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Parent only financial information - Condensed statements of cash flows (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
CNY (¥)
Condensed statements of cash flows        
Net cash used in operating activities ¥ (430,279) $ (58,947) ¥ (1,232,952) ¥ (461,337)
Net cash (used in)/provided by investing activities (59,905) (8,208) 592,083 (313,039)
Net cash provided by/(used in) financing activities 261,639 35,845 296,826 657,767
Effect of foreign currency exchange rate changes on cash and restricted cash (2,889) (396) 41,500 28,906
Net decrease in cash and restricted cash (231,434) (31,706) (302,543) (87,703)
Cash and restricted cash at the beginning of the period 598,886 82,047 901,429 989,132
Cash and restricted cash at the end of the period 367,452 $ 50,341 598,886 901,429
Parent company        
Condensed statements of cash flows        
Net cash used in operating activities (46,203)   (43,242) (22,893)
Net cash (used in)/provided by investing activities 59,022   (123,944) (734,299)
Net cash provided by/(used in) financing activities (21,898)   59,177 729,767
Effect of foreign currency exchange rate changes on cash and restricted cash 237   1,934 (12,308)
Net decrease in cash and restricted cash (8,842)   (106,075) (39,733)
Cash and restricted cash at the beginning of the period 12,947   119,022 158,755
Cash and restricted cash at the end of the period ¥ 4,105   ¥ 12,947 ¥ 119,022