Prepayments and Other Current Assets (Tables)
12 Months Ended
Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Prepayments and Other Current Assets
The prepayments and other current assets consisted of the following:
 
 
  
As of December 31,
 
 
  
2020
 
 
  
 
  
2021
 
 
  
 
 
 
 
 
  
 
 
 
  
(US$ thousand)
 
Prepayments
(1)
   $ 1,772              $ 2,820  
Interest receivables
     1,446                2,674  
VAT recoverable
(2)

     1,353                1,806  
Employee loans and advances
(
3
)

     2,186                888  
Proceeds receivable for employee share option exercises

     612                329  
Restricted cash

     80                130  
Others
     10                154  
    
 
 
            
 
 
 
     $ 7,459              $ 8,801  
    
 
 
            
 
 
 
 
(1)
Prepayments are primarily related to prepayments for services, advertisements and other deposits.
(2)
VAT recoverable represented the balances that the Group can utilize to deduct its VAT liabilities within the next 12 months.
(3)
Employee advances and loans are primarily advances to employees that are business related, taxes paid on behalf of employees related to their options, or personal loans granted to select qualified employees with interest or a guarantee. The loan balances are expected to be repaid by the employee within one year.