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PROPERTY, PLANT AND EQUIPMENT, NET | 12 Months Ended
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Dec. 31, 2023
PROPERTY, PLANT AND EQUIPMENT, NET |
PROPERTY, PLANT AND EQUIPMENT, NET | 6. PROPERTY, PLANT AND EQUIPMENT, NET Property, plant and equipment, net consist of the following: ​
​ | ​ | ​ | ​ | ​
​ | ​ | At December 31, | ​ | At December 31,
​ |  | 2022 |  | 2023
​ | ​ | $ | ​ | $
Buildings |  | 764,577 | ​ | 978,924
Leasehold improvements |  | 30,896 | ​ | 44,275
Machinery |  | 1,470,957 | ​ | 2,213,281
Furniture, fixtures and equipment |  | 58,928 | ​ | 178,455
Motor vehicles |  | 11,527 | ​ | 14,768
Freehold land | ​ | 39,285 | ​ | 45,397
​ |  | 2,376,170 | ​ | 3,475,100
Accumulated depreciation |  | (908,888) | ​ | (1,061,281)
Subtotal |  | 1,467,282 | ​ | 2,413,819
Construction in progress |  | 359,361 | ​ | 674,623
Property, plant and equipment, net |  | 1,826,643 | ​ | 3,088,442
​ Depreciation expense of property, plant and equipment was $266,956, $225,351 and $287,130 for the years ended December 31, 2021, 2022 and 2023, respectively. Construction in progress primarily represents production facilities under construction and the machinery under installation.

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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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