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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets | Our intangible assets consist of the following:
| December 31, |  |
| 2019 |  | 2018
| (in thousands) |  |
Intellectual property | $ | 700 |  |  | $ | 700 |
Less: Accumulated amortization | (428) |  |  | (194) |
Total, net | $ | 272 |  |  | $ | 506 |
Schedule of Amortization Expense | Amortization expense recorded in cost of sales is as follows:
| Years Ended December 31, |  |  |  |
| 2019 |  | 2018 |  | 2017
| (in thousands) |  |  |  |
Amortization expense | $ | 234 |  |  | $ | 194 |  |  | $ | — |

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