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Accrued Expenses - Summary of Accrued Expenses (Detail) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Accrued Expenses    
Accrued research and development expenses $ 3,483,741 $ 2,702,445
Accrued consulting and other professional fees 140,397 227,811
Accrued employee benefits 385,789 331,930
Other accrued expenses 263,693 304,421
Accrued expenses $ 4,273,620 $ 3,566,607