Equity Offerings (Tables)

6 Months Ended

Jun. 30, 2024

Equity Offerings

Schedule of Black-Scholes Model Based on Assumptions

	5/22/2020 Raise			8/3/2020 Raise			Series B			Series C
Risk-free interest rate		4.06	%		4.06	%		3.60	%		3.66	%
Volatility		135.35	%		132.55	%		115.42	%		127.65	%
Expected dividend yield		0.00	%		0.00	%		0.00	%		0.00	%
Expected life (in years)		2.4			2.6			6.5			4.5

Risk-free interest rate	3.66	%
Volatility	124.07	%
Expected dividend yield	0.00	%
Expected life (in years)	5.0

	Series F			Series G
Risk-free interest rate		3.8	%		3.4	%
Volatility		80.0	%		74.0	%
Expected dividend yield		0.0	%		0.0	%
Expected life (in years)		2.0			6.0

Schedule of issuance of warrants

Number of shares	Exercise Price	Expiration
3,300	$312.50	5 years
3,100	$175.00	5 years

Schedule of Black-Scholes Model Based on Assumptions for placement fees

Value ( $ in millions)	Expected Volatility	Risk-Free Interest Rate	Expected Dividend Yield	Expected Term (years)
$0.4	93.25%	1.81%	0%	5.0
$0.2	96.70%	2.87%	0%	5.0

Schedule of Warrants

Warrants outstanding, December 31, 2022	115,070
Issued	1,032,979
Exercised	(33,161	)
Expired	(10,671	)
Warrants outstanding, December 31, 2023	1,104,217
Issued	—
Exercised	—
Expired	—
Warrants outstanding, June 30, 2024	1,104,217

Schedule of common stock warrants outstanding

Warrant Type	Warrants Outstanding		Exercise Price		Expiration Date
May 2020 Warrants		1,275	$	5,625.00	5/20/2025
May 2020 Placement Agent Warrants		124	$	7,031.25	5/20/2025
August 2020 Warrants		1,943	$	4,375.00	8/3/2025
August 2020 Placement Agent Warrants		192	$	5,468.75	7/30/2025
August 2021 Pharos Banker Warrants		148	$	1,495.00	8/16/2026
February 2022 Series B Warrants		39,153	$	140.00	2/4/2029
July 2022 Series C Warrants		28,403	$	140.00	7/22/2027
January 2023 Series E Warrants		33,161	$	40.00	3/21/2028
March 2023 Series F Warrants		499,909	$	30.00	3/21/2025
March 2023 Series G Warrants		499,909	$	30.00	3/21/2029
		1,104,217