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General information and basis of presentation - Schedule of financial statements amounts and balances of the Group's VIEs and subsidiaries of VIEs (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
General information, recapitalization and basis of presentation.      
Total current assets ¥ 6,374,276 ¥ 6,898,394  
Total non-current assets 2,508,106 2,442,213  
Total assets 8,882,382 9,340,607 ¥ 10,885,258
Total current liabilities 5,446,321 5,162,412  
Total non-current liabilities 158,006 343,113  
Total liabilities 5,604,327 5,505,525 5,599,975
Total revenue 4,357,462 4,098,037 3,309,113
Net loss (928,026) (1,330,513) (1,414,123)
Net cash (used in)/generated from operating activities (745,984) (404,334) (704,145)
Net cash generated from/(used in) investing activities 1,873,169 388,435 1,315,725
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
Cash and cash equivalents at the end of year ¥ 1,907,776 1,399,370 3,055,194
Shenzhen CA      
General information, recapitalization and basis of presentation.      
Proportion of ownership interest in subsidiary 98.90%    
VIEs      
General information, recapitalization and basis of presentation.      
Registered capital, capital reserve and PRC statutory reserves ¥ 1,774,000 1,753,000  
Total current assets 3,865,127 3,820,222  
Total non-current assets 906,455 996,872  
Total assets 4,771,582 4,817,094  
Total current liabilities 7,645,984 7,427,980  
Total non-current liabilities 27,902 97,509  
Total liabilities 7,673,886 7,525,489  
Total revenue 4,064,707 3,723,306 3,042,997
Net loss (195,819) (708,699) (989,704)
Net cash (used in)/generated from operating activities (618,574) (439,174) (443,276)
Net cash generated from/(used in) investing activities 918,498 3,633 1,660,300
Net cash generated from/(used in) financing activities 368,778 108,564 (887,374)
Net (decrease)/increase in cash and cash equivalents 668,702 (326,977) 329,650
Cash and cash equivalents at the beginning of the year 237,550 564,527 234,877
Cash and cash equivalents at the end of year ¥ 906,252 ¥ 237,550 ¥ 564,527
VIEs | Shenzhen CA      
General information, recapitalization and basis of presentation.      
Proportion of ownership interest in subsidiary 98.90% 98.90%