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Property, Plant and Equipment | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Property, Plant and Equipment |  |
Property, Plant and Equipment | Note 4— Property, Plant and Equipment The following table summarizes our property, plant and equipment, net: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, |  | December 31,
​ | ​ | 2024 | ​ | 2023
Vehicles | ​ | $ | 354 | ​ | $ | 354
Buildings and improvements | ​ |  | 43 | ​ |  | 43
Computer equipment | ​ |  | 25 | ​ |  | 25
Furniture and fixtures | ​ |  | 3 | ​ |  | 3
Machinery and equipment | ​ |  | 1,404 | ​ |  | 1,404
Internal-use software | ​ |  | 3,698 | ​ |  | 3,126
Property, plant and equipment, gross | ​ | $ | 5,527 | ​ | $ | 4,955
Less: accumulated depreciation | ​ |  | (2,144) | ​ |  | (1,871)
Property, plant and equipment, net | ​ | $ | 3,383 | ​ | $ | 3,084
​ Depreciation expense was $273 and $180 for the three months ended March 31, 2024, and 2023, respectively. | Note 5 — Property, Plant and Equipment The following table summarizes our property, plant and equipment: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ | ​ | 2023 | ​ | 2022
Vehicles |  | $ | 354 |  | $ | 386
Buildings | ​ |  | 43 | ​ |  | 43
Computer equipment | ​ |  | 25 | ​ |  | 23
Furniture and fixtures | ​ |  | 3 | ​ |  | 3
Machinery and equipment | ​ |  | 1,404 | ​ |  | 1,140
Internal-use software | ​ |  | 3,126 | ​ |  | 1,851
Property, plant and equipment, gross | ​ | $ | 4,955 | ​ | $ | 3,446
Less: accumulated depreciation | ​ |  | (1,871) | ​ |  | (1,020)
Property, plant and equipment, net | ​ | $ | 3,084 | ​ | $ | 2,426
​ Depreciation expenses were $872 and $561 for the years ended December 31, 2023, and 2022, respectively.

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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//1943274/2147480321/958-360-50-6 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//1943274/2147480321/958-360-50-1 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//1943274/2147480321/958-360-50-7 + Details
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