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Accrued Liabilities (Tables)
6 Months Ended
Jun. 30, 2019
Payables and Accruals [Abstract]  
Schedule of Other Accrued Liabilities

Other accrued liabilities at June 30, 2019 and December 31, 2018 include the following:

 

  

June 30, 2019

   December 31, 2018 
   (Unaudited)     

Amounts due to contract research organizations

and other contractual agreements

  $1,061,448   $749,369 
Accrued payroll and related benefits   1,004,120    1,592,590 
Accrued professional fees   304,504    198,654 
Other   19,410    45,285 
Total  $2,389,482   $2,585,898