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Long-Term Investments (Tables)
 12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of Other Income Net
Total unrealized and realized gains and losses of equity investments without readily determinable fair values in 2019, 2020 and 2021 were as follows:
 
     For the years ended December 31  
     2019      2020      2021  
    
 
RMB
      RMB      RMB      US$  
Gross unrealized gains (upward adjustments)
      17,298        —          —          —    
Gross unrealized losses (downward adjustments including impairment)
      —          (39,181 )       (25,370 )       (3,981 ) 
    
 
 
     
 
 
     
 
 
     
 
 
  
Net unrealized gains/losses on equity investments held
      17,298        (39,181 )       (25,370 )       (3,981 ) 
Net realized gains on equity investments sold
      6,778        —          —          —    
    
 
 
     
 
 
     
 
 
     
 
 
  
Total net gains/losses recognized in other income, net
      24,076        (39,181 )       (25,370 )       (3,981 )