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Accrued Expenses - Summary of Accrued Expenses (Detail) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Accrued Expenses    
Accrued research and development expenses $ 2,927,377 $ 2,513,243
Accrued consulting and other professional fees 336,497 148,579
Other accrued expenses 371,563 315,002
Accrued employee benefits 399,468 290,547
Accrued expenses $ 4,034,905 $ 3,267,371