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Patents and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2024
Patents and Other Intangible Assets |
Patents and Other Intangible Assets | Note 4 – Patents and Other Intangible Assets Patents and other intangible assets are summarized as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(in thousands) |  | 2024 |  | 2023
Patents | ​ | ​ | ​ | ​ | ​ | ​
Patents pending | ​ | $ | 346 | ​ | $ | 477
Issued patents | ​ |  | 1,034 | ​ |  | 810
​ | ​ |  | 1,380 | ​ |  | 1,287
Trademarks | ​ |  | ​ | ​ |  | ​
Trademarks pending | ​ |  | — | ​ |  | 4
Registered trademarks | ​ |  | 86 | ​ |  | 86
​ | ​ |  | 86 | ​ |  | 90
Other | ​ |  | 8 | ​ |  | 8
​ | ​ |  | 1,474 | ​ |  | 1,385
Accumulated amortization | ​ |  | (644) | ​ |  | (549)
​ | ​ | $ | 830 | ​ | $ | 836
​ Amortization expense for the years ended December 31, 2024 and 2023 totaled $165 thousand and $147 thousand, respectively. Future amortization expense associated with issued patents and registered trademarks as of December 31, 2024 is as follows: ​
​ | ​ | ​ | ​
(in thousands) | ​ | ​ | ​
2025 |  | $ | 157
2026 | ​ |  | 125
2027 | ​ |  | 102
2028 | ​ |  | 66
2029 | ​ |  | 25
Thereafter | ​ |  | 1
​ | ​ | $ | 476
​ The amortization life for patents ranges between three to five years, with trademark lives set at ten years. The Company does not amortize patents or trademarks classified as pending. ​ During the years ended December 31, 2024 and 2023, the Company assessed its patent and trademark assets, and recorded impairments of $20 thousand and $14 thousand, respectively. These impairment costs are included within research and development in the consolidated statements of operations and comprehensive loss. The Company also evaluated its strategic approach to the pursuit and protection of its intellectual property. It is the intent of the Company to continue to pursue intellectual property protection. If the Company identifies certain assets where the intellectual property does not directly align with its core technology, the Company will impair the intangible asset and write-off the asset as an expense.

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