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Parent only financial information - Condensed statements of cash flows (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Condensed statements of cash flows        
Net cash used in operating activities ¥ (405,765) $ (58,833) ¥ (872,325) ¥ (368,046)
Net cash used in investing activities (283,530) (41,108) (1,391,361) (91,112)
Net cash provided by financing activities 537,767 77,969 2,192,792 1,138,126
Net increase (decrease) in cash and restricted cash (122,622) (17,778) (102,913) 668,945
Cash and restricted cash at the beginning of the year 900,963 130,627 1,003,876 334,931
Cash and restricted cash at the end of the year 778,341 $ 112,849 900,963 1,003,876
Parent company        
Condensed statements of cash flows        
Net cash used in operating activities (22,893)   (22,741) (266)
Net cash used in investing activities (734,299)   (3,121,321) (97,873)
Net cash provided by financing activities 729,767   3,222,206 206,422
Effect of foreign currency exchange rate changes on cash (12,308)   (17,660) (10,012)
Net increase (decrease) in cash and restricted cash (39,733)   60,484 98,271
Cash and restricted cash at the beginning of the year 158,755   98,271  
Cash and restricted cash at the end of the year ¥ 119,022   ¥ 158,755 ¥ 98,271