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Stock Based Compensation Equity Compensation expense for RSUs and RSAs with Financial or other Performance based vesting requirments (Details) (USD $)
12 Months Ended 23 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2012
Sep. 30, 2014
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted   700,800us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted      
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Recognized Share Based Awards Other than Options $ 324,000elon_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostRecognizedShareBasedAwardsOtherThanOptions        
Fair Value of Performance Awards on Grant Date 2,277,000elon_FairValueOfPerformanceAwardsOnGrantDate        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 1,953,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions        
Latest Date that Performance condition could be met           
Aug 2010 Grant Date [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted   80,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
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Employee Service Share Based Compensation Nonvested Awards Compensation Cost Recognized Share Based Awards Other than Options 0elon_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostRecognizedShareBasedAwardsOtherThanOptions
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= elon_GrantDate1Member
       
Fair Value of Performance Awards on Grant Date 596,000elon_FairValueOfPerformanceAwardsOnGrantDate
/ elon_GrantDateOfAwardAxis
= elon_GrantDate1Member
       
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 596,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
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= elon_GrantDate1Member
       
Latest Date that Performance condition could be met April 2015        
November 2011 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted   50,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
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= elon_GrantDate4Member
     
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Recognized Share Based Awards Other than Options 0elon_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostRecognizedShareBasedAwardsOtherThanOptions
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= elon_GrantDate4Member
       
Fair Value of Performance Awards on Grant Date 277,000elon_FairValueOfPerformanceAwardsOnGrantDate
/ elon_GrantDateOfAwardAxis
= elon_GrantDate4Member
       
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 277,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ elon_GrantDateOfAwardAxis
= elon_GrantDate4Member
       
Latest Date that Performance condition could be met April 2015        
August 2010 and November 2011 Grant Date [Member]          
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Recognized Share Based Awards Other than Options     264,000elon_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostRecognizedShareBasedAwardsOtherThanOptions
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= elon_GrantDate7MemberMember
   
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Reversed Share Based Awards Other than Options   264,000elon_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostReversedShareBasedAwardsOtherthanOptions
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= elon_GrantDate7MemberMember
     
Number of non-vested equity-based payment instruments with performance condition excluding stock (or unit) options   130,000elon_NumberOfNonVestedEquityBasedPaymentInstrumentsWithPerformanceConditionExcludingStockOrUnitOptions
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= elon_GrantDate7MemberMember
     
June 2014 Grant Date [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 570,800us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
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= elon_GrantDate6MemberMember
       
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Recognized Share Based Awards Other than Options 324,000elon_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostRecognizedShareBasedAwardsOtherThanOptions
/ elon_GrantDateOfAwardAxis
= elon_GrantDate6MemberMember
       
Fair Value of Performance Awards on Grant Date 1,404,000elon_FairValueOfPerformanceAwardsOnGrantDate
/ elon_GrantDateOfAwardAxis
= elon_GrantDate6MemberMember
    743,000elon_FairValueOfPerformanceAwardsOnGrantDate
/ elon_GrantDateOfAwardAxis
= elon_GrantDate6MemberMember
2,345,000elon_FairValueOfPerformanceAwardsOnGrantDate
/ elon_GrantDateOfAwardAxis
= elon_GrantDate6MemberMember
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 1,080,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ elon_GrantDateOfAwardAxis
= elon_GrantDate6MemberMember
       
Latest Date that Performance condition could be met December 2014        
Number of non-vested equity-based payment instruments with performance condition excluding stock (or unit) options 80,500elon_NumberOfNonVestedEquityBasedPaymentInstrumentsWithPerformanceConditionExcludingStockOrUnitOptions
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= elon_GrantDate6MemberMember
    302,000elon_NumberOfNonVestedEquityBasedPaymentInstrumentsWithPerformanceConditionExcludingStockOrUnitOptions
/ elon_GrantDateOfAwardAxis
= elon_GrantDate6MemberMember
953,300elon_NumberOfNonVestedEquityBasedPaymentInstrumentsWithPerformanceConditionExcludingStockOrUnitOptions
/ elon_GrantDateOfAwardAxis
= elon_GrantDate6MemberMember
Fair Value of Performance Awards on Grant Date for employees who terminated 198,000elon_FairValueofPerformanceAwardsonGrantDateforemployeeswhoterminated
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= elon_GrantDate6MemberMember
       
Grant date fair value of awards that will not vest $ 1,000,000elon_Grantdatefairvalueofawardsthatwillnotvest
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