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Other income (expenses) (Tables)
 12 Months Ended
Dec. 31, 2021
Other Income, Nonoperating [Abstract]  
Schedule of Other Nonoperating Income, by Component
     Year ended December 31,  
     2019      2020     2021  
     RMB      RMB     RMB     US$  
Government grants
      12,546        10,346       20,879       3,276  
Gain on an equity investment sold (Note 7)
      6,778        —         —         —    
Unrealized gain on equity investments held (Note 7)
      17,298        —         —         —    
Impairment for long-term investments (Note 7)
      —          (39,181 )      (25,370 )      (3,981 ) 
Impairment for loan receivables (Note 4)
      —          (4,500 )      (528 )      (83 ) 
Income from ADR profit-sharing program
      2,190        2,257       2,111       332  
Others
      —          264       —         —    
    
 
 
     
 
 
    
 
 
    
 
 
  
Total
      38,812        (30,814 )      (2,908 )      (456 )