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Other Accrued Liabilities - Schedule of Other Accrued Liabilities (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Payables and Accruals [Abstract]    
Amounts due to contract research organizations and other contractual agreements $ 284,000 $ 475,440
Accrued payroll and related benefits 1,054,272 1,604,541
Accrued professional fees 150,000 204,155
Other 19,411 19,411
Total $ 1,507,683 $ 2,303,547