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Income tax - Composition of loss before tax (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income tax      
Loss from Mainland China operations ¥ (330,426) ¥ (717,979) ¥ (1,095,499)
Income/(loss) from overseas operations 25,721 (13,613) 1,587
Total loss before income tax ¥ (304,705) ¥ (731,592) ¥ (1,093,912)