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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
Summary of Significant Accounting Policies [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories consist of the following (in thousands):

 
December 31,
2015
 
December 31,
2014
 
 
 
 
Purchased materials
$
164

 
$
402

Finished goods
2,729

 
2,841

 
$
2,893

 
$
3,243
Schedule of Accrued Liabilities [Table Text Block]
Accrued liabilities consist of the following (in thousands):
 
December 31,
2015
 
December 31,
2014
 
 
 
 
Accrued payroll and related costs
$
2,119

 
$
1,463

Warranty reserve
120

 
143

Contingent consideration
318

 
—

Restructuring charges
—

 
701

Other accrued liabilities
328

 
537

 
$
2,885

 
$
2,844
Significant Accounts Receivable [Table Text Block]
As of December 31, 2015 and 2014, the percentage of the Company's total accounts receivable balance that were due from the following significant customers is as follows (refer to Note 9 - Significant Customers for a discussion of revenues generated from the Company's significant customers):
 
December 31,
 
2015
 
2014
Enel Distribuzione Spa
18.2%
 
3.6%
Avnet Europe Comm VA
12.9%
 
24.0%
Total
31.1%
 
27.6%
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, 2015, 2014 and 2013 (in thousands, except per share amounts):
 
Year ended December 31,
 
2015
 
2014
 
2013
Net loss (Numerator):
 
 
 
 
 
Net loss from continuing operations attributable to Echelon Corporation Stockholders
$
(13,233
)
 
$
(15,611
)
 
$
(14,739
)
Net loss from discontinued operations attributable to Echelon Corporation Stockholders
—

 
(8,715
)
 
(2,871
)
Net loss attributable to Echelon Corporation Stockholders
$
(13,233
)
 
$
(24,326
)
 
$
(17,610
)
 
 
 
 
 
 
Shares (Denominator):
 
 
 
 
 
Weighted average common shares outstanding
4,409

 
4,350

 
4,309

Shares used in basic computation
4,409

 
4,350

 
4,309

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

 
—

 
—

Shares used in diluted computation
4,409

 
4,350

 
4,309

 
 
 
 
 
 
Net loss per share:
 
 
 
 
 
Basic and diluted net loss per share from continuing operations attributable to Echelon Corporation Stockholders
$
(3.00
)
 
$
(3.59
)
 
$
(3.42
)
Basic and diluted net loss per share from discontinued operations attributable to Echelon Corporation Stockholders
$
0.00

 
$
(2.00
)
 
$
(0.67
)
Basic and diluted net loss per share attributable to Echelon Corporation Stockholders
$
(3.00
)
 
$
(5.59
)
 
$
(4.09
)

For the years ended December 31, 2015, 2014 and 2013, 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, 2015, 2014 and 2013 was 367,363, 406,134 and 547,294, respectively.