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Other Accrued Liabilities (Tables)
 12 Months Ended
Dec. 31, 2018
Payables and Accruals [Abstract]  
Schedule of Other Accrued Liabilities

Other accrued liabilities at December 31, 2019 and 2018 include the following:

 

    Year Ended December 31,  
    2019     2018  
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