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Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2024
Intangible Assets |
Schedule of intangible assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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) | ​
​
Schedule of amortization expense for intangible assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30, |
​ |  | 2024 |  | 2023 | ​ | 2024 |  | 2023 |
Amortization expense | ​ | $ | 3 | ​ | $ | 3 | ​ | $ | 7 | ​ | $ | 8 | ​
​

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 + Details
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