Financial Instruments (Details Textual)	Dec. 31, 2013
Financial Instruments (Textual) [Abstract]
Maximum remaining maturities period of investments included in cash equivalents	3
Short-term investments contractual maturity period minimum	4
Short-term investments contractual maturity period maximum	12
Average short-term investments maturity period	11

Maximum remaining maturities period of investments included in cash equivalents.

No definition available.

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Namespace Prefix:	elon_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant