Taxes Payable
 12 Months Ended
Dec. 31, 2021
Income Tax Disclosure [Abstract]  
Taxes Payable
11.
Taxes Payable
Taxes payable consisted of the following: 
 
 
  
As of December 31,
 
 
  
2020
 
 
  
 
2021
 
 
  
(US$ thousand)
 
Individual income tax withholding

    $ 330           
$
 2,118  
VAT payable

      1,182           
 
 299  
Corporate income taxes payable

      626           
 
 1
 
Other taxes payable
     
33
           
 
17
  
    
 
 
           
 
 
  
     $ 2,171           
$
 2,435