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Cash and cash equivalents
3 Months Ended
Mar. 31, 2014
Cash And Cash Equivalents [Abstract]  
Cash and cash equivalents

4. Cash and cash equivalents

 

     MARCH 31, 2014      DECEMBER 31, 2013  

Cash

   $ 49,538,874       $ 7,292,116   

Cash equivalents

     3,379,453         3,714,276   
  

 

 

    

 

 

 
   $ 52,918,327       $ 11,006,392