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Product and Geographic Information (Tables)
12 Months Ended
Dec. 31, 2018
Segment Reporting [Abstract]  
Breakdown of Product Net Sales
The following table provides a breakdown of product net sales from continuing operations for the years indicated (in thousands):
 
 
Year ended December 31,
 
2018
 
2017
 
2016
 
 
 
 
 
 
Commercial
$
8,662

 
$
15,217

 
$
14,809

Military maritime
9,445

 
4,629

 
16,189

Total net sales
$
18,107

 
$
19,846

 
$
30,998

Geographic Summary of Net Sales
A geographic summary of net sales from continuing operations is as follows (in thousands):
  
 
For the year ended December 31,
 
2018
 
2017
 
2016
 
 
 
 
 
 
United States
$
17,736

 
$
19,446

 
$
29,840

International
371

 
400

 
1,158

Total net sales
$
18,107

 
$
19,846

 
$
30,998