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Income tax benefit/ (expense) - Tax on the Group's loss before income tax differs from the theoretical amount statutory tax rate applicable to loss of the consolidated entities (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income tax benefit/(expense)        
Statutory income tax rate (as a percent)   25.00% 25.00% 25.00%
Loss before income tax ¥ 249,338 ¥ 210,341 ¥ 857,337  
(Loss)/profit from discontinued operations (attributable to owners of the Company) 209,499 (151,373) (132,836)  
Accounting profit (39,839) (361,714) (990,173)  
Tax calculated at PRC statutory income tax rate of 25% 9,960 90,429 247,543  
Differential of income tax rates applicable to subsidiaries 21,448 (36,590) (119,211)  
Expense not deductible for tax purposes (3,728) (3,863) (5,659)  
Incomes not subject to tax 2,910 191 542  
Tax losses and temporary differences for which no deferred income tax asset was recognized (50,869) (73,942) (73,690)  
Additional deductible allowance for research and development expenses 8,883 12,474 10,164  
Derecognition of deferred income tax asset (454,471)      
Utilization of previously unrecognized tax losses 10,499 1,539 2,458  
Income tax benefit/(expense) ¥ (455,368) ¥ (9,762) ¥ 62,147