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PROPERTY, PLANT AND EQUIPMENT | 9 Months Ended
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Sep. 30, 2024
PROPERTY, PLANT AND EQUIPMENT |
PROPERTY, PLANT AND EQUIPMENT | 4. PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31,
(in thousands) |  | 2024 | ​ | 2023
Plant and equipment | ​ | $ | 1,662 | ​ | $ | 1,584
Furniture and fixtures | ​ |  | 113 | ​ |  | 108
Computer hardware and software | ​ |  | 104 | ​ |  | 24
​ | ​ |  | 1,879 | ​ |  | 1,716
Less: Accumulated depreciation | ​ |  | (1,526) | ​ |  | (1,261)
Property, plant and equipment, net | ​ | $ | 353 | ​ | $ | 455
​ | ​ | ​ | ​ | ​ | ​ | ​
​ Depreciation expense was $194.4 thousand and $121.7 thousand for the nine months ended September 30, 2024 and 2023, respectively and is classified as research and development expense.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-7 + Details
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