.acornenergy.com/role/IncomeTaxesAnalysisOfDeferredTaxAssetsAndLiabilitiesDetails INCOME TAXES analysis of deferred tax assets and (liabilities) (Details) false false R110.htm 2419406 - Disclosure - INCOME TAXES summary of tax loss carryforwards (Details) Sheet http://www.acornenergy.com/role/IncomeTaxesSummaryOfTaxLossCarryforwardsDetails INCOME TAXES summary of tax loss carryforwards (Details) false false R111.htm 2419407 - Disclosure - INCOME TAXES Uncertain Tax Positions (UTP) (Details) Sheet http://www.acornenergy.com/role/IncomeTaxesUncertainTaxPositionsUtpDetails INCOME TAXES Uncertain Tax Positions (UTP) (Details) false false R112.htm 2419408 - Disclosure - INCOME TAXES Taxation in the United States (Details) Sheet http://www.acornenergy.com/role/IncomeTaxesTaxationInUnitedStatesDetails INCOME TAXES Taxation in the United States (Details) false false R113.htm 2419409 - Disclosure - INCOME TAXES Taxation in Israel (Details) Sheet http://www.acornenergy.com/role/IncomeTaxesTaxationInIsraelDetails INCOME TAXES Taxation in Israel (Details) false false R114.htm 2419410 - Disclosure - INCOME TAXES Taxation in Australia (Details) Sheet http://www.acornenergy.com/role/IncomeTaxesTaxationInAustraliaDetails INCOME TAXES Taxation in Australia (Details) false false R115.htm 2420402 - Disclosure - RELATED PARTY BALANCES AND TRANSACTIONS (Details) Sheet http://www.acornenergy.com/role/RelatedPartyBalancesAndTransactionsDetails RELATED PARTY BALANCES AND TRANSACTIONS (Details) false false R116.htm 2421402 - Disclosure - SEGMENT REPORTING (Details) Sheet http://www.acornenergy.com/role/SegmentReportingDetails SEGMENT REPORTING (Details) false false R117.htm 2421403 - Disclosure - SEGMENT REPORTING Reconciliation of Segment Income (Loss) to Consolidated Net Income (Loss) (Details) Sheet http://www.acornenergy.com/role/SegmentReportingReconciliationOfSegmentIncomeLossToConsolidatedNetIncomeLossDetails SEGMENT REPORTING Reconciliation of Segment Income (Loss) to Consolidated Net Income (Loss) (Details) false false R118.htm 2421404 - Disclosure - SEGMENT REPORTING SEGMENT REPORTING - Reconciliation of total consolidated assets (Details) Sheet http://www.acornenergy.com/role/SegmentReportingSegmentReportingReconciliationOfTotalConsolidatedAssetsDetails SEGMENT REPORTING SEGMENT REPORTING - Reconciliation of total consolidated assets (Details) false false R119.htm 2421405 - Disclosure - SEGMENT REPORTING Reconciliation of segment assets - other significant items (Details) Sheet http://www.acornenergy.com/role/SegmentReportingReconciliationOfSegmentAssetsOtherSignificantItemsDetails SEGMENT REPORTING Reconciliation of segment assets - other significant items (Details) false false R120.htm 2421406 - Disclosure - SEGMENT REPORTING SEGMENT REPORTING - Revenues based on location of customer (Details) Sheet http://www.acornenergy.com/role/SegmentReportingSegmentReportingRevenuesBasedOnLocationOfCustomerDetails SEGMENT REPORTING SEGMENT REPORTING - Revenues based on location of customer (Details) false false R121.htm 2421407 - Disclosure - SEGMENT REPORTING SEGMENT REPORTING - Major customers (Details) Sheet http://www.acornenergy.com/role/SegmentReportingSegmentReportingMajorCustomersDetails SEGMENT REPORTING SEGMENT REPORTING - Major customers (Details) false false R122.htm 2423402 - Disclosure - FAIR VALUE MEASUREMENTS (Details) Sheet http://www.acornenergy.com/role/FairValueMeasurementsDetails FAIR VALUE MEASUREMENTS (Details) false false R123.htm 2424402 - Disclosure - SUMMARY QUARTERLY FINANCIAL DATA (Details) Sheet http://www.acornenergy.com/role/SummaryQuarterlyFinancialDataDetails SUMMARY QUARTERLY FINANCIAL DATA (Details) false false R124.htm 2425401 - Disclosure - SUBSEQUENT EVENTS Acorn investment in USSI (Details) Sheet http://www.acornenergy.com/role/SubsequentEventsAcornInvestmentInUssiDetails SUBSEQUENT EVENTS Acorn investment in USSI (Details) false false R125.htm 2425402 - Disclosure - SUBSEQUENT EVENTS Acorn Dividend (Details) Sheet http://www.acornenergy.com/role/SubsequentEventsAcornDividendDetails SUBSEQUENT EVENTS Acorn Dividend (Details) false false R126.htm 2425403 - Disclosure - SUBSEQUENT EVENTS GridSense Employee Incentive Plan (Details) Sheet http://www.acornenergy.com/role/SubsequentEventsGridsenseEmployeeIncentivePlanDetails