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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 PROVIDED BY (USED IN) OPERATING ACTIVITIES:    
Net loss Including noncontrolling interest $ (1,424)us-gaap_ProfitLoss $ (4,090)us-gaap_ProfitLoss
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 601us-gaap_DepreciationDepletionAndAmortization 923us-gaap_DepreciationDepletionAndAmortization
Increase in allowance for doubtful accounts 37us-gaap_ProvisionForDoubtfulAccounts 33us-gaap_ProvisionForDoubtfulAccounts
Loss on disposal of fixed assets and asset impairment charges 0us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges 3us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges
Reduction in (Increase in) accrued investment income (8)us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable 5us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable
Stock-based compensation 157us-gaap_ShareBasedCompensation 883us-gaap_ShareBasedCompensation
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability (101)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 0us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
Change in operating assets and liabilities:    
Accounts receivable (136)us-gaap_IncreaseDecreaseInAccountsReceivable 609us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories 87us-gaap_IncreaseDecreaseInInventories 824us-gaap_IncreaseDecreaseInInventories
Deferred cost of goods sold (22)elon_IncreaseDecreaseInDeferredCostOfGoodsSold 33elon_IncreaseDecreaseInDeferredCostOfGoodsSold
Other current assets (231)us-gaap_IncreaseDecreaseInOtherOperatingAssets 22us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable (1,459)us-gaap_IncreaseDecreaseInAccountsPayable 605us-gaap_IncreaseDecreaseInAccountsPayable
Accrued liabilities 14us-gaap_IncreaseDecreaseInAccruedLiabilities (1,912)us-gaap_IncreaseDecreaseInAccruedLiabilities
Deferred revenues 141us-gaap_IncreaseDecreaseInDeferredRevenue 647us-gaap_IncreaseDecreaseInDeferredRevenue
Deferred rent (9)us-gaap_IncreaseDecreaseInOtherDeferredLiability (9)us-gaap_IncreaseDecreaseInOtherDeferredLiability
Net cash used in operating activities (2,353)us-gaap_NetCashProvidedByUsedInOperatingActivities (1,424)us-gaap_NetCashProvidedByUsedInOperatingActivities
CASH FLOWS PROVIDED BY (USED IN) INVESTING ACTIVITIES:    
Purchases of available-for-sale short-term investments (3,991)us-gaap_PaymentsToAcquireAvailableForSaleSecurities (8,993)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Proceeds from maturities and sales of available-for-sale short-term investments 4,000us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities 13,983us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
Change in other long-term assets 16us-gaap_PaymentsForProceedsFromOtherInvestingActivities 3us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Proceeds from divestiture of Grid business   0us-gaap_ProceedsFromDivestitureOfBusinesses
Capital expenditures (113)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (302)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash provided by (used in) investing activities (88)us-gaap_NetCashProvidedByUsedInInvestingActivities 4,691us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOWS PROVIDED BY (USED IN) FINANCING ACTIVITIES:    
Principal payments of lease financing obligations (587)us-gaap_RepaymentsOfOtherDebt (541)us-gaap_RepaymentsOfOtherDebt
Proceeds from exercise of stock options 0us-gaap_ProceedsFromStockOptionsExercised 17us-gaap_ProceedsFromStockOptionsExercised
Repurchase of common stock from employees for payment of taxes on vesting of restricted stock units and upon exercise of stock options (104)elon_RepurchaseOfCommonStockFromEmployeesForPaymentOfTaxesOnVestingOfPerformanceSharesAndUponExerciseOfStockOptions (7)elon_RepurchaseOfCommonStockFromEmployeesForPaymentOfTaxesOnVestingOfPerformanceSharesAndUponExerciseOfStockOptions
Net cash used in financing activities (691)us-gaap_NetCashProvidedByUsedInFinancingActivities (531)us-gaap_NetCashProvidedByUsedInFinancingActivities
EFFECT OF EXCHANGE RATE CHANGES ON CASH (851)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (73)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
NET CHANGE IN CASH AND CASH EQUIVALENTS (3,983)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 2,663us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AND CASH EQUIVALENTS:    
Beginning of period 13,340us-gaap_CashAndCashEquivalentsAtCarryingValue 14,648us-gaap_CashAndCashEquivalentsAtCarryingValue
End of period 9,357us-gaap_CashAndCashEquivalentsAtCarryingValue 17,311us-gaap_CashAndCashEquivalentsAtCarryingValue
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:    
Cash paid for interest on lease financing obligations 252us-gaap_InterestPaid 285us-gaap_InterestPaid
Cash paid for income taxes $ 69us-gaap_IncomeTaxesPaidNet $ 103us-gaap_IncomeTaxesPaidNet