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Cash and cash equivalents
3 Months Ended
Mar. 31, 2017
Cash and Cash Equivalents [Abstract]  
Cash and cash equivalents

3. Cash and cash equivalents

 

     MARCH 31,
2017
     DECEMBER 31,
2016
 

Cash

   $ 18,686      $ 3,726  

Cash equivalents

     2,230        28,575  
  

 

 

    

 

 

 
   $ 20,916      $ 32,301