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Summary of Significant Accounting Policies Concentration of Credit Risk (Details)
Dec. 31, 2014
Dec. 31, 2013
Percentage of accounts receivable total 27.60%elon_PercentageOfAccountsReceivableTotal 22.90%elon_PercentageOfAccountsReceivableTotal
Enel [Member] [Member]    
Percentage of accounts receivable 3.60%elon_PercentageOfAccountsReceivable
/ us-gaap_MajorCustomersAxis
= elon_EnelMemberMember		 14.30%elon_PercentageOfAccountsReceivable
/ us-gaap_MajorCustomersAxis
= elon_EnelMemberMember
Ebv Avnet [Member]    
Percentage of accounts receivable 24.00%elon_PercentageOfAccountsReceivable
/ us-gaap_MajorCustomersAxis
= elon_AvnetMember		 8.60%elon_PercentageOfAccountsReceivable
/ us-gaap_MajorCustomersAxis
= elon_AvnetMember