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Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property and Equipment
 
    
December 31
 
    
2019
    
2020
 
    
US$
    
US$
 
Cost:
                 
Land
     68,243        68,243  
Buildings
     18,130        18,130  
Machinery and equipment
     26,426        35,555  
Furniture and fixtures
     6,919        7,855  
Leasehold and buildings improvement
     7,964        8,023  
Software
     25,938        33,528  
    
 
 
    
 
 
 
Total
     153,620        171,334  
    
 
 
    
 
 
 
Accumulated depreciation:
                 
Buildings
     3,632        4,033  
Machinery and equipment
     18,828        22,922  
Furniture and fixtures
     5,196        5,862  
Leasehold and buildings improvement
     5,350        6,221  
Software
     22,312        27,293  
    
 
 
    
 
 
 
       55,318        66,331  
Prepayment and construction in progress
     186        493  
    
 
 
    
 
 
 
       98,488        105,496