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Cash and cash equivalents
9 Months Ended
Sep. 30, 2014
Cash and Cash Equivalents [Abstract]  
Cash and cash equivalents

4. Cash and cash equivalents

 

     SEPTEMBER 30,
2014
     DECEMBER 31,
2013
 

Cash

   $ 4,292,928       $ 7,292,116   

Cash equivalents

     11,576,306         3,714,276   
  

 

 

    

 

 

 
   $ 15,869,234       $ 11,006,392