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Other income, net (Tables)
12 Months Ended
Dec. 31, 2019
Other Income and Expenses [Abstract]  
Schedule of Other Income, Net
   
YEARS ENDED DECEMBER 31,
 
(in thousands)
  
2019
   
2018
   
2017
 
Interest income
  $1,542   $1,563   $998 
Foreign exchange losses
   (16   (75   (19
Miscellaneous expenses (Note 10)
   (8   (445   (39
  
 
 
   
 
 
   
 
 
 
  $1,518   $1,043   $940