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Cash and cash equivalents
6 Months Ended
Jun. 30, 2014
Cash And Cash Equivalents [Abstract]  
Cash and cash equivalents

4. Cash and cash equivalents

 

     JUNE 30,
2014
     DECEMBER 31,
2013
 

Cash

   $ 2,144,656       $ 7,292,116   

Cash equivalents

     15,751,454         3,714,276   
  

 

 

    

 

 

 
   $ 17,896,110       $ 11,006,392