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Cash, Cash Equivalents, and Restricted Cash (Tables)
12 Months Ended
Dec. 31, 2021
Cash and Cash Equivalents [Abstract]  
Details of Cash, Cash Equivalents, and Restricted Cash
    
December 31
 
    
2020
    
2021
 
    
US$
    
US$
 
Cash and deposits in bank
     54,947        135,099  
Time deposits
     265,936        189,544  
Repurchase agreements
     22,078        35,439  
    
 
 
    
 
 
 
Total cash and cash equivalents
     342,961        360,082  
Restricted cash
     26,250        55,441  
    
 
 
    
 
 
 
       369,211        415,523