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Expenses by nature - Research and development costs (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Research and development costs      
Employee benefit expenses ¥ 203,127 ¥ 349,458 ¥ 467,720
Technology service fees 314,413 585,741 907,552
Amortization of intangible assets 232 4,438 6,282
Depreciation of property and equipment 3,222 7,023 11,098
Impairment loss of intangible assets   2,004 3,837
Others 7,200 14,726 21,273
Amounts incurred 528,194 963,390 1,417,762
Less: capitalized      
Employee benefit expenses (10,740) (1,875) (18,227)
Technology service fees (6,556) (6,314) (120)
Capitalized research and development costs (17,296) (8,189) (18,347)
Research and development costs ¥ 510,898 ¥ 955,201 ¥ 1,399,415