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Accrued Liabilities - Schedule of Accrued Liabilities (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Payables and Accruals [Abstract]    
Amounts due to contract research organizations and other contractual agreements $ 855,517 $ 636,000
Accrued payroll and related benefits 790,111 1,736,271
Accrued professional fees 138,430 66,850
Other 19,411 19,411
Total $ 1,803,469 $ 2,458,532