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Patents and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2024
Patents and Other Intangible Assets |
Schedule of Patents and Other Intangible Assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(in thousands) |  | 2024 |  | 2023
Patents | ​ | ​ | ​ | ​ | ​ | ​
Patents pending | ​ | $ | 346 | ​ | $ | 477
Issued patents | ​ |  | 1,034 | ​ |  | 810
​ | ​ |  | 1,380 | ​ |  | 1,287
Trademarks | ​ |  | ​ | ​ |  | ​
Trademarks pending | ​ |  | — | ​ |  | 4
Registered trademarks | ​ |  | 86 | ​ |  | 86
​ | ​ |  | 86 | ​ |  | 90
Other | ​ |  | 8 | ​ |  | 8
​ | ​ |  | 1,474 | ​ |  | 1,385
Accumulated amortization | ​ |  | (644) | ​ |  | (549)
​ | ​ | $ | 830 | ​ | $ | 836
Schedule of future amortization expense | ​
​ | ​ | ​ | ​
(in thousands) | ​ | ​ | ​
2025 |  | $ | 157
2026 | ​ |  | 125
2027 | ​ |  | 102
2028 | ​ |  | 66
2029 | ​ |  | 25
Thereafter | ​ |  | 1
​ | ​ | $ | 476

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