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Product and Geographic Information (Tables) | 12 Months Ended
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Dec. 31, 2017
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,
| 2017 |  | 2016 |  | 2015
Commercial | $ | 15,217 |  |  | $ | 14,809 |  |  | $ | 14,156 |
Military maritime | 4,629 |  |  | 16,189 |  |  | 50,128 |
R&D services | — |  |  | — |  |  | 119 |
Total net sales | $ | 19,846 |  |  | $ | 30,998 |  |  | $ | 64,403 |
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,
| 2017 |  | 2016 |  | 2015
United States | $ | 19,446 |  |  | $ | 29,840 |  |  | $ | 64,251 |
International | 400 |  |  | 1,158 |  |  | 152 |
Total net sales | $ | 19,846 |  |  | $ | 30,998 |  |  | $ | 64,403 |

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