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Cash and cash equivalents (Tables)
 12 Months Ended
Dec. 31, 2017
Cash and Cash Equivalents [Abstract]  
Schedule of Cash and Cash Equivalents
(in thousands)    DECEMBER 31,
2017		      DECEMBER 31,
2016		  

Cash

    $ 12,583      $ 3,726  

Cash equivalents

      39,449        28,575  
  

 

 

     

 

 

  
   $ 52,032      $ 32,301