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Other income, gains or loss - net - Government grants and tax rebates (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Other Income Gains Or Losses [Line items]      
Government grants ¥ 27,421 ¥ 28,871 ¥ 44,202
Tax rebates 30,592 22,209 19,425
Government grants and tax rebates (Note a) 58,013 51,080 63,627
Technology development incentives      
Other Income Gains Or Losses [Line items]      
Government grants 10,493 14,391 25,425
Epidemic subsidies      
Other Income Gains Or Losses [Line items]      
Government grants     4,000
Operation subsidies      
Other Income Gains Or Losses [Line items]      
Government grants ¥ 16,928 ¥ 14,480 ¥ 14,777