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, 2017
Dec. 31, 2016
Accrued expenses    
Accrued compensation expense $ 1,412,121 $ 1,198,448
Accrued professional fees 1,208,945 867,969
Accrued R&D fees 932,542 1,040,321
Accrued taxes 1,062,072  
Accrued audit and tax fees 314,656 454,931
Accrued other 169,582 157,788
Total amount of accrued expenses $ 5,099,918 $ 3,719,457