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Intangible assets - Amortization (Details) - CNY (¥)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Intangible assets      
Amortization of intangible assets ¥ 162,121,000 ¥ 302,774,000 ¥ 282,697,000
Impairment charge on intangible assets 10,208,000    
Cost of revenue      
Intangible assets      
Amortization of intangible assets 146,466,000 297,406,000 275,479,000
Impairment charge on intangible assets 6,371,000    
Research and development expenses      
Intangible assets      
Amortization of intangible assets 6,282,000 3,396,000 3,812,000
Impairment charge on intangible assets 3,837,000    
General and administrative expenses      
Intangible assets      
Amortization of intangible assets ¥ 9,373,000 ¥ 1,972,000 ¥ 3,406,000