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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2017
Accounting Policies [Abstract]  
Reconciliation of basic and diluted income (loss) per share
The following is a reconciliation of the numerator and denominator of the basic and diluted net loss per share computations for the periods presented below (in thousands):

 
Three months ended
September 30,
 
Nine months ended
September 30,
 
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
Loss from continuing operations
$
(1,773
)
 
$
(3,177
)
 
$
(9,409
)
 
$
(9,070
)
Loss from discontinued operations
—

 
—

 
—

 
(12
)
Net loss
$
(1,773
)
 
$
(3,177
)
 
$
(9,409
)
 
$
(9,082
)
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Basic weighted average common shares outstanding
11,856

 
11,690

 
11,789

 
11,666

Potential common shares from equity awards and warrants
—

 
—

 
—

 
—

Diluted weighted average shares
11,856

 
11,690

 
11,789

 
11,666
Schedule of warranty activity
The following table summarizes warranty activity for the periods presented (in thousands):

 
Three months ended
September 30,
 
Nine months ended
September 30,
 
2017
 
2016
 
2017
 
2016
Balance at beginning of period
$
179

 
$
298

 
$
331

 
$
314

Warranty accruals for current period sales
18

 
65

 
152

 
111

Adjustments to existing warranties
30

 
(60
)
 
(36
)
 
(112
)
In kind settlements made during the period
(40
)
 
(8
)
 
(260
)
 
(18
)
Accrued warranty reserve
$
187

 
$
295

 
$
187

 
$
295