Net loss per common share (Tables)

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Net loss per common share (Tables)

For the three months ended March 31, 2021 and 2020, the following options, warrants and convertible securities were excluded from the computation of diluted net loss per share as the results would have been anti-dilutive.

	Three months ended March 31, 2021		Three months ended March 31, 2020
Warrants to purchase shares of common stock		926,470,474		154,455,397,549
Convertible notes		662,500,729		48,756,889,839
		1,588,971,203		203,212,287,388