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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2019
Accounting Policies [Abstract]  
Disaggregation of revenue
The following table provides a disaggregation of product net sales for the periods presented (in thousands):
 
Three months ended
September 30,
 
Nine months ended
September 30,
 
2019
 
2018
 
2019
 
2018
Net sales:
 
 
 
 
 
 
 
Commercial
$
1,733

 
$
2,292

 
$
5,847

 
$
7,469

Military
1,182

 
2,866

 
3,327

 
7,520

Total net sales
$
2,915

 
$
5,158

 
$
9,174

 
$
14,989

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,
 
2019
 
2018
 
2019
 
2018
Numerator:
 
 
 
 
 
 
 
Net loss
$
(946
)
 
$
(1,920
)
 
$
(6,065
)
 
$
(6,114
)
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Basic weighted average common shares outstanding
12,370

 
12,059

 
12,278

 
11,970

Diluted weighted average shares
12,370

 
12,059

 
12,278

 
11,970


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,
 
2019
 
2018
 
2019
 
2018
Balance at beginning of period
$
342

 
$
196

 
$
258

 
$
174

Warranty accruals for current period sales
5

 
31

 
34

 
46

Adjustments to existing warranties

 
47

 
77

 
101

In kind settlements made during the period
(4
)
 
(14
)
 
(26
)
 
(61
)
Accrued warranty reserve
$
343

 
$
260

 
$
343

 
$
260