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Cash and cash equivalents (Tables)
3 Months Ended
Mar. 31, 2016
Cash and Cash Equivalents [Abstract]  
Schedule of Cash and Cash Equivalents
     MARCH 31,
2016
     DECEMBER 31,
2015
 

Cash

   $ 4,073       $ 2,133   

Cash equivalents

     31,618         37,393   
  

 

 

    

 

 

 
   $ 35,691       $ 39,526