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Loss per share (Tables)
6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Basic and Diluted Loss Per Share
Basic and diluted loss per share is calculated as follows:
 
     For the six months ended June 30,  
     2020     2021  
     Class A     Class B     Class A     Class B  
     RMB     RMB     RMB     US$     RMB     US$  
Numerator:
                                                
Net loss attributable to Class A and Class B common shareholders
     (71,306     (20,140     (54,429     (8,430     (15,005     (2,324
Net loss attributable to common shareholders
     (71,306     (20,140     (54,429     (8,430     (15,005     (2,324
    
 
 
   
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Denominator:
                                                
Weighted average number of shares used in calculating basic and diluted loss per share
     60,190,846       17,000,189       61,668,577       61,668,577       17,000,189       17,000,189  
    
 
 
   
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Basic and diluted loss per share
     (1.18     (1.18     (0.88     (0.14     (0.88     (0.14