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Basis of Financial Presentation and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]  
Changes in warranty reserve
During the years ended December 31, 2014, 2013 and 2012, changes in the warranty reserve consist of the following (in thousands):

 
2014
 
2013
 
2012
Accrued warranty reserve, beginning of period
$
638

 
$
549

 
$
537

Reserve provided
1,495

 
578

 
774

Payments
(605
)
 
(489
)
 
(762
)
Accrued warranty reserve, end of period
$
1,528

 
$
638

 
$
549
Reconciliation of net loss and weighted averages shares outstanding for the calculation of basic and diluted loss per share
The following table represents a reconciliation of the net loss and weighted average shares outstanding for the calculation of basic and diluted loss per share for the years ended December 31, 2014, 2013 and 2012 (in thousands):
 
For the Year Ended
 
2014
 
2013
 
2012
Numerator:
 
 
 
 
 
Basic and diluted loss per share – net loss
$
(1,932
)
 
$
(9,477
)
 
$
(90,235
)
Deemed dividend related to the beneficial conversion feature
—

 
(11,894
)
 
—

Loss attributable to common stockholders
$
(1,932
)
 
$
(21,371
)
 
$
(90,235
)
 
 
 
 
 
 
Denominator:
 
 
 
 
 
Basic and diluted weighted average shares outstanding
21,945,491

 
15,935,701

 
12,557,416