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Cash and restricted cash - Reconciliation (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Cash and Cash Equivalents [Abstract]            
Cash at bank ¥ 324,036 $ 44,393 ¥ 571,760      
Restricted cash 43,416 5,948 27,126      
Cash and restricted cash shown in the consolidated statements of cash flows ¥ 367,452 $ 50,341 ¥ 598,886 $ 82,047 ¥ 901,429 ¥ 989,132