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Property and equipment, net | 12 Months Ended
--- | ---
Dec. 31, 2024
Property and equipment, net |
Property and equipment, net | 9. Property and equipment, net ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ | ​ | 2023 | ​ | 2024
​ |  | RMB |  | RMB |  | US$
Construction in progress | ​ | 1,134,688,427 | ​ | 1,302,148,272 | ​ | 178,393,582
Leasehold improvements |  | 13,615,929 | ​ | 15,967,920 | ​ | 2,187,596
Office and electronic equipment |  | 7,774,324 | ​ | 11,704,829 | ​ | 1,603,555
Motor vehicles |  | 13,313,052 | ​ | 13,402,055 | ​ | 1,836,074
Aircraft | ​ | 175,367,530 | ​ | 180,292,710 | ​ | 24,700,000
Buildings | ​ | — | ​ | 118,266,537 | ​ | 16,202,449
Property and equipment, gross |  | 1,344,759,262 | ​ | 1,641,782,323 | ​ | 224,923,256
Less accumulated depreciation |  | 35,527,263 | ​ | 54,915,306 | ​ | 7,523,366
Less impairment |  | 894,274 | ​ | 833,390 | ​ | 114,174
Property and equipment, net |  | 1,308,337,725 | ​ | 1,586,033,627 | ​ | 217,285,716
​ Depreciation expense, for the years ended December 31, 2022, 2023 and 2024, was RMB 6 million, RMB 14 million and RMB 21 million (US$ 3 million), respectively. For the years ended December 31, 2022, 2023 and 2024, the interest cost incurred and capitalized was RMB 7 million, RMB 2 million and RMB nil (US$ nil), respectively. In 2024 and 2023, the Company capitalized buildings and acquired aircraft at a cost of RMB 118 million (US$ 16 million) and RMB 175 million, respectively, to support its business expansion initiatives. In 2023, the depreciation expense for the aircraft amounted to RMB 9 million. In 2024, the depreciation expense for the aircraft was RMB 17 million (US$ 2 million), while no depreciation expenses were recorded for the buildings as they were capitalized in December 2024. As of December 31, 2024, the net value of the aircraft and buildings was RMB 271 million (US$ 37 million). For the years ended December 31, 2022, 2023 and 2024, the carrying amounts of the disposed property and equipment were RMB 9,611,937, RMB 2,817,196 and RMB 816,244 (US$ 111,825), respectively. The loss from disposal of property and equipment was RMB 8,227,046, RMB 2,568,274 and RMB 690,098 (US$ 94,543) for the years ended December 31, 2022, 2023 and 2024, 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/1943274/2147477798/958-360-50-6 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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