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Intangible Assets | 6 Months Ended
--- | ---
Jun. 30, 2024
Intangible Assets |
Intangible Assets | Note 4 – Intangible Assets Intangible assets of the Company are summarized as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, 2024 |  | December 31, 2023 | ​
​ | ​ | Gross Carrying | ​ | Accumulated | ​ | Gross Carrying | ​ | Accumulated | ​
​ |  | Amount |  | Amortization |  | Amount |  | Amortization | ​
Intangible assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Licenses | ​ | $ | 149 | ​ | $ | (65) | ​ | $ | 149 | ​ | $ | (61) | ​
Patents | ​ | ​ | 130 | ​ | ​ | (8) | ​ | ​ | 92 | ​ | ​ | (5) | ​
Patents pending |  | ​ | 1,671 |  | ​ | ​ |  | ​ | 1,444 |  | ​ | — | ​
Trademarks | ​ | ​ | 13 | ​ | ​ | ​ | ​ | ​ | 13 | ​ | ​ | — | ​
Trademarks pending |  | ​ | 22 |  | ​ | ​ |  | ​ | 18 |  | ​ | — | ​
Total amortized intangible assets | ​ | $ | 1,985 | ​ | $ | (73) | ​ | $ | 1,716 | ​ | $ | (66) | ​
​ ​ Amortization expense for intangible assets is summarized as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30, |
​ |  | 2024 |  | 2023 | ​ | 2024 |  | 2023 |
Amortization expense | ​ | $ | 3 | ​ | $ | 3 | ​ | $ | 7 | ​ | $ | 8 | ​
​ Useful lives of intangible assets range from three to 20 years. Amortization expenses are allocated ratably across Operating Expenses based on Company personnel costs incurred.

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