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Share-based payments - Share-based compensation expenses (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based compensation expenses recognized      
Share-based compensation expense - Total ¥ 13,361 ¥ 25,409 ¥ 89,652
Share-based compensation expense - Value of employee's services 13,176 22,618 74,980
Share-based compensation expense - Value of non-employee's services 185 2,791 14,672
Cost of revenue      
Share-based compensation expenses recognized      
Share-based compensation expense - Total   935 6,904
Research and development expenses      
Share-based compensation expenses recognized      
Share-based compensation expense - Total   5,185 26,635
Selling and marketing expenses      
Share-based compensation expenses recognized      
Share-based compensation expense - Total 1,002 2,854 21,049
General and administrative expenses      
Share-based compensation expenses recognized      
Share-based compensation expense - Total ¥ 12,359 ¥ 16,435 ¥ 35,064