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Redeemable noncontrolling interests - Additional Information (Details) - Send Cloud [Member]
¥ in Thousands
Dec. 31, 2022
CNY (¥)
Redeemable Noncontrolling Interest [Line Items]  
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 47.63%
Fair value of redeemable noncontrolling interests ¥ 31,397