Warrants to Purchase Common Stock (Tables)

3 Months Ended

Mar. 31, 2020

Notes to Financial Statements

Summary of activity related to warrants

A summary of activity related to warrants for the three months ended March 31, 2020 follows:

	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term
Outstanding at January 1, 2020		4,531,924	$	0.72		4.05
Outstanding at March 31, 2020		4,531,924		0.72		3.80
Exercisable at March 31, 2020		4,531,924		0.72		3.80

A summary of activity related to warrants for the three months ended March 31, 2019 follows:

	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term
Outstanding at January 1, 2019		4,531,924	$	0.72		5.05
Outstanding at March 31, 2019		4,531,924		0.72		5.05
Exercisable at March 31, 2019		4,531,924		0.72		5.05