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 ($)
Sep. 30, 2016
Dec. 31, 2015
Payables and Accruals [Abstract]    
Accrued compensation costs $ 1,511,679 $ 1,133,742
Accrued professional fees 461,913 317,796
Accrued research and development fees 321,118 590,307
Other 252,466 209,922
Total accrued expenses $ 2,547,176 $ 2,251,767