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Net loss per common share (Tables)
6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Net loss per common share (Tables)

 

   June 30,
2019
  June 30,
2018
       
Stock options   480,000    480,000 
Warrants   116,735,091    82,587,408 
Convertible notes   78,944,078    43,916,472 
           
    196,159,169    126,983,880