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Prepayments and other assets - Allowance for doubtful accounts (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2019
Prepayment and other assets      
Balance at the beginning of the year ¥ 31,694 ¥ 4,997  
Provision (Reversal) for the year/period (20,179) 26,697 ¥ 614
Write-off (3,871)   128
Balance at the end of the year/period ¥ 7,644 ¥ 31,694 ¥ 4,255