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Accrued Expenses - Summary of Accrued Expenses (Details) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Payables and Accruals [Abstract]    
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