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Accrued Expenses - Summary of Accrued Expenses (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Accrued Expenses    
Accrued research and development expenses $ 4,243,166 $ 5,149,697
Accrued bonuses 1,170,981 2,677,288
Accrued consulting and other professional fees 509,299 320,935
Accrued employee benefits 549,263 351,966
Other accrued expenses 178,403 210,904
Accrued expenses $ 6,651,112 $ 8,710,790