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Restructuring Plan (Details Textual) (September 2014 Restructuring Plan [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
September 2014 Restructuring Plan [Member]
  
Number of Employees Reduced by Restructuring 44elon_NumberOfEmployeesReducedByRestructuring
/ us-gaap_RestructuringPlanAxis
= elon_September2014RestructuringPlanMember
Restructuring charges $ 0us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= elon_September2014RestructuringPlanMember