Quarterly report pursuant to Section 13 or 15(d)

Accrued Expenses - Schedule of Accrued Expenses (Detail)

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Accrued Expenses - Schedule of Accrued Expenses (Detail) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Payables And Accruals [Abstract]    
Accrued professional fees $ 387,749 $ 1,106,358
Accrued bonus compensation   422,226
Accrued payroll and benefits 102,916 99,548
Accrued research costs 61,720 29,682
Other 240,542 169,053
Total $ 792,927 $ 1,826,867