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Patents and Other Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2025
Patents and Other Intangible Assets |
Schedule of Patents and Other Intangible Assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31, | ​
(in thousands) |  | 2025 |  | 2024 |
Patents | ​ | ​ | ​ | ​ | ​ | ​ | ​
Patents pending | ​ | $ | 377 | ​ | $ | 346 | ​
Issued patents | ​ |  | 1,056 | ​ |  | 1,034 | ​
​ | ​ |  | 1,433 | ​ |  | 1,380 | ​
Trademarks | ​ |  | ​ | ​ |  | ​ | ​
Registered trademarks | ​ |  | 86 | ​ |  | 86 | ​
​ | ​ |  | 86 | ​ |  | 86 | ​
Other | ​ |  | 8 | ​ |  | 8 | ​
​ | ​ |  | 1,527 | ​ |  | 1,474 | ​
Accumulated amortization | ​ |  | (729) | ​ |  | (644) | ​
​ | ​ | $ | 798 | ​ | $ | 830 | ​
Schedule of future amortization expense | ​
​ | ​ | ​ | ​
(in thousands) | ​ | ​ | ​
2025 (remaining) |  | $ | 75
2026 | ​ |  | 130
2027 | ​ |  | 106
2028 | ​ |  | 70
2029 | ​ |  | 30
Thereafter | ​ |  | 2
​ | ​ | $ | 413

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