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Other income, net
 12 Months Ended
Dec. 31, 2018
Other Income and Expenses [Abstract]  
Other income, net

9. Other income, net

 

     YEARS ENDED DECEMBER 31,  
(in thousands)    2018      2017      2016  

Interest income

    $  1,563      $  998      $  619  

Foreign exchange losses

      (75 )       (19 )       (13 ) 

Change in fair value of derivative liability

      —          —          81  

Miscellaneous expenses (Note 10)

      (445 )       (39 )       (43 ) 
  

 

 

     

 

 

     

 

 

  
   $ 1,043      $ 940      $ 644