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Accrued Expenses - Summary of Accrued Expenses (Detail) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Accrued Expenses    
Accrued research and development expenses $ 1,825,844 $ 2,702,445
Accrued consulting and other professional fees 341,859 227,811
Other accrued expenses 246,437 304,421
Accrued employee benefits 444,986 331,930
Accrued expenses $ 2,859,126 $ 3,566,607