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Prepayments and other receivables - Impairment loss Allowance (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Prepayments and other receivables      
Beginning of the year ¥ (5,719) ¥ (7,276) ¥ (2,968)
Exchange differences (1,041) 1,557 (4,308)
End of the year ¥ (6,760) ¥ (5,719) ¥ (7,276)