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Accrued Expenses - Summary of Accrued Expenses (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Accrued Expenses    
Accrued research and development expenses $ 4,663,931 $ 3,483,741
Accrued consulting and other professional fees 431,754 140,397
Accrued employee benefits 513,787 385,789
Other accrued expenses 153,340 263,693
Accrued expenses $ 5,762,812 $ 4,273,620