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Patents and Other Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2023
Patents and Other Intangible Assets |
Schedule of Patents and Other Intangible Assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31, | ​
(in thousands) |  | 2023 |  | 2022 |
Patents | ​ | ​ | ​ | ​ | ​ | ​ | ​
Patents pending | ​ | $ | 360 | ​ | $ | 307 | ​
Issued patents | ​ |  | 782 | ​ |  | 815 | ​
​ | ​ |  | 1,142 | ​ |  | 1,122 | ​
Trademarks | ​ |  | ​ | ​ |  | ​ | ​
Trademarks pending | ​ |  | 4 | ​ |  | 6 | ​
Registered trademarks | ​ |  | 86 | ​ |  | 95 | ​
​ | ​ |  | 90 | ​ |  | 101 | ​
Other | ​ |  | 8 | ​ |  | 8 | ​
​ | ​ |  | 1,240 | ​ |  | 1,231 | ​
Accumulated amortization | ​ |  | (478) | ​ |  | (433) | ​
​ | ​ | $ | 762 | ​ | $ | 798 | ​
Schedule of future amortization expense | ​
​ | ​ | ​ | ​
(in thousands) | ​ | ​ | ​
2023 (remaining 6 months) |  | $ | 67
2024 | ​ |  | 125
2025 | ​ |  | 94
2026 | ​ |  | 60
2027 | ​ |  | 38
Thereafter | ​ |  | 6
​ | ​ | $ | 390

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