Consolidated Statements of Compehensive Loss (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract]
Net income (loss)	$ (13,181)	$ (13,000)	$ (31,312)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	259	(302)	(500)
Unrealized holding gain (loss) on available-for-sale securities	6	(15)	15
Total other comprehensive income (loss)	265	(317)	(485)
Comprehensive loss	(12,916)	(13,317)	(31,797)
Less: comprehensive loss attributable to non controlling interest	(363)	0	0
Comprehensive loss attributable to Echelon Corporation Stockholders	$ (12,553)	$ (13,317)	$ (31,797)