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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2014
Accounting Policies [Abstract]  
Changes in warranty reserve
During the three and nine months ended September 30, 2014 and 2013, changes in the warranty reserve consisted of the following:

 
Three Months
 
Nine Months
 
2014
 
2013
 
2014
 
2013
Accrued warranty reserve, beginning of period
$
806

 
$
497

 
$
639

 
$
549

Reserve provided
467

 
161

 
933

 
376

Payments
(234
)
 
(202
)
 
(533
)
 
(469
)
Accrued warranty reserve, end of period
$
1,039

 
$
456

 
$
1,039

 
$
456
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 nine months ended September 30, 2014 and 2013:
 
Three Months
 
Nine Months
 
2014
 
2013
 
2014
 
2013
Numerator:
 
 
 
 
 
 
 
Basic and diluted income (loss) per share
$
678

 
$
(1,877
)
 
$
(3,537
)
 
$
(11,301
)
Deemed dividend related to the beneficial conversion feature
—

 
$
(11,894
)
 
—

 
$
(11,894
)
Income (loss) attributable to common stockholders
678

 
(13,771
)
 
(3,537
)
 
(23,195
)
Denominator:
 
 
 
 
 
 
 
Basic weighted average shares outstanding
21,953,484

 
16,097,335

 
21,941,293

 
13,927,716

Diluted weighted average shares outstanding
22,071,236

 
16,097,335

 
21,941,293

 
13,927,716

 
 
 
 
 
 
 
 
Basic income (loss) per share
$
0.03

 
$
(0.86
)
 
$
(0.16
)
 
$
(1.67
)
Diluted income (loss) per share
$
0.03

 
$
(0.86
)
 
$
(0.16
)
 
$
(1.67
)