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Commitments and Contingencies Line of Credit (Details) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Commitments and Contingencies [Abstract]      
Line of Credit Maintained $ 5,000,000elon_LineOfCreditMaintained $ 1,000,000elon_LineOfCreditMaintained  
Collateral required - old line of credit 6,300,000elon_Collateralrequiredoldlineofcredit    
Number of Letter of Credit   1elon_NumberOfLetterOfCredit  
Letters of Credit Outstanding, Amount   113,000us-gaap_LettersOfCreditOutstandingAmount  
Restricted Investments, Current   $ 1,401,000us-gaap_RestrictedInvestmentsCurrent $ 0us-gaap_RestrictedInvestmentsCurrent