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Other income (expenses)
 12 Months Ended
Dec. 31, 2016
Other Income and Expenses [Abstract]  
Other income (expenses)

8. Other income (expenses)

 

     YEARS ENDED DECEMBER 31,  
     2016     2015     2014  

Change in fair value of derivative liability

    $ 81     $ (52 )    $ 949  

Foreign exchange losses

      (13 )      (476 )      (361 ) 

Interest income

      619       108       91  

Miscellaneous

      (43 )      (100 )      4  
  

 

 

    

 

 

    

 

 

  
   $ 644     $ (520 )    $ 683