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Cash and restricted cash - Reconciliation (Details)
¥ in Thousands, $ in Thousands
Jun. 30, 2024
CNY (¥)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Jun. 30, 2023
CNY (¥)
Dec. 31, 2022
CNY (¥)
Cash and Cash Equivalents [Abstract]            
Cash at banks ¥ 787,639 $ 108,383 ¥ 571,760      
Restricted cash 159 22 27,126      
Cash and restricted cash shown in the unaudited condensed consolidated statements of cash flows ¥ 787,798 $ 108,405 ¥ 598,886 $ 82,409 ¥ 927,782 ¥ 901,429