Taxation - Net operating tax loss carry forwards (Details) - CNY (¥) ¥ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2025 |
|
| Taxation | ||
| Loss expiring in 2026 | ¥ 175,107 | |
| Loss expiring in 2027 | 200,571 | |
| Loss expiring in 2028 | 437,989 | |
| Loss expiring after 2028 | 4,444,316 | |
| Total | ¥ 5,257,983 | |
| Minimum | ||
| Taxation | ||
| Expiration year for tax losses, term (in years) | 5 years | |
| Maximum | ||
| Taxation | ||
| Expiration year for tax losses, term (in years) | 10 years |