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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2014
Accounting Policies [Abstract]  
Changes in warranty reserve
During the three and six months ended June 30, 2014 and 2013, changes in the warranty reserve consist of the following:

 
Three Months
 
Six Months
 
2014
 
2013
 
2014
 
2013
Accrued warranty reserve, beginning of period
$
833

 
$
453

 
$
638

 
$
549

Estimated warranty expense
84

 
147

 
467

 
255

Amounts charged against warranty reserve
(111
)
 
(103
)
 
(299
)
 
(307
)
Accrued warranty reserve, end of period
$
806

 
$
497

 
$
806

 
$
497
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 three and six months ended June 30, 2014 and 2013:
 
Three Months
 
Six Months
 
2014
 
2013
 
2014
 
2013
Numerator:
 
 
 
 
 
 
 
Basic and diluted loss per share – net loss
$
(2,289
)
 
$
(4,668
)
 
$
(4,214
)
 
$
(9,427
)
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Basic and diluted weighted average shares outstanding
21,940,284

 
12,993,514

 
21,935,097

 
12,824,927

 
 
 
 
 
 
 
 
Basic and diluted loss per share
$
(0.10
)
 
$
(0.36
)
 
$
(0.19
)
 
$
(0.74
)