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Prepayments and other receivables - Impairment loss Allowance (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Prepayments and other receivables      
Beginning of the year ¥ (2,968) ¥ (3,349) ¥ (1,332)
(Additions)/Reversals (4,308) 2 (2,569)
Write-off   365 536
Exchange differences   14 16
End of the year ¥ (7,276) ¥ (2,968) ¥ (3,349)