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PROPERTY, PLANT AND EQUIPMENT, NET | 12 Months Ended
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Dec. 31, 2024
PROPERTY, PLANT AND EQUIPMENT, NET |
PROPERTY, PLANT AND EQUIPMENT, NET | 6. PROPERTY, PLANT AND EQUIPMENT, NET The components of property, plant and equipment, net were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
​ |  | 2023 |  | 2024
Buildings | ​ | $ | 978,924 | ​ | $ | 967,761
Leasehold improvements | ​ |  | 44,275 | ​ | ​ | 188,780
Machinery and equipment | ​ |  | 2,213,281 | ​ | ​ | 2,497,250
Furniture, fixtures and office equipment | ​ |  | 178,455 | ​ | ​ | 192,081
Motor vehicles | ​ |  | 14,768 | ​ | ​ | 15,678
Freehold land | ​ | ​ | 45,397 | ​ | ​ | 56,234
Total costs | ​ |  | 3,475,100 | ​ | ​ | 3,917,784
Accumulated depreciation | ​ |  | (1,061,281) | ​ | ​ | (1,322,347)
Subtotal | ​ |  | 2,413,819 | ​ | ​ | 2,595,437
Construction in progress | ​ |  | 674,623 | ​ | ​ | 579,206
Property, plant and equipment, net | ​ | $ | 3,088,442 | ​ | $ | 3,174,643
​ Depreciation expense was $225,351, $287,130 and $462,254 for the years ended December 31, 2022, 2023 and 2024, respectively. Construction in progress primarily includes production facilities under construction and machinery and equipment pending installation.

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