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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 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
March 31,
 
2017
 
2016
Numerator:
 
 
 
Loss from continuing operations
$
(4,522
)
 
$
(1,977
)
Loss from discontinued operations
—

 
(12
)
Net loss
$
(4,522
)
 
$
(1,989
)
 
 
 
 
Denominator:
 
 
 
Basic weighted average common shares outstanding
11,718

 
11,650

Potential common shares from equity awards and warrants
—

 
—

Diluted weighted average shares
11,718

 
11,650
Schedule of warranty activity
The following table summarizes warranty activity for the periods presented (in thousands):

 
Three months ended
March 31,
 
2017
 
2016
Balance at beginning of period
$
331

 
$
314

Accruals for warranties issued
13

 
16

Adjustments to existing warranties
(50
)
 
—

Settlements made during the period (in kind)
(36
)
 
(3
)
Accrued warranty reserve
$
258

 
$
327