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Other Accrued Liabilities - Schedule of Other Accrued Liabilities (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Amounts due to contract research organizations and other contractual agreements $ 749,369 $ 665,373
Accrued payroll and related benefits 1,592,590 1,258,265
Accrued professional fees 198,654 264,668
Other 45,285 94,521
Total $ 2,585,898 $ 2,282,827