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Significant Customers (Details Textual)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenues attributable to sales [Line Items]    
Total 35.20%us-gaap_ConcentrationRiskPercentage1 41.80%us-gaap_ConcentrationRiskPercentage1
Significant Customers (Textual) [Abstract]    
Numbers of customers 2elon_NumberOfMajorCustomers 2elon_NumberOfMajorCustomers
Avnet [Member]    
Revenues attributable to sales [Line Items]    
Total 27.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= elon_EbvAvnetMember		 27.60%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= elon_EbvAvnetMember
Enel [Member]    
Revenues attributable to sales [Line Items]    
Total 8.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= elon_EnelMember		 14.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= elon_EnelMember