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Accrued Expenses - Summary of Accrued Expenses (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Accrued Expenses    
Accrued research and development expenses $ 5,732,775 $ 3,483,741
Accrued consulting and other professional fees 257,467 140,397
Accrued employee benefits 465,385 385,789
Other accrued expenses 143,620 263,693
Accrued expenses $ 6,599,247 $ 4,273,620