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Discontinued Operations (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Disposal group, including discontinued operation, royalty expense                 $ 1,000elon_Disposalgroupincludingdiscontinuedoperationroyaltyexpense $ 52,000elon_Disposalgroupincludingdiscontinuedoperationroyaltyexpense    
Disposal Group, Including Discontinued Operation, Description and Timing of Disposal   9/30/2014                    
Proceeds from Divestiture of Businesses   4,900,000us-gaap_ProceedsFromDivestitureOfBusinesses             2,144,000us-gaap_ProceedsFromDivestitureOfBusinesses 0us-gaap_ProceedsFromDivestitureOfBusinesses 0us-gaap_ProceedsFromDivestitureOfBusinesses  
Contingent consideration discontinued operations   1,000,000elon_Contingentconsiderationdiscontinuedoperations                    
Fair value of contingent consideration receivable                 0elon_Fairvalueofcontingentconsiderationreceivable      
Restructuring Costs in Discontinued Operations                 1,400,000elon_RestructuringCostsinDiscontinuedOperations      
Grid Division related restructuring payments                 1,100,000elon_GridDivisionrelatedrestructuringpayments      
Disposal Group, Including Discontinued Operation, Revenue                 18,392,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue 40,303,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue 85,241,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue  
Disposal Group, Including Discontinued Operation, Costs of Goods Sold                 11,774,000us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold 24,988,000us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold    
Disposal Group, Including Discontinued Operation, Operating Expense                 15,614,000us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense 18,994,000us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense    
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax                 (8,996,000)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax (3,679,000)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax    
Discontinued Operation, Tax Effect of Discontinued Operation                 0us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation 0us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation    
Gain (Loss) on Disposition of Business                 (254,000)us-gaap_GainLossOnSaleOfBusiness 0us-gaap_GainLossOnSaleOfBusiness 0us-gaap_GainLossOnSaleOfBusiness  
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (2,141,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (5,579,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (1,530,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (2,704,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (269,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 549,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (1,255,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (9,250,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (3,679,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax  
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest (179,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest (239,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest (117,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest (218,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest (266,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest (176,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest (148,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest (535,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest (808,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest  
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (1,962,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (5,340,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (1,413,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (2,486,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (3,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 725,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (1,107,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (8,715,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (2,871,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity  
Revenues from related parties, discontinued operations                 112,000elon_Revenuesfromrelatedpartiesdiscontinuedoperations 4,400,000elon_Revenuesfromrelatedpartiesdiscontinuedoperations    
Scenario, Forecast [Member]                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Revenue targets to earn contingent consideration                       $ 50,000,000elon_Revenuetargetstoearncontingentconsideration
/ us-gaap_StatementScenarioAxis
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