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Financial Instruments (Details Textual)
Dec. 31, 2014
Financial Instruments (Textual) [Abstract]  
Short-term investments contractual maturity period minimum 8elon_ShortTermInvestmentsContractualMaturityPeriodMinimum
Short-term investments contractual maturity period maximum 12elon_ShortTermInvestmentsContractualMaturityPeriodMaximum
Average short-term investments maturity period 7elon_AverageShortTermInvestmentsMaturityPeriod