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Parent company only condensed financial information - Cash Flows (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash generated from /(used in) operating activities      
Cash used in operations ¥ (720,786) ¥ (383,704) ¥ (693,691)
Net cash used in operating activities (745,984) (404,334) (704,145)
Cash flows from investing activities      
Payment for interest in subsidiaries, net of cash acquired 0 (11,060) 0
Net cash generated from investing activities 1,873,169 388,435 1,315,725
Cash flows from financing activities      
Proceeds from exercise of shares under share incentive scheme 1,161 9,257  
Proceeds from issuance of ordinary shares     2,722,445
Share issue transaction costs     (24,766)
Net cash generated from/(used in) financing activities (694,066) (1,611,781) 1,533,838
Net (decrease)/increase in cash and cash equivalents 433,119 (1,627,680) 2,145,418
Cash and cash equivalents at the beginning of the year 1,399,370 3,055,194 1,077,875
Effects of exchange rate changes on cash and cash equivalents 75,287 (28,144) (168,099)
Cash and cash equivalents at the end of year 1,907,776 1,399,370 3,055,194
Parent company      
Cash generated from /(used in) operating activities      
Cash used in operations (139,011) (51,132) (5,230)
Net cash used in operating activities (139,011) (51,132) (5,230)
Cash flows from investing activities      
Payment for interest in subsidiaries, net of cash acquired (3,005,546) (1,333,804) (3,381,568)
Proceeds from loan to subsidiaries 3,218,655 1,350,654 85,694
Net cash generated from investing activities 213,109 16,850 (3,295,874)
Cash flows from financing activities      
Proceeds from exercise of shares under share incentive scheme 1,161 9,257  
Proceeds from issuance of ordinary shares     2,722,445
Proceeds from issuance of ordinary shares upon initial public offering (74,992)    
Share issue transaction costs     (24,766)
Net cash generated from/(used in) financing activities (73,831) 9,257 2,697,679
Net (decrease)/increase in cash and cash equivalents 267 (25,025) (603,425)
Cash and cash equivalents at the beginning of the year 6,454 31,857 634,507
Effects of exchange rate changes on cash and cash equivalents 606 (378) 775
Cash and cash equivalents at the end of year ¥ 7,327 ¥ 6,454 ¥ 31,857