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Accrued Expenses - Summary of Accrued Expenses (Detail) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Accrued Expenses    
Accrued research and development expenses $ 3,120,685 $ 2,702,445
Accrued consulting and other professional fees 555,972 227,811
Other accrued expenses 256,931 304,421
Accrued employee benefits 384,760 331,930
Accrued expenses $ 4,318,348 $ 3,566,607