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Property and Equipment, Net
12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment, Net [Abstract]  
Property and Equipment, Net
 
8.
Property
and Equipment, Net
 
    
As of December 31,
 
    
2021
    
2022
 
    
RMB
    
RMB
    
US$
 
Leasehold improvements
     30,250        32,634        4,731  
Machinery and electronic equipment
     22,547        29,061        4,214  
Transportation equipment
     3,643        3,249        471  
Office equipment
     2,511        2,641        383  
Construction in progress
     1,720        1,885        273  
Mold and tooling
     —          2,290        332  
    
 
 
    
 
 
    
 
 
 
       60,671        71,760        10,404  
Less: accumulated depreciation
     (25,223      (23,240      (3,369
Less: accumulated impairment
     (1,627      (1,460      (212
    
 
 
    
 
 
    
 
 
 
    
 
33,821
 
  
 
47,060
 
  
 
6,823
 
    
 
 
    
 
 
    
 
 
 
For the years ended December 31, 2020, 2021 and 2022, the Group recorded depreciation expense of RMB5,785, RMB7,427 and RMB8,478 (US$1,229
)
, respectively.