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Stock Compensation (Tables)
3 Months Ended
Mar. 31, 2020
Share-based Payment Arrangement [Abstract]  
Stock-Based Compensation Expense
For the three-month periods ended March 31, 2020 and 2019, the Company recorded stock-based compensation expense as follo
w
s:
 
   
Three months ended

March 31,
 
   
2020
   
2019
 
Research and development
  $418,053   $287,721 
Selling, general and administrative
   1,101,298    645,690 
  
 
 
   
 
 
 
Total stock-based compensation
  $1,519,351   $933,411