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Cash and cash equivalents
12 Months Ended
Dec. 31, 2014
Cash and Cash Equivalents [Abstract]  
Cash and cash equivalents

4. Cash and cash equivalents

 

     DECEMBER 31,
2014
     DECEMBER 31,
2013
 

Cash

   $ 8,350,885       $ 7,292,116   

Cash equivalents

     6,555,202         3,714,276   
  

 

 

    

 

 

 
$ 14,906,087    $ 11,006,392