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Other income (expenses)
 12 Months Ended
Dec. 31, 2017
Other Income and Expenses [Abstract]  
Other income (expenses)

8. Other income (expenses)

 

     YEARS ENDED
DECEMBER 31,		  
(in thousands)    2017      2016      2015  

Change in fair value of derivative liability

    $ —        $ 81      $ (52 ) 

Foreign exchange losses

      (19 )       (13 )       (476 ) 

Interest income

      998        619        108  

Miscellaneous expenses

      (39 )       (43 )       (100 ) 
  

 

 

     

 

 

     

 

 

  
   $ 940      $ 644      $ (520 )