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Redeemable noncontrolling interests (Tables)
12 Months Ended
Dec. 31, 2022
Noncontrolling Interest [Abstract]  
Summary of redeemable non-controlling interests balance
The following table presents the activity of the redeemable noncontrolling interests balance for the year ended December 31, 2022:
 
     RMB      US$  
Balance as of January 1, 2022
     —          —    
Initial fair value of redeemable noncontrolling interests
     31,397        4,552  
Net loss attributable to redeemable noncontrolling interest
     (1,486      (215
Adjustment of redeemable noncontrolling interests to redemption value
     641        93  
    
 
 
    
 
 
 
Balance as of December 31, 2022
     30,552        4,430