Summary of Significant Accounting Policies - Property and equipment, net (Details) |
Dec. 31, 2025 |
|---|---|
| Leasehold improvements | |
| Property and equipment, net | |
| Useful life | 3 years |
| Furniture, office and electric equipment | Minimum | |
| Property and equipment, net | |
| Useful life | 3 years |
| Furniture, office and electric equipment | Maximum | |
| Property and equipment, net | |
| Useful life | 5 years |
| Machinery and equipment | |
| Property and equipment, net | |
| Useful life | 10 years |
| Vehicles | Minimum | |
| Property and equipment, net | |
| Useful life | 5 years |
| Vehicles | Maximum | |
| Property and equipment, net | |
| Useful life | 10 years |
| Buildings | |
| Property and equipment, net | |
| Useful life | 20 years |