Net loss per common share (Tables)

9 Months Ended

Sep. 30, 2020

Earnings Per Share [Abstract]

Net loss per common share (Tables)

	Three and nine months ended September 30, 2020		Three and nine months ended September 30, 2019
Stock options		—		480,000
Warrants to purchase shares of common stock		515,561,379		120,610,091
Convertible notes		4,964,723,277		94,933,731
		5,480,284,656		216,023,822