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Patents and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2023
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) |  | 2023 |  | 2022
Patents | ​ | ​ | ​ | ​ | ​ | ​
Patents pending | ​ | $ | 477 | ​ | $ | 307
Issued patents | ​ |  | 810 | ​ |  | 815
​ | ​ |  | 1,287 | ​ |  | 1,122
Trademarks | ​ |  | ​ | ​ |  | ​
Trademarks pending | ​ |  | 4 | ​ |  | 6
Registered trademarks | ​ |  | 86 | ​ |  | 95
​ | ​ |  | 90 | ​ |  | 101
Other | ​ |  | 8 | ​ |  | 8
​ | ​ |  | 1,385 | ​ |  | 1,231
Accumulated amortization | ​ |  | (549) | ​ |  | (433)
​ | ​ | $ | 836 | ​ | $ | 798
​ Amortization expense for the years ended December 31, 2023 and 2022 totaled $147 thousand and $136 thousand, respectively. Future amortization expense associated with issued patents and registered trademarks as of December 31, 2023 is as follows: ​
​ | ​ | ​ | ​
(in thousands) | ​ | ​ | ​
2024 |  | $ | 129
2025 | ​ |  | 99
2026 | ​ |  | 66
2027 | ​ |  | 43
2028 | ​ |  | 7
Thereafter | ​ |  | 3
​ | ​ | $ | 347
​ 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, 2023 and 2022, the Company assessed its patent and trademark assets, and determined $14 thousand and $19 thousand impairment costs were incurred, respectively. 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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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350-30/tableOfContent + Details
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