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Accrued Expenses (Tables)
 9 Months Ended
Sep. 30, 2015
Payables and Accruals [Abstract]  
Summary of Accrued Expenses

 

 

 

 

 

 

 

 

 

    

September 30, 

    

December 31, 

 

 

 

2015

 

2014

 

Accrued research and development expenses

 

$
2,559,451

 

$
2,726,511

 

Accrued license and milestone fees

 

 
2,000,000

 

 
1,500,000

 

Accrued consulting and other professional fees

 

 
353,748

 

 
77,273

 

Other accrued expenses

 

 
313,775

 

 
151,415

 

Accrued employee benefits

 

 
294,725

 

 
168,009

 

Accrued franchise and other taxes

 

 

 —

 

 
112,511

 

Accrued expenses

 

$
5,521,699

 

$
4,735,719