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Acquisitions (Details) (USD $)
3 Months Ended
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Aug. 15, 2014
Business Acquisition [Line Items]          
Business Combination, Contingent Consideration, Liability $ 925,000us-gaap_BusinessCombinationContingentConsiderationLiability $ 968,000us-gaap_BusinessCombinationContingentConsiderationLiability      
Goodwill   5,936,000us-gaap_Goodwill 8,390,000us-gaap_Goodwill 8,276,000us-gaap_Goodwill  
Lumewave, Inc. [Member]          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents 630,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= elon_LumewaveInc.Member
       
Business Acquisition, Effective Date of Acquisition Aug. 15, 2014        
Business Acquisition, Percentage of Voting Interests Acquired         100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= elon_LumewaveInc.Member
Business Acquisition, Name of Acquired Entity Lumewave, Inc.        
Payments to Acquire Businesses, Gross 1,800,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= elon_LumewaveInc.Member
       
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable 715,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= elon_LumewaveInc.Member
       
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High         1,300,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= elon_LumewaveInc.Member
Business Combination, Contingent Consideration, Liability 925,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= elon_LumewaveInc.Member
968,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= elon_LumewaveInc.Member
     
Business Acquisition, Working Capital Adjustment to Consideration Transferrred         225,000elon_BusinessAcquisitionWorkingCapitalAdjustmenttoConsiderationTransferrred
/ us-gaap_BusinessAcquisitionAxis
= elon_LumewaveInc.Member
Business Combination, Acquired Receivables, Fair Value 107,000us-gaap_BusinessCombinationAcquiredReceivablesFairValue
/ us-gaap_BusinessAcquisitionAxis
= elon_LumewaveInc.Member
       
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory 31,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= elon_LumewaveInc.Member
       
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets 259,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= elon_LumewaveInc.Member
       
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 23,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= elon_LumewaveInc.Member
       
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 1,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= elon_LumewaveInc.Member
       
Goodwill 1,257,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= elon_LumewaveInc.Member
       
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable (352,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= elon_LumewaveInc.Member
       
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities (255,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= elon_LumewaveInc.Member
       
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net 3,200,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= elon_LumewaveInc.Member
       
Developed Technology Rights [Member]          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
       
Customer Relationships [Member]          
Business Acquisition [Line Items]          
Finite lived intangible asset, useful life range, Low value 6 years 6 months        
Fair value inputs, discount range, low end of range 0.21elon_Fairvalueinputsdiscountrangelowendofrange
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
       
Fair value inputs, discount range, high end of range 0.22elon_Fairvalueinputsdiscountrangehighendofrange
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
       
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
       
Trade Names [Member]          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 200,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember