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Patents and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2022
Patents and Other Intangible Assets |
Schedule of Goodwill | Patents and other intangible assets are summarized as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(in thousands) |  | 2022 |  | 2021
Patents | ​ | ​ | ​ | ​ | ​ | ​
Patents pending | ​ | $ | 307 | ​ | $ | 439
Issued patents | ​ |  | 815 | ​ |  | 577
​ | ​ |  | 1,122 | ​ |  | 1,016
Trademarks | ​ |  | ​ | ​ |  | ​
Trademarks pending | ​ |  | 6 | ​ |  | 3
Registered trademarks | ​ |  | 95 | ​ |  | 94
​ | ​ |  | 101 | ​ |  | 97
Other | ​ |  | 8 | ​ |  | 8
​ | ​ |  | 1,231 | ​ |  | 1,121
Accumulated amortization | ​ |  | (433) | ​ |  | (322)
​ | ​ | $ | 798 | ​ | $ | 799
​
Schedule of future amortization expense | Future amortization expense associated with issued patents and registered trademarks as of December 31, 2022 is as follows: ​
​ | ​ | ​ | ​
(in thousands) | ​ | ​ | ​
2023 |  | $ | 147
2024 | ​ |  | 126
2025 | ​ |  | 96
2026 | ​ |  | 61
2027 | ​ |  | 39
Thereafter | ​ |  | 8
​ | ​ | $ | 477
​

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