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Share-based payments - Share-based compensation expenses (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Share-based compensation expenses recognized      
Share-based compensation expense - Total ¥ 1,012 ¥ 14,280 ¥ 13,196
Share-based compensation expense - Value of employee's services 490 10,954 7,759
Share-based compensation expense - Value of non-employee's services 522 3,326 5,437
Discontinued operations      
Share-based compensation expenses recognized      
Share-based compensation expense - Total 146 217 165
Continuing and Discontinued operations      
Share-based compensation expenses recognized      
Share-based compensation expense - Total 1,158 14,497 13,361
Cost of revenue      
Share-based compensation expenses recognized      
Share-based compensation expense - Total 87 3,184 (5)
Research and development expenses      
Share-based compensation expenses recognized      
Share-based compensation expense - Total 34 2,934 (136)
Selling and marketing expenses      
Share-based compensation expenses recognized      
Share-based compensation expense - Total (31) 1,860 991
General and administrative expenses      
Share-based compensation expenses recognized      
Share-based compensation expense - Total ¥ 922 ¥ 6,302 ¥ 12,346