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Property and Equipment
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property and Equipment
9. 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  
    
 
 
    
 
 
 
In April 2006, the Company
leased
a property located in Taipei, Taiwan to a third party. The lessee has been renewing annually and last renewed in March 2021. Net carrying value of the properties as of December 31, 2019 and 2020 was US$673 thousand and US$654 thousand, respectively. Annual rental income from the lease is US$45 thousand.
In September 2018, the Company paid US$58,931 thousand to acquire land in Hsinchu, Taiwan for the purpose of constructing its future Taiwan headquarters building.