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Other Income (Expense), Net (Tables)
 12 Months Ended
Dec. 31, 2017
Other Income and Expenses [Abstract]  
Components of Other Income

The major changes in the components of Other income (expense), net for the years ended December 31 were as follows (in thousands):

 

     2017      2016      2015  

Rental income

    $ 792    $ 462    $ —  

Foreign currency gains (losses), net

      323      (268 )       (161 ) 

Interest income

      124      68      47

Gain (loss) on disposal of equipment

      14      (4 )       60

Credit gains on available-for-sale securities

      11      13      12

Other

      (2 )       13      67
  

 

 

     

 

 

     

 

 

  
   $ 1,262    $ 284    $ 25