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 ($)
Mar. 31, 2016
Dec. 31, 2015
Accrued expenses    
Accrued compensation expense $ 449,376 $ 704,597
Accrued audit and tax fees 183,081 179,223
Accrued professional fees, and other 733,221 194,790
Accrued R&D expense 873,666 466,076
Accrued other 82,700 194,694
Total amount of accrued expenses $ 2,322,044 $ 1,739,380