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Stock Based Compensation Expense Allocation (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized   $ 2,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition   1 year 1 month 6 days    
Allocated Share-based Compensation Expense, Net of Tax 1,197,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 2,538,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 6,976,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax  
Stock based compensation capitalized in Inventory   8,000elon_StockBasedCompensationCapitalizedInInventory 42,000elon_StockBasedCompensationCapitalizedInInventory  
Stock Based Compensation capitalized in Deferred COGS   2,000elon_StockBasedCompensationCapitalizedInDeferredCogs 8,000elon_StockBasedCompensationCapitalizedInDeferredCogs  
Cost of Product [Member]        
Allocated Share-based Compensation Expense           
Cost of Service [Member]        
Allocated Share-based Compensation Expense 292,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= elon_CostOfServiceMember
198,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= elon_CostOfServiceMember
678,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= elon_CostOfServiceMember
 
Product Development [Member]        
Allocated Share-based Compensation Expense (73,000)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= elon_ProductDevelopmentMember
156,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= elon_ProductDevelopmentMember
2,304,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= elon_ProductDevelopmentMember
 
Selling and Marketing Expense [Member]        
Allocated Share-based Compensation Expense 206,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingAndMarketingExpenseMember
84,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingAndMarketingExpenseMember
1,896,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingAndMarketingExpenseMember
 
General and Administrative Expense [Member]        
Allocated Share-based Compensation Expense 1,114,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
967,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
2,098,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
 
Discontinued Operations [Member]        
Allocated Share-based Compensation Expense (342,000)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SegmentDiscontinuedOperationsMember
1,133,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SegmentDiscontinuedOperationsMember
0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SegmentDiscontinuedOperationsMember
 
Total Share based compensation costs prior to tax benefit [Member]        
Allocated Share-based Compensation Expense 1,197,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= elon_TotalShareBasedCompensationCostsPriorToTaxBenefitMember
2,538,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= elon_TotalShareBasedCompensationCostsPriorToTaxBenefitMember
6,976,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= elon_TotalShareBasedCompensationCostsPriorToTaxBenefitMember
 
Tax benefit [Member]        
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation $ 0us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= elon_TaxBenefitMember
$ 0us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= elon_TaxBenefitMember
$ 0us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= elon_TaxBenefitMember