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Lease
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Lease
18. LEASE
Operating Leases
The Company entered into various operating lease agreements which consist of real property and office equipment with lease periods expiring between fiscal years 2021 and 2027. The Company recognized leased assets in operating lease assets of US$8,603 and US$6,704 thousand and corresponding accrued expenses and other current liabilities of US$3,046 and US$3,058 thousand, and other long-term liabilities of US$5,621 and US$3,881 thousand. The weight average remaining lease term was 3.5 years and 2.87 years, and the weight average discount rate was 3.78% and 3.56% as of December 31, 2019 and 2020, respectively.
Future minimum lease payments under the operating leases as of December 31, 2020, were as follows:
 
    
Operating Lease Obligations
  
Fiscal Year:
         
2021
    $ 3,253  
2022
      1,875  
2023
      1,372  
2024
      783  
2025
      24  
2026 and thereafter
      32  
    
 
 
  
Total
      7,339  
Less imputed interest
      400  
    
 
 
  
Present value of net future minimum lease payments
      6,939  
Less operating lease liabilities-current
      3,058  
    
 
 
  
Long-term operating lease liabilities
    $ 3,881  
    
 
 
  
Operating lease expense for the years ended December 31, 2018, 2019 and 2020
were
US$3,933 thousand, US$4,775 thousand, and US$4,261 thousand, respectively. For the supplemental cash flow information related to leases,
the cash paid for amounts included in the measurement of operating lease liabilities were US$3,233 thousand and US$3,226 thousand for the year ended December 31, 2019 and 2020, respectively.