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 ($)
Sep. 30, 2016
Dec. 31, 2015
Accrued expenses    
Accrued compensation expense $ 983,951 $ 704,597
Accrued audit and tax fees 394,414 179,223
Accrued professional fees, and other 360,200 194,790
Accrued R&D fees 1,019,024 466,076
Accrued other 140,799 194,694
Total amount of accrued expenses $ 2,898,388 $ 1,739,380