SUBSEQUENT EVENTS GridSense Employee Incentive Plan (Details) false false All Reports Book All Reports Element acfn_NetLossFromDiscontinuedOperationsNetOfIncomeTaxesCoreworx had a mix of decimals attribute values: -3 0. Element acfn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExerciseableNumberDsitOptionPlan had a mix of decimals attribute values: -3 0. Element acfn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodDsitOptionPlan had a mix of decimals attribute values: -3 0. Element acfn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodTotalDsitOptionPlan had a mix of decimals attribute values: -3 0. Element acfn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePriceTotalDsitOptionPlan had a mix of decimals attribute values: -3 0. Element acfn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrossDsitOptionPlan had a mix of decimals attribute values: -3 0. Element acfn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceUssiOptionPlan had a mix of decimals attribute values: 0 2. Element acfn_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesForCashInPeriodWeightedAverageExercisePrice had a mix of decimals attribute values: 0 2. Element acfn_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePriceDsitOptionPlan had a mix of decimals attribute values: -3 0. Element acfn_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePriceDsitOptionPlan had a mix of decimals attribute values: -3 0. Element acfn_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsNetExercisesInPeriodWeightedAverageExercisePrice had a mix of decimals attribute values: 0 2. Element acfn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePriceDsitOptionPlan had a mix of decimals attribute values: -3 0. Element acfn_SharesIssuedInDecemberCapitalRaise had a mix of decimals attribute values: -3 0. Element acfn_SpecialDividendPaidPerShare had a mix of decimals attribute values: 0 2. Element us-gaap_ProceedsFromWarrantExercises had a mix of decimals attribute values: -3 0. Element us-gaap_RepaymentsOfOtherDebt had a mix of decimals attribute values: -3 0. Element us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate had a mix of decimals attribute values: 2 3. Element us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan had a mix of decimals attribute values: -3 0. Element us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised had a mix of decimals attribute values: -3 0. 'Shares' elements on report '1004000 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY' had a mix of different decimal attribute values. 'Monetary' elements on report '2406404 - Disclosure - DISCONTINUED OPERATIONS Summary of Discountinued Operations (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '2413402 - Disclosure - BANK DEBT AND OTHER DEBT (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '2416405 - Disclosure - COMMITMENTS AND CONTINGENCIES Royalties (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '2420402 - Disclosure - RELATED PARTY BALANCES AND TRANSACTIONS (Details)' had a mix of different decimal attribute values. Process Flow-Through: 1001000 - Statement - CONSOLIDATED BALANCE SHEETS Process Flow-Through: Removing column 'Dec. 31, 2009' Process Flow-Through: 1002000 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2012' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2012' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2012' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2012' Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2011' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2011' Process Flow-Through: 1003000 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2012' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2012' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2012' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2012' Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2011' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2011' Process Flow-Through: 1005000 - Statement - Consolidated Statements of Cash Flows Process Flow-Through: Removing column 'Feb. 15, 2012 OmniMetrix acquistion [Member]' acfn-20121231.xml acfn-20121231.xsd acfn-20121231_cal.xml acfn-20121231_def.xml acfn-20121231_lab.xml acfn-20121231_pre.xml true true