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Income taxes - Net operating loss carryforwards (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Other than PRC |  |
Net operating loss carryforwards |  |
Total | ¥ 302,595 | ¥ 87,051
PRC |  |
Net operating loss carryforwards |  |
2026 | 7,450 |
2027 | 145,626 |
2028 | 112,976 |
2031 | 668 |
2032 | 571,961 |
2033 | 601,622 |
Total | ¥ 1,440,303 |

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