Share-based payments (Tables)

6 Months Ended

Jun. 30, 2019

Share-based payments (Tables)

Summary of financial statements related to equity-based payments

	Six months ended June 30,
	2019			2018
Nonemployee warrants fully-vested upon issuance	$	32,624		$	25,882
Nonemployee warrants service and performance conditions		--			--
Total share-based expense charged against income	$	32,624		$	25,882
Impact on net loss per common share:
Basic and diluted	$	(0.00	)	$	(0.00	)

Summary of Legal settlement - Replacement warrants

	Number of Warrants			Weighted-average Exercise Price		Weighted-average Remaining Life (Years)		Aggregate Intrinsic Value
Outstanding, December 31, 2018		13,445,836			0.27		1.4	$	78,000
Granted		1,300,000			0.05
Forfeited or expired		(5,510,000	)		0.51
Outstanding, June 30, 2019		9,235,836			0.10		1.7	$	194,500
Exercisable, June 30, 2019		9,235,836			0.10		1.7	$	194,500

Summary of fair value of common stock warrants

	6 Months Ended
	June 30, 2019
Volatility	133.5-133.7		%
Risk-free interest rate		2.4	%
Expected life (years)		5.0
Dividend yield		--