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Income Taxes - Deferred tax assets and deferred tax liabilities (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets        
Net operating loss carry forwards ¥ 705,249 ¥ 373,215    
Deductible temporary differences 72,625 31,348    
Deferred revenue 19,620 6,294    
Less: valuation allowance ¥ (797,494) (410,857) ¥ (241,485) ¥ (136,269)
Deferred tax liabilities        
Identifiable intangible assets from business combination.   439    
Total deferred tax liabilities   ¥ 439