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Prepayments and other current assets (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Jan. 01, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Prepayments and other current assets        
Prepayments to suppliers ¥ 201,865     ¥ 174,860
Contract cost assets 192,848      
Prepaid rental and deposits       5,256
Deferred offering costs       5,719
Others 18,221     14,240
Prepayments and other current assets ¥ 412,934 $ 59,870 ¥ 195,617 ¥ 200,075