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Equity Offerings (Tables)

3 Months Ended

Mar. 31, 2024

Equity Offerings

Schedule of Black-Scholes Model Based on Assumptions

		5/22/2020 Raise				8/3/20 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
33,000		$31.25		5 years
31,000		$17.50		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			1,150,658
Issued			10,329,794
Exercised			(331,608	)
Expired			(106,707	)
Warrants outstanding, December 31, 2023			11,042,137
Issued			—
Exercised			—
Expired			—
Warrants outstanding, March 31, 2024			11,042,137

Schedule of common stock warrants outstanding

Warrant Type		Warrants Outstanding				Exercise Price				Expiration Date
May 2020 Warrants			12,743			$	562.50			5/20/2025
May 2020 Placement Agent Warrants			1,244			$	703.13			5/20/2025
August 2020 Warrants			19,407			$	437.50			8/3/2025
August 2020 Placement Agent Warrants			1,918			$	546.88			7/30/2025
August 2021 Pharos Banker Warrants			1,484			$	149.50			8/16/2026
February 2022 Series B Warrants			391,527			$	14.00			2/4/2029
July 2022 Series C Warrants			284,020			$	14.00			7/22/2027
January 2023 Series E Warrants			331,608			$	4.00			3/21/2028
March 2023 Series F Warrants			4,999,093			$	3.00			3/21/2025
March 2023 Series G Warrants			4,999,093			$	3.00			3/21/2029
			11,042,137

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 718
-SubTopic 10
-Subparagraph (f)(2)
-Name Accounting Standards Codification
-Paragraph 2
-Section 50
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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