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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Summary of Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
    
Fair Value Measurement at
December 31, 2020 Using
 
    
Quoted Prices
in Active Market
for Identical
Assets (Level 1)
    
Significant

Other
Observable
Inputs (Level 2)
    
Unobservable
inputs
(Level 3)
    
Fair Value at
December 31,
2020
 
    
RMB
    
RMB
    
RMB
    
RMB
    
US$
 
Short-term investments
     —          73,022        —          73,022        11,191  
    
 
 
    
 
 
    
 
 
    
 
 
    
 
 
 
Total
     —          73,022        —          73,022        11,191