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Patents and Other Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2022
Patents and Other Intangible Assets |
Schedule of Patents and other intangible assets | Patents and other intangible assets are summarized as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31, | ​
(in thousands) |  | 2022 |  | 2021 |
Patents | ​ | ​ | ​ | ​ | ​ | ​ | ​
Patents pending | ​ | $ | 509 | ​ | $ | 439 | ​
Issued patents | ​ |  | 577 | ​ |  | 577 | ​
​ | ​ |  | 1,086 | ​ |  | 1,016 | ​
Trademarks | ​ |  | ​ | ​ |  | ​ | ​
Trademarks pending | ​ |  | 3 | ​ |  | 3 | ​
Registered trademarks | ​ |  | 96 | ​ |  | 94 | ​
​ | ​ |  | 99 | ​ |  | 97 | ​
Other | ​ |  | 8 | ​ |  | 8 | ​
​ | ​ |  | 1,193 | ​ |  | 1,121 | ​
Accumulated amortization | ​ |  | (381) | ​ |  | (322) | ​
​ | ​ | $ | 812 | ​ | $ | 799 | ​
​
Schedule of future amortization expense | Future amortization expense associated with issued patents and registered trademarks as of June 30, 2022 is as follows: ​
​ | ​ | ​ | ​
(in thousands) | ​ | ​ | ​
2022 (remaining 6 months) |  | $ | 59
2023 | ​ |  | 96
2024 | ​ |  | 74
2025 | ​ |  | 42
2026 | ​ |  | 9
Thereafter | ​ |  | 12
​ | ​ | $ | 292

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