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Parent only financial information - Condensed statements of cash flows (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Condensed statements of cash flows        
Net cash used in operating activities ¥ (1,243,406) $ (175,129) ¥ (461,337) ¥ (907,283)
Net cash used in investing activities 592,083 83,393 (313,039) (1,198,234)
Net cash provided by financing activities 296,826 41,808 657,767 2,122,792
Effect of foreign currency exchange rate changes on cash and restricted cash 41,342 5,821 28,906 (32,019)
Net decrease in cash and restricted cash (313,155) (44,107) (87,703) (14,744)
Cash and restricted cash at the beginning of the year 901,429 126,964 989,132 1,003,876
Cash and restricted cash at the end of the year 588,274 $ 82,857 901,429 989,132
Parent company        
Condensed statements of cash flows        
Net cash used in operating activities (43,242)   (22,893) (22,741)
Net cash used in investing activities (123,944)   (734,299) (3,121,321)
Net cash provided by financing activities 59,177   729,767 3,222,206
Effect of foreign currency exchange rate changes on cash and restricted cash 1,934   (12,308) (17,660)
Net decrease in cash and restricted cash (106,075)   (39,733) 60,484
Cash and restricted cash at the beginning of the year 119,022   158,755 98,271
Cash and restricted cash at the end of the year ¥ 12,947   ¥ 119,022 ¥ 158,755