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Trade receivables - Summary of loss allowance for trade receivables (Detail) - CNY (¥)
¥ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Disclosure of Trade Receivables [Abstract]    
Beginning of the year/period ¥ 22,252 ¥ 2,470
Provision for/ (reversal) of expected credit loss,net (3,235) 19,782
End of the year/period ¥ 19,017 ¥ 22,252