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Expenses by nature - Research and development costs (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Research and development costs      
Employee benefit expenses ¥ 469,320 ¥ 514,456 ¥ 610,564
Technology service fees 946,700 859,324 682,222
Amortization of intangible assets 6,282 3,396 3,812
Depreciation of property and equipment 14,168 11,182 9,659
Impairment loss of intangible assets 3,837 3,747 5,597
Others 22,334 23,200 37,438
Amounts incurred 1,462,641 1,415,305 1,349,292
Less: capitalized      
Employee benefit expenses (19,827) (45,016) (125,767)
Technology service fees (25,123) (17,271) (50,235)
Capitalized research and development costs (44,950) (62,287) (176,002)
Research and development costs ¥ 1,417,691 ¥ 1,353,018 ¥ 1,173,290