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Net loss per common share (Tables)
 3 Months Ended
Mar. 31, 2020
Earnings Per Share [Abstract]  
Net loss per common share (Tables)

 

   Three months ended
March 31,
2020		  Three months ended March 31,
2019
       
Stock options   —      480,000 
Warrants to purchase shares of common stock   154,455,397,549    111,197,591 
Convertible notes   48,756,889,839    83,671,069 
    203,212,287,388    195,348,660