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PROPERTY AND EQUIPMENT, NET (Tables)
 12 Months Ended
Dec. 31, 2021
PROPERTY AND EQUIPMENT, NET [Abstract]  
Property and Equipment, Net

 
As of December 31,
  
   
2020
$
    
2021
$
  
             
Computers
    
522,108
      
883,249
  
Office equipment, furniture and fittings
    
31,613
      
43,060
  
Leasehold improvements
    
162,032
      
252,778
  
Transportation assets
    
6,184
      
208,701
  
Warehouse equipment
    
7,296
      
20,796
  
Land
    
22,708
      
196,421
  
Building
    
2,093
      
1,956
  
Construction-in-progress
    
973
      
22,952
  
     
755,007
      
1,629,913
  
Less: accumulated depreciation
    
(368,606
)
    
(599,950
)
     
386,401
      
1,029,963
  
Depreciation Expenses
Depreciation expenses recognized for each of the years ended December 31, 2019, 2020 and 2021 were included in the following captions:

 
Year ended December 31,
  
   
2019
$
    
2020
$
    
2021
$
  
                   
Cost of revenue
    
80,245
      
118,691
      
180,140
  
Sales and marketing expenses
    
3,200
      
4,965
      
7,960
  
General and administrative expenses
    
31,282
      
41,384
      
64,187
  
Research and development expenses
    
2,056
      
4,027
      
8,395
  
     
116,783
      
169,067
      
260,682