XML 99 R79.htm IDEA: XBRL DOCUMENT v3.24.1.u1
Income tax (Details) - CNY (¥)
¥ in Thousands
12 Months Ended 48 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2018
Dec. 31, 2026
Income tax          
Percentage of tax deduction to tax assessable profits as percentage of qualified R&D expenses 200.00% 100.00% 75.00% 50.00%  
Deductible tax losses carry forwards ¥ 2,566,249        
HONG KONG          
Income tax          
Statutory income tax rate 16.50%        
CHINA          
Income tax          
Statutory income tax rate 25.00%        
Preferential income tax rate 15.00%        
CHINA | Kuntong          
Income tax          
Preferential income tax rate         15.00%