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Other Accrued Liabilities - Schedule of Other Accrued Liabilities (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]    
Amounts due to contract research organizations and other contractual agreements $ 475,440 $ 749,369
Accrued payroll and related benefits 1,604,541 1,592,590
Accrued professional fees 204,155 198,654
Other 19,411 45,285
Total $ 2,303,547 $ 2,585,898