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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 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
June 30,
 
Six months ended
June 30,
 
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
Loss from continuing operations
$
(3,114
)
 
$
(3,916
)
 
$
(7,636
)
 
$
(5,893
)
Loss from discontinued operations
—

 
—

 
—

 
(12
)
Net loss
$
(3,114
)
 
$
(3,916
)
 
$
(7,636
)
 
$
(5,905
)
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Basic weighted average common shares outstanding
11,791

 
11,657

 
11,755

 
11,653

Potential common shares from equity awards and warrants
—

 
—

 
—

 
—

Diluted weighted average shares
11,791

 
11,657

 
11,755

 
11,653
Schedule of warranty activity
The following table summarizes warranty activity for the periods presented (in thousands):

 
Three months ended
June 30,
 
Six months ended
June 30,
 
2017
 
2016
 
2017
 
2016
Balance at beginning of period
$
258

 
$
327

 
$
331

 
$
314

Accruals for warranties issued
17

 
30

 
44

 
46

Adjustments to existing warranties
(17
)
 
(52
)
 
(66
)
 
(52
)
Settlements made during the period (in kind)
(79
)
 
(7
)
 
(130
)
 
(10
)
Accrued warranty reserve
$
179

 
$
298

 
$
179

 
$
298