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Customers' refundable fees (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Movement In Customers Refundable Fees      
Balance at the beginning of the year ¥ 30,997 ¥ 36,074 ¥ 44,916
Cash received from customers 42,298 43,527 55,403
Cash refunded to customers (46,554) (35,374) (26,329)
Revenue (recognized) reversed 4,006 (13,230) (37,916)
Balance at the end of the year ¥ 30,747 ¥ 30,997 ¥ 36,074