Condensed Consolidated Statements of Compehensive Loss (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Condensed Consolidated Statements of Comprehensive Loss [Abstract]
Net loss	$ (4,090)	$ (9,395)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	(66)	(446)
Unrealized holding gain (loss) on available-for-sale securities	(1)	0
Total other comprehensive income (loss)	(67)	(446)
Comprehensive loss	(4,157)	(9,841)
Less: comprehensive loss attributable to noncontrolling interest	117	148
Comprehensive loss attributable to Echelon Corporation Stockholders	$ (4,040)	$ (9,693)