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Patents and Other Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2023
Patents and Other Intangible Assets |
Schedule of Patents and Other Intangible Assets | Patents and other intangible assets are summarized as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31, | ​
(in thousands) |  | 2023 |  | 2022 |
Patents | ​ | ​ | ​ | ​ | ​ | ​ | ​
Patents pending | ​ | $ | 330 | ​ | $ | 307 | ​
Issued patents | ​ |  | 815 | ​ |  | 815 | ​
​ | ​ |  | 1,145 | ​ |  | 1,122 | ​
Trademarks | ​ |  | ​ | ​ |  | ​ | ​
Trademarks pending | ​ |  | 7 | ​ |  | 6 | ​
Registered trademarks | ​ |  | 95 | ​ |  | 95 | ​
​ | ​ |  | 102 | ​ |  | 101 | ​
Other | ​ |  | 8 | ​ |  | 8 | ​
​ | ​ |  | 1,255 | ​ |  | 1,231 | ​
Accumulated amortization | ​ |  | (473) | ​ |  | (433) | ​
​ | ​ | $ | 782 | ​ | $ | 798 | ​
​
Schedule of future amortization expense | Future amortization expense associated with issued patents and registered trademarks as of March 31, 2023 is as follows: ​
​ | ​ | ​ | ​
(in thousands) | ​ | ​ | ​
2023 |  | $ | 108
2024 | ​ |  | 126
2025 | ​ |  | 96
2026 | ​ |  | 61
2027 | ​ |  | 39
Thereafter | ​ |  | 7
​ | ​ | $ | 437
​

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