Material accounting policies - Property, leasehold improvements and equipment, net (Details) |
12 Months Ended |
|---|---|
Dec. 31, 2025 | |
| Improvement in leased assets | |
| Property, leasehold improvements and equipment, net | |
| Useful Life (years) | 20 years |
| Machinery and equipment | |
| Property, leasehold improvements and equipment, net | |
| Useful Life (years) | 10 years |
| Furniture and office equipment | |
| Property, leasehold improvements and equipment, net | |
| Useful Life (years) | 10 years |
| Transportation equipment | |
| Property, leasehold improvements and equipment, net | |
| Useful Life (years) | 4 years |
| Computer equipment | |
| Property, leasehold improvements and equipment, net | |
| Useful Life (years) | 3 years 3 months 18 days |