Accounts Receivable, Net (Tables)
 12 Months Ended
Dec. 31, 2021
Receivables [Abstract]  
Schedule of Accounts Receivable Activity
 
  
As of December 31,
 
 
  
2020
 
 
  
 
  
2021
(1)
 
 
  
 
 
 
 
 
  
 
 
 
  
(US$ thousand)
 
Accounts receivable
    $ 29,375              $ 38,955  
Less: allowance for 
current e
x
pected
credi
t losses
      (1,535 )               (6,336 ) 
    
 
 
             
 
 
  
Accounts receivable, net
    $ 27,840              $ 32,619  
    
 
 
             
 
 
  
Schedule of Movement of Allowance of Doubtful Accounts
Movement of allowance for credit losses was as follows:
 
 
  
As of December 31,
 
 
  
2019
 
 
  
 
  
2020
 
 
  
 
  
2021
(1)
 
 
  
 
 
 
 
 
  
 
 
 
 
 
  
 
 
 
  
(US$ thousand)
 
At beginning of the period
  
$
(367
) 
 
      
  
$
(1,036
) 
 
      
  
$
(1,535
) 
Additional provisions
  
 
(780
) 
 
      
  
 
(1,365
) 
 
      
  
 
(4,828
) 
Write-off
  
 
100
 
 
      
  
 
921
 
 
      
  
 
97
 
Foreign currency translation impact
  
 
11
 
 
      
  
 
(55
) 
 
      
  
 
(70
) 
 
  
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
  
 
 
 
At end of the period
  
$
(1,036
) 
 
      
  
$
(1,535
) 
 
      
  
$
(6,336
) 
 
  
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
  
 
 
 
 
(1)
The allowance for current expected credit losses reflects the Company’s estimated probable incurred losses upon adoption of ASC 326. See Note 2(j) for the Company’s CECL policy.