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Intangible assets, net - Amortization expenses on intangible assets allocated to expense items (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Intangible assets, net      
Total amortization ¥ 22,568 ¥ 21,875 ¥ 20,478
Cost of revenues      
Intangible assets, net      
Total amortization   77 96
Selling and marketing expenses      
Intangible assets, net      
Total amortization 257 876 1,027
General and administrative expenses      
Intangible assets, net      
Total amortization 9,590 5,845 2,535
Research and development expenses      
Intangible assets, net      
Total amortization ¥ 12,721 ¥ 15,077 ¥ 16,820