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Accrued Expenses - Summary of Accrued Expenses (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Accrued Expenses    
Accrued research and development expenses $ 4,241,613 $ 5,149,697
Accrued bonuses 2,035,080 2,677,288
Accrued consulting and other professional fees 354,465 320,935
Accrued employee benefits 694,718 351,966
Other accrued expenses 153,917 210,904
Accrued expenses $ 7,479,793 $ 8,710,790