Condensed Consolidated Balance Sheets Condensed Consolidated Balance Sheets (Parenthetical) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Condensed Consolidated Balance Sheet (Parenthetical) [Abstract]
Related Parties Account Receivable Current	$ 5.4	$ 1.6

Amount due from related parties within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

No definition available.

Name:	elon_RelatedPartiesAccountReceivableCurrent
Namespace Prefix:	elon_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant