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Inventories (Tables)
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Components of Inventory
The components of inventories are as follows:
 
    
December 31
 
    
2019
    
2020
 
    
US$
    
US$
 
Finished goods
     26,305        11,039  
Work in process
     37,342        55,988  
Raw materials
     24,792        43,135  
    
 
 
    
 
 
 
       88,439        110,162