Property and equipment, net - Additional information (Details) |
12 Months Ended | ||||
|---|---|---|---|---|---|
|
Dec. 31, 2025
CNY (¥)
|
Dec. 31, 2025
USD ($)
|
Dec. 31, 2024
CNY (¥)
|
Dec. 31, 2023
CNY (¥)
|
Dec. 31, 2025
USD ($)
|
|
| Property and equipment, net | |||||
| Depreciation expense | ¥ 50,000,000 | $ 7,000,000 | ¥ 21,000,000 | ¥ 14,000,000 | |
| Interest costs incurred and capitalized | 0 | 0 | 0 | 2,000,000 | |
| Property and equipment, gross | 1,777,398,351 | 1,641,782,323 | $ 254,164,584 | ||
| Property and equipment, net | 1,677,993,227 | 1,586,033,627 | 239,949,840 | ||
| Disposals | 3,582,671 | 512,315 | 816,244 | 2,817,196 | |
| Loss on disposal of property and equipment | 982,761 | 140,533 | 690,098 | ¥ 2,568,274 | |
| Aircraft | |||||
| Property and equipment, net | |||||
| Depreciation expense | 17,000,000 | 2,000,000 | 17,000,000 | ||
| Property and equipment, gross | 172,729,570 | 180,292,710 | 24,700,000 | ||
| Building | |||||
| Property and equipment, net | |||||
| Depreciation expense | 0 | ||||
| Property and equipment, gross | 1,570,548,470 | 118,266,537 | 224,585,444 | ||
| Property and equipment, gross | 1,452,000,000 | 208,000,000 | 118,000,000 | ||
| Building and Aircraft | |||||
| Property and equipment, net | |||||
| Depreciation expense | 31,000,000 | $ 4,000,000 | |||
| Property and equipment, net | ¥ 1,670,000,000 | ¥ 271,000,000 | $ 239,000,000 | ||