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Other income (expenses) (Tables)
12 Months Ended
Dec. 31, 2022
Other Income, Nonoperating [Abstract]  
Schedule of Other Nonoperating Income, by Component
     Year ended December 31,  
     2020      2021      2022  
     RMB      RMB      RMB      US$  
Government grants
     10,346        20,879        31,531        4,571  
Impairment for long-term investments (Note 8)
     (39,181      (25,370      (6,726      (975
Impairment for loan receivables (Note 4)
     (4,500      (528      (705      (102
Income from ADR profit-sharing program
     2,257        2,111        2,207        320  
Others
     264        —          11        2  
    
 
 
    
 
 
    
 
 
    
 
 
 
Total
     (30,814      (2,908      26,318        3,816