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Equity Offerings (Tables) | 3 Months Ended
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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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- Definition 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 + Details
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