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Business Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2018
Business Segment Information |
Schedule of Geographic Net Sales Information |
|  | Year ended |
|  | December 31, |
Geographic net sales information (in thousands) |  | 2018 |  | 2017 |  | 2016 |
United States |  | $ | 151,677 |  | $ | 140,902 |  | $ | 104,995 |
International |  |  | 29,601 |  |  | 18,352 |  |  | 9,402 |
Total net sales |  | $ | 181,278 |  | $ | 159,254 |  | $ | 114,397 |
Schedule of Property and Equipment, net, Depreciation and Amortization, and Capital Expenditures by Geographic Area |
|  | Property and equipment, net |  | Depreciation and amortization |  | Capital expenditures |
|  | As of December 31, |  | Year ended December 31, |  | Year ended December 31, |
|  | 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016 |
United States |  | $ | 19,040 |  | $ | 11,677 |  | $ | 7,463 |  | $ | 6,234 |  | $ | 5,406 |  | $ | 4,654 |  | $ | 10,288 |  | $ | 6,051 |  | $ | 6,493 |
International |  |  | 113 |  |  | 117 |  |  | 130 |  |  | 30 |  |  | 76 |  |  | 68 |  |  | 27 |  |  | 221 |  |  | 56 |
Total |  | $ | 19,153 |  | $ | 11,794 |  | $ | 7,593 |  | $ | 6,264 |  | $ | 5,482 |  | $ | 4,722 |  | $ | 10,315 |  | $ | 6,272 |  | $ | 6,549 |

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