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Parent company only condensed financial information - Cash Flows (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash generated from /(used in) operating activities      
Cash used in operations ¥ (271,334) ¥ (637,746) ¥ (720,786)
Net cash used in operating activities (276,849) (648,461) (745,984)
Cash flows from investing activities      
Net cash generated from investing activities 1,106,256 318,634 1,873,169
Cash flows from financing activities      
Proceeds from exercise of shares under share incentive scheme     1,161
Net cash used in financing activities (282,252) (213,605) (694,066)
Net increase/(decrease) in cash and cash equivalents 547,155 (543,432) 433,119
Cash and cash equivalents at the beginning of the year 1,379,473 1,907,776 1,399,370
Effects of exchange rate changes on cash and cash equivalents 21,294 15,129 75,287
Cash and cash equivalents at the end of year 1,947,922 1,379,473 1,907,776
Parent company      
Cash generated from /(used in) operating activities      
Cash used in operations (31,326) (44,284) (139,011)
Net cash used in operating activities (31,326) (44,284) (139,011)
Cash flows from investing activities      
Payment for interest in subsidiaries, net of cash acquired   (1,117,823) (3,005,546)
Proceeds from disposal of subsidiaries 839,087    
Proceeds/(Payments) from loan to subsidiaries (804,360) 1,157,947 3,218,655
Net cash generated from investing activities 34,727 40,124 213,109
Cash flows from financing activities      
Proceeds from exercise of shares under share incentive scheme     1,161
Payments for shares repurchase     (74,992)
Net cash used in financing activities     (73,831)
Net increase/(decrease) in cash and cash equivalents 3,401 (4,160) 267
Cash and cash equivalents at the beginning of the year 3,267 7,327 6,454
Effects of exchange rate changes on cash and cash equivalents 38 100 606
Cash and cash equivalents at the end of year ¥ 6,706 ¥ 3,267 ¥ 7,327