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Other Income (Expense), Net
12 Months Ended
Dec. 31, 2021
Other Income and Expenses [Abstract]  
Other Income (Expense), Net
13.  OTHER INCOME (EXPENSE), NET
The components of Other income (expense), net for the years ended December 31 were as follows (in thousands):
 
    
2021
    
2020
    
2019
 
Interest income
   $ 930      $ 95      $ 300  
Rental income, net
     792        792        792  
(Loss) gain on disposal of equipment
     (72      13        38  
Foreign currency (losses) gains, net
     (336      181        (108
Other
     (111      12        44  
    
 
 
    
 
 
    
 
 
 
     $ 1,203      $ 1,093      $ 1,066