Warrants to Purchase Common Stock (Tables)

12 Months Ended

Dec. 31, 2019

Notes to Financial Statements

Summary of activity related to warrants

A summary of activity related to warrants for the year ended December 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 December 31, 2019		4,531,924	$	0.72		5.05
Exercisable at December 31, 2019		4,531,924	$	0.72		4.05

A summary of activity related to warrants for the twelve months ended December 31, 2018 follows:

	Shares		Weighted- Average Exercise Price ($)		Weighted-Average Remaining Contractual Term
Outstanding at January 1, 2017		828,221	$	1.51		5.34
Granted		3,703,703	$	0.54		4.99
Outstanding at December 31, 2018		4,531,924	$	0.72		5.05
Exercisable at December 31, 2018		4,531,924	$	0.72		5.05