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Summary of Significant Accounting Policies Computation of Basic and Diluted Net loss per share (Tables)
 12 Months Ended
Dec. 31, 2014
Computation of Basic and Diluted net loss Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following is a reconciliation of the numerators and denominators of the basic and diluted net loss per share computations for the years ended December 31, 2014, 2013 and 2012 (in thousands, except per share amounts):
 
Year ended December 31,
 
2014
 
2013
 
2012
Net loss (Numerator):
 
 
 
 
 
Net loss from continuing operations attributable to Echelon Corporation Stockholders
$
(15,611
)
 
$
(14,739
)
 
$
(12,818
)
Net loss from discontinued operations attributable to Echelon Corporation Stockholders
(8,715
)
 
(2,871
)
 
—

Net loss attributable to Echelon Corporation Stockholders
$
(24,326
)
 
$
(17,610
)
 
$
(12,818
)
 
 
 
 
 
 
Shares (Denominator):
 
 
 
 
 
Weighted average common shares outstanding
43,502

 
43,092

 
42,650

Shares used in basic computation
43,502

 
43,092

 
42,650

Common shares issuable upon exercise of stock options (treasury stock method)
—

 
—

 
—

Shares used in diluted computation
43,502

 
43,092

 
42,650

 
 
 
 
 
 
Net loss per share:
 
 
 
 
 
Basic and diluted net loss per share from continuing operations attributable to Echelon Corporation Stockholders
$
(0.36
)
 
$
(0.34
)
 
$
(0.30
)
Basic and diluted net loss per share from discontinued operations attributable to Echelon Corporation Stockholders
$
(0.20
)
 
$
(0.07
)
 
$
0.00

Basic and diluted net loss per share attributable to Echelon Corporation Stockholders
$
(0.56
)
 
$
(0.41
)
 
$
(0.30
)

For the years ended December 31, 2014, 2013 and 2012, the diluted net loss per share calculation is equivalent to the basic net loss per share calculation as there were no potentially dilutive stock options or RSUs due to the Company’s net loss position. The number of stock options, stock appreciation rights, restricted stock units (“RSUs”), restricted stock awards (“RSAs”), and contingently issuable shares excluded from this calculation for the years ended December 31, 2014, 2013 and 2012 was 4,061,346, 5,472,946 and 5,868,929, respectively.