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Accrued Expenses - Summary of Accrued Expenses (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Accrued Expenses    
Accrued research and development expenses $ 3,967,216 $ 3,483,741
Accrued consulting and other professional fees 457,877 140,397
Accrued employee benefits 440,136 385,789
Other accrued expenses 317,397 263,693
Accrued expenses $ 5,182,626 $ 4,273,620