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Patents and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2021
Patents and Other Intangible Assets |
Schedule of Patents and other intangible assets | Patents and other intangible assets are summarized as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(in thousands) |  | 2021 |  | 2020
​ | ​ | ​ | ​ | ​ | ​
Patents | ​ | ​ | ​ | ​ | ​ | ​
Patents pending | ​ | $ | 439 | ​ | $ | 731
Issued patents | ​ |  | 577 | ​ |  | 883
​ | ​ |  | 1,016 | ​ |  | 1,614
Trademarks | ​ |  | ​ | ​ |  | ​
Trademarks pending | ​ |  | 3 | ​ |  | 105
Registered trademarks | ​ |  | 94 | ​ |  | 23
​ | ​ |  | 97 | ​ |  | 128
Other | ​ |  | 8 | ​ |  | 8
​ | ​ |  | 1,121 | ​ |  | 1,750
Accumulated amortization | ​ |  | (322) | ​ |  | (448)
​ | ​ | $ | 799 | ​ | $ | 1,302
Schedule of future amortization expense | Future amortization expense associated with awarded patents and registered trademarks as of December 31, 2021 is as follows: ​
​ | ​ | ​ | ​
(in thousands) | ​ | ​ | ​
2022 |  | $ | 117
2023 | ​ |  | 96
2024 | ​ |  | 74
2025 | ​ |  | 42
2026 | ​ |  | 9
Thereafter | ​ |  | 11
​ | ​ | $ | 349

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