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Deferred income tax - Deferred tax liabilities (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred Income Tax      
Deferred tax liabilities, Opening balance ¥ 9,861 ¥ 20,080 ¥ 33,291
Recognized in the profit or loss (4,665) (10,219) (13,211)
Deferred tax liabilities, Closing balance 5,196 9,861 20,080
Intangible assets acquired through business combination      
Deferred Income Tax      
Deferred tax liabilities, Opening balance 9,861 20,080 33,291
Recognized in the profit or loss (4,665) (10,219) (13,211)
Deferred tax liabilities, Closing balance ¥ 5,196 ¥ 9,861 ¥ 20,080