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Accrued Expenses - Summary of Accrued Expenses (Detail) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Accrued Expenses    
Accrued research and development expenses $ 2,702,445 $ 2,513,243
Accrued consulting and other professional fees 227,811 148,579
Other accrued expenses 304,421 315,002
Accrued employee benefits 331,930 290,547
Accrued expenses $ 3,566,607 $ 3,267,371