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Basis of Financial Statement Presentation and Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2015
Accounting Policies [Abstract]  
Changes in warranty reserve
During the three and six months ended June 30, 2015 and 2014, changes in the warranty reserve consisted of the following (in thousands):

 
Three Months
 
Six Months
 
2015
 
2014
 
2015
 
2014
Accrued warranty reserve, beginning of period
$
1,511

 
$
833

 
$
1,528

 
$
638

Reserve provided
764

 
84

 
1,136

 
467

Payments
(508
)
 
(111
)
 
(897
)
 
(299
)
Accrued warranty reserve, end of period
$
1,767

 
$
806

 
$
1,767

 
$
806
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, 2015 and 2014 (in thousands, except share data):
 
Three Months
 
Six Months
 
2015
 
2014
 
2015
 
2014
Numerator:
 
 
 
 
 
 
 
Basic and diluted net loss
$
(4,466
)
 
$
(2,289
)
 
$
(9,474
)
 
$
(4,214
)
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Basic and diluted weighted average shares outstanding
22,005,589

 
21,940,284

 
22,000,367

 
21,935,097

 
 
 
 
 
 
 
 
Basic and diluted loss per share
$
(0.20
)
 
$
(0.10
)
 
$
(0.43
)
 
$
(0.19
)