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Cash and restricted cash (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Cash and restricted cash            
Cash at bank ¥ 737,384 $ 106,911 ¥ 877,959      
Restricted cash 40,957 5,938 23,004      
Cash and restricted cash shown in the consolidated statements of cash flows ¥ 778,341 $ 112,849 ¥ 900,963 $ 130,627 ¥ 1,003,876 ¥ 334,931