Condensed Consolidated Statements of Compehensive Loss (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Condensed Consolidated Statements of Comprehensive Loss [Abstract]
Net loss from continuing operations attributable to Echelon Corporation Stockholders	$ (1,424)	$ (2,560)
Net loss from discontinued operations, net of income taxes	0	(1,530)
Net loss	(1,424)	(4,090)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	(1,125)	(66)
Unrealized holding gain (loss) on available-for-sale securities	8	(1)
Total other comprehensive income (loss)	(1,117)	(67)
Comprehensive loss	(2,541)	(4,157)
Less: comprehensive loss attributable to noncontrolling interest	0	117
Comprehensive loss attributable to Echelon Corporation Stockholders	$ (2,541)	$ (4,040)