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Patents and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2022
Patents and Other Intangible Assets |
Schedule of Patents and Other Intangible Assets | Patents and other intangible assets are summarized as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31, | ​
(in thousands) |  | 2022 |  | 2021 |
Patents | ​ | ​ | ​ | ​ | ​ | ​ | ​
Patents pending | ​ | $ | 364 | ​ | $ | 439 | ​
Issued patents | ​ |  | 761 | ​ |  | 577 | ​
​ | ​ |  | 1,125 | ​ |  | 1,016 | ​
Trademarks | ​ |  | ​ | ​ |  | ​ | ​
Trademarks pending | ​ |  | 6 | ​ |  | 3 | ​
Registered trademarks | ​ |  | 95 | ​ |  | 94 | ​
​ | ​ |  | 101 | ​ |  | 97 | ​
Other | ​ |  | 8 | ​ |  | 8 | ​
​ | ​ |  | 1,234 | ​ |  | 1,121 | ​
Accumulated amortization | ​ |  | (416) | ​ |  | (322) | ​
​ | ​ | $ | 818 | ​ | $ | 799 | ​
​
Schedule of future amortization expense | Future amortization expense associated with issued patents and registered trademarks as of September 30, 2022 is as follows: ​
​ | ​ | ​ | ​
(in thousands) | ​ | ​ | ​
2022 (remaining 3 months) |  | $ | 38
2023 | ​ |  | 133
2024 | ​ |  | 111
2025 | ​ |  | 79
2026 | ​ |  | 45
Thereafter | ​ |  | 34
​ | ​ | $ | 440

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