Warrants (Tables)

9 Months Ended

Sep. 30, 2020

Warrants [Abstract]

Warrant Activity

A summary of the warrant activity during the nine months ended September 30, 2020 is presented as follows:

Warrant class	Outstanding as of December 31, 2019		Issued		Exercised			Expired			Outstanding as of September 30, 2020
Class E Warrants		-		141,091,485		-			-			141,091,485
Class K Warrants		7,200,000		-		(7,200,000	)		-			-
Class O Warrants		909,091		-		-			-			909,091
Class P Warrants		1,365,000		-		(1,000,000	)		(100,000	)		265,000
LGH Warrant		-		1,750,000		-			-			1,750,000
NH Warrant		-		13,091,160		-			-			13,091,160
		9,474,091		155,932,645		(8,200,000	)		(100,000	)		157,106,736

Warrant Exercise Price Per Share and Expiration Date

A summary of the warrant exercise price per share and expiration date is presented as follows:

	Exercise price/share		Expiration date
Class E Warrants	$	0.25	August 2023
Class K Warrants	$	0.08	June 2025
Class K Warrants	$	0.11	August 2027
Class O Warrants	$	0.11	January 2022
Class P Warrants	$	0.20	June 2024
LGH Warrant	$	0.20	June 2025
NH Warrant	$	0.01	August 2030

Fair Value of Common Stock Purchase Warrants

The fair value of the common stock purchase warrants is estimated on the date of grant using the Black-Scholes option pricing model which approximates the binomial model using the following weighted average assumptions for the three and nine months ended September 30, 2020:

Weighted average contractual terms in years	1.3
Weighted average risk free interest rate	0.15	%
Weighted average volatility	92.76	%