Land use right - Additional Information (Details) - Land [Member] - Mainland Of China [Member] |
12 Months Ended |
|---|---|
Dec. 31, 2024 | |
| Bottom of range [Member] | |
| Disclosure Of Quantitative Information About Land Use Right [Line Items] | |
| Remaining lease period | 30 years |
| Top of range [Member] | |
| Disclosure Of Quantitative Information About Land Use Right [Line Items] | |
| Remaining lease period | 40 years |