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Other income, gains or loss - net - Remeasurement of redemption liability (Details) - CNY (¥)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 30, 2022
Other Income Gains Or Losses [Line items]      
Guarantee loss, net ¥ 10,757,000 ¥ (69,185,000)  
Share purchase agreement      
Other Income Gains Or Losses [Line items]      
Equity interest acquired (as a percent)     20.00%
BER Technology | Share purchase agreement      
Other Income Gains Or Losses [Line items]      
Contractual consideration     ¥ 15,000,000