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Accrued Liabilities - Schedule of Other Accrued Liabilities (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]    
Amounts due to contract research organizations and other contractual agreements $ 1,316,545 $ 749,369
Accrued payroll and related benefits 803,706 1,592,590
Accrued professional fees 323,304 198,654
Other 19,410 45,285
Total $ 2,462,965 $ 2,585,898