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 ($)
Jun. 30, 2015
Dec. 31, 2014
Payables and Accruals [Abstract]    
Accrued compensation costs $ 1,207,597 $ 1,865,778
Accrued professional fees 496,506 286,443
Accrued research and development fees 479,422 202,183
Accrued licensing fees 50,000 200,000
Other 126,676 156,803
Accrued expenses and other current liabilities $ 2,360,201 $ 2,711,207