Series B Preferred Stock, Series B Preferred Stock Warrants

On October 16, 2023, the Company consummated a public offering (the “October Public Offering”) for an aggregate of 87,000 Series B Units (“Series B Units”). Each Series B Unit consists of one share of the Company’s Series B Preferred Stock and two warrants, each to purchase one share of Series B Preferred Stock (“Series B Preferred Stock Warrant”). Each share of Series B Preferred Stock is convertible at the holder’s option at any time, through a two-year period, into the number of shares of the Company’s common stock determined by dividing the $100 stated value per share of the Series B Preferred Stock by a conversion price of $62.205 per share. Each share of Series B Preferred Stock is convertible into 1 share of common stock, and each Series B Preferred Stock Warrant entitles the holder to purchase one share of Series B Preferred Stock at an initial exercise price of $55 per share. Dividends are paid in additional fully paid and nonassessable Series B Preferred Stock, at a 20% dividend rate, non-cumulative. If any shares of Series B Preferred Stock are outstanding at the end of the two-year period, the holder would be entitled to a cash redemption value equal to the $100 stated value per share. The gross proceeds from the sale of Series B Units were $4,785,000, before broker fees and related expenses of approximately $830,000.

Exercise of Series B Preferred Stock Warrants

On December 6, 2023, the Company executed an Inducement Agreement (the “Inducement Agreement”) with the holders of Series B Preferred Stock Warrants, modifying the exercise price to $35.72 per warrant. Any holder that exercises Series B Preferred Stock Warrants under the Inducement Agreement received a new Common Stock Warrant (“New Common Stock Warrants”) for each Series B Preferred Stock Warrant exercised. Each New Common Stock Warrant entitles the holder to purchase 2 shares of Common Stock at an initial exercise price of $22.23 per New Common Stock Warrant.

Due to certain price protections included with the New Common Stock Warrants, the warrants did not meet the criteria for equity classification and thus are subject to liability treatment. Total proceeds from the exercise of 61,613 Series B Preferred Stock Warrants of $2,264,000 through December 31, 2023, and the remaining fair value of the Series B Preferred Stock Warrant liability immediately prior to the exercise of $1,628,000 resulted in a total of $3,892,000 recorded for the new 61,613 shares of Series B Preferred Stock, of which $3,322,000 was allocated to the Common Stock Warrants liability based on their fair value and $569,000 was allocated to the Series B Preferred Stock using the residual method of allocation. In connection with this new issuance, the Company has recorded additional discounts to the Series B Preferred Stock for a beneficial conversion feature of $196,000, the Common Stock Warrants of $3,322,000 and issuance costs of $146,000. The Company also accretes to Series B Preferred Stock, against additional paid in capital as a deemed dividend, for the difference between the total proceeds of $35.72 per share of Series B Preferred Stock and the full redemption price of $100 per share. The Company uses the effective interest method to calculate the accretion amount for each period. All 61,613 New Common Stock Warrants issued as a result of the exercise of Series B Preferred Stock Warrants were outstanding as of December 31, 2023.

Issuance costs of $429,000 and $125,000 were expensed on the date of issuance of the Series B Preferred Stock Warrants and the New Common Stock Warrants, respectively as such warrants were recorded at fair value. Total issuance costs expensed from the issuances were charged to Change in fair value of warrant liabilities and amounted to $554,000.

Through various dates from issuance to December 31, 2023, the holders of 110,278 shares of Series B Preferred Stock converted their shares into 177,282 shares of Common Stock. Unamortized discounts to the Series B Preferred Stock of $6,063,000 were immediately recorded as a deemed dividend as of conversion date. Amortization and accretion of discounts from issuance date through December 31, 2023 amounted to $297,000, which were also recorded as a deemed dividend to the holders of Series B Preferred Stock. The total such deemed dividends amounted to $6,360,000 for the year ended December 31, 2023 and was recorded as a net loss available to common stockholders on the Company’s consolidated statement of operations.

The 38,335 shares of Series B Preferred Stock outstanding as of December 31, 2023, were to become mandatorily redeemable on October 15, 2025 in the amount of $3,833,500.

Through various dates during the three months ended March 31, 2024, holders of Series B Preferred Stock warrants exercised their warrants into 29,332 shares of Series B Preferred Stock at an exercise price of $35.72 per warrant. For each exercised Series B Preferred Stock Warrant, the holder received one share of Series B Preferred Stock and one New Common Stock Warrant. Each New Common Stock Warrant entitles the holder to purchase 2 shares of Common Stock at an initial exercise price of $22.23 per New Common Stock Warrant. Due to certain price protections included with the New Common Stock Warrants, the warrants did not meet the criteria for equity classification and thus are subject to liability treatment. Total proceeds from the exercise of the 29,332 Series B Preferred Stock Warrants amounted to $1,047,000, and the remaining fair value of the Series B Preferred Stock Warrant Liability immediately prior to the exercise of $587,000 resulted in a total of $1,634,000 recorded for the new 29,332 shares of Series B Preferred Stock, of which $1,188,000 was allocated to the New Common Stock Warrants liability based on their fair value and $446,000 was allocated to the Series B Preferred Stock using the residual method of allocation. In connection with this new issuance, the Company recorded additional discounts to the Series B Preferred Stock for the New Common Stock Warrants of $1,188,000 and issuance costs of $61,000. The Company also accretes to Series B Preferred Stock, against additional paid-in-capital as a deemed dividend, for the difference between the total proceeds of $35.72 per share of Series B Preferred