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Intangible assets, net - Schedule and narrative (Details) - CNY (¥) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Intangible assets, net |  |  |  |
Intangible assets |  | ¥ 268,469,000 | ¥ 103,509,000 |
Less: accumulated amortization |  | (86,183,000) | (58,648,000) |
Impairment loss |  | (2,945,000) | 0 |
Intangible assets, net |  | ¥ 179,341,000 | 44,861,000 |
Software licensing agreement period | 3 years |  |  |
Amount of transaction | ¥ 50,000,000 |  |  |
Amortization period |  | 3 years |  |
Impairment loss |  | ¥ 2,945,000 | 0 | ¥ 0
Research and development expenses |  |  |  |
Intangible assets, net |  |  |  |
Impairment loss |  | 283,000 |  |
Selling, general and administrative expenses |  |  |  |
Intangible assets, net |  |  |  |
Impairment loss |  | 2,662,000 |  |
Software |  |  |  |
Intangible assets, net |  |  |  |
Intangible assets |  | 121,950,000 | 103,509,000 |
Software license rights |  |  |  |
Intangible assets, net |  |  |  |
Intangible assets |  | 143,725,000 | 0 |
Others |  |  |  |
Intangible assets, net |  |  |  |
Intangible assets |  | ¥ 2,794,000 | ¥ 0 |

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