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Accrued Liabilities (Tables)
9 Months Ended
Sep. 30, 2018
Payables and Accruals [Abstract]  
Schedule of Other Accrued Liabilities

Other accrued liabilities as of September 30, 2018 and December 31, 2017 include the following:

 

    September 30, 2018     December 31, 2017  
Amounts due to contract research organizations and
other contractual agreements
  $ 730,811     $ 665,373  
Accrued payroll and related benefits     1,048,077       1,258,265  
Accrued professional fees     341,240       264,668  
Other     20,000       94,521  
Total   $ 2,140,128     $ 2,282,827