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Accrued Expenses - Summary of Accrued Expenses (Detail) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Payables and Accruals [Abstract]    
Accrued research and development expenses $ 2,239,334 $ 2,726,511
Accrued license and milestone fees 2,000,000 1,500,000
Accrued consulting and other professional fees 199,376 77,273
Other accrued expenses 453,857 151,415
Accrued employee benefits 311,829 168,009
Accrued taxes   112,511
Accrued expenses $ 5,204,396 $ 4,735,719