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Other Income (Expense), Net
12 Months Ended
Dec. 31, 2020
Other Income and Expenses [Abstract]  
Other Income (Expense), Net
15.  OTHER INCOME (EXPENSE), NET
The major changes in the components of Other income (expense), net for the years ended December 31 were as follows (in thousands):
 
    
2020
    
2019
    
2018
 
Rental income, net
   $ 792      $ 792      $ 792  
Foreign currency gains (losses), net
     181        (108      (260
Interest income
     95        300        257  
Gain on disposal of equipment
     13        38        57  
Credit gains on
available-for-sale
securities
     4        4        7  
Other
     8        40        21  
    
 
 
    
 
 
    
 
 
 
     $ 1,093      $ 1,066      $ 874