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Income tax benefits - Unused Tax Losses (Details) - Unused tax losses [member] - CNY (¥)
¥ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits    
Unused tax losses for which no deferred tax asset has been recognized ¥ 2,525,806 ¥ 1,982,709
Year 2022    
Disclosure of temporary difference, unused tax losses and unused tax credits    
Unused tax losses for which no deferred tax asset has been recognized 277,048 277,048
Year 2023    
Disclosure of temporary difference, unused tax losses and unused tax credits    
Unused tax losses for which no deferred tax asset has been recognized 118,796 118,502
Year 2024    
Disclosure of temporary difference, unused tax losses and unused tax credits    
Unused tax losses for which no deferred tax asset has been recognized 419,866 419,866
Year 2025    
Disclosure of temporary difference, unused tax losses and unused tax credits    
Unused tax losses for which no deferred tax asset has been recognized 83,576 82,441
Year 2026    
Disclosure of temporary difference, unused tax losses and unused tax credits    
Unused tax losses for which no deferred tax asset has been recognized 208,346 104,316
Year 2027    
Disclosure of temporary difference, unused tax losses and unused tax credits    
Unused tax losses for which no deferred tax asset has been recognized 67,745  
Year 2028    
Disclosure of temporary difference, unused tax losses and unused tax credits    
Unused tax losses for which no deferred tax asset has been recognized 1,826 1,826
Year 2029    
Disclosure of temporary difference, unused tax losses and unused tax credits    
Unused tax losses for which no deferred tax asset has been recognized 7,149 7,149
Year 2030    
Disclosure of temporary difference, unused tax losses and unused tax credits    
Unused tax losses for which no deferred tax asset has been recognized 8,049 8,051
Year 2031    
Disclosure of temporary difference, unused tax losses and unused tax credits    
Unused tax losses for which no deferred tax asset has been recognized 56,195 ¥ 60,059
Year 2032    
Disclosure of temporary difference, unused tax losses and unused tax credits    
Unused tax losses for which no deferred tax asset has been recognized ¥ 122,036