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Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets | Intangible assets consisted of the following:
(in thousands) | September 30, 2021 |  | December 31, 2020
Patents | $ | 431 |  |  | $ | 430 |
Less accumulated amortization | (206) |  |  | (172) |
| $ | 225 |  |  | $ | 258 |

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