Quarterly report pursuant to Section 13 or 15(d)

Accrued Expenses - Summary of Accrued Expenses (Detail)

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Accrued Expenses - Summary of Accrued Expenses (Detail) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Payables and Accruals [Abstract]    
Accrued compensation costs $ 1,690,113 $ 1,133,742
Accrued research and development fees 624,190 590,307
Accrued professional fees 543,774 317,796
Other 251,660 209,922
Accrued expenses and other current liabilities $ 3,109,737 $ 2,251,767