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Property and Equipment, Net | 12 Months Ended
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Dec. 31, 2023
Property, Plant and Equipment [Abstract] |
Property and Equipment, Net | 6.PROPERTY AND EQUIPMENT, NET Property and equipment, as of December 31, 2022 and 2023 are as follows: ​
​ | ​ | ​ | ​ | ​
​ |  | As of December 31,
​ | ​ | 2022 | ​ | 2023
​ |  | RMB |  | RMB
Cost | ​ | ​ | ​ | ​
Land | ​ | — | ​ | 39,312
Electronic equipment |  | 79,663 |  | 114,237
Leasehold improvements |  | 63,995 |  | 67,677
Machinery and equipment |  | 121,614 |  | 186,890
Furniture and fixture |  | 54,851 |  | 78,169
Transportation vehicles |  | 4,411 |  | 5,400
Total cost |  | 324,534 |  | 491,685
Less: Accumulated depreciation |  | (84,329) |  | (154,473)
Property and equipment, net |  | 240,205 |  | 337,212
Construction in Progress |  | 264,748 |  | 534,399
Total |  | 504,953 |  | 871,611
​ Depreciation expenses were RMB21,187, RMB44,856 and RMB77,701 for the years ended December 31, 2021, 2022 and 2023, respectively. Construction in progress as of December 31, 2022 and 2023 mainly represents the Company’s new research and development and intelligent manufacturing center in Shanghai, PRC, which was ready for use since January 2024. In September 2023, the Group acquired an industrial raw land at a total cost of Thai baht189.4 million, equivalent to RMB39,312, covering a total area of 25,686 square meters in Chachoengsao Province, Thailand, for the construction of a new factory.

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