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Patents and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2024
Patents and Other Intangible Assets |
Schedule of Patents and Other Intangible Assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31,
(in thousands) |  | 2024 |  | 2023
Patents | ​ | ​ | ​ | ​ | ​ | ​
Patents pending | ​ | $ | 351 | ​ | $ | 477
Issued patents | ​ |  | 1,011 | ​ |  | 810
​ | ​ |  | 1,362 | ​ |  | 1,287
Trademarks | ​ |  | ​ | ​ |  | ​
Trademarks pending | ​ |  | — | ​ |  | 4
Registered trademarks | ​ |  | 86 | ​ |  | 86
​ | ​ |  | 86 | ​ |  | 90
Other | ​ |  | 8 | ​ |  | 8
​ | ​ |  | 1,456 | ​ |  | 1,385
Accumulated amortization | ​ |  | (601) | ​ |  | (549)
​ | ​ | $ | 855 | ​ | $ | 836
Schedule of future amortization expense | ​
​ | ​ | ​ | ​
(in thousands) | ​ | ​ | ​
2024 (remaining 3 months) |  | $ | 41
2025 | ​ |  | 151
2026 | ​ |  | 121
2027 | ​ |  | 98
2028 | ​ |  | 62
Thereafter | ​ |  | 23
​ | ​ | $ | 496

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