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Property and Equipment
12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property and Equipment
8. PROPERTY AND EQUIPMENT
 
    
December 31
 
    
2020
    
2021
 
    
US$
    
US$
 
Cost:
                 
Land
     68,243        68,243  
Buildings
     18,130        30,006  
Machinery and equipment
     35,555        44,128  
Furniture and fixtures
     7,855        8,254  
Leasehold and buildings improvement
     8,023        8,680  
Software
     33,528        41,621  
    
 
 
    
 
 
 
Total
     171,334        200,932  
    
 
 
    
 
 
 
Accumulated depreciation:
                 
Buildings
     4,033        5,840  
Machinery and equipment
     22,922        28,567  
Furniture and fixtures
     5,862        6,017  
Leasehold and buildings improvement
     6,221        7,156  
Software
     27,293        35,143  
    
 
 
    
 
 
 
       66,331        82,723  
Prepayment and construction in progress
     493        6,269  
    
 
 
    
 
 
 
       105,496        124,478  
    
 
 
    
 
 
 
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 2022. Net carrying value of the properties as of December 31, 2020 and 2021, was US$654 thousand and US$636 thousand, respectively. Annual rental income from the lease is US$47 thousand.
In September 2018, the Company paid US$58,931 thousand to acquire land in Hsinchu, Taiwan for its future Taiwan headquarters building. In January 2021, the Company broke ground at this site and began construction work.