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Other liabilities
 3 Months Ended
Mar. 31, 2018
Other Liabilities Disclosure [Abstract]  
Other liabilities

4. Other liabilities

 

(in thousands)    MARCH 31,
2018		      DECEMBER 31,
2017		  

Capital lease obligations

    $ 28      $ 33  

Deferred rent liability

      415        453  
  

 

 

     

 

 

  
   $ 443      $ 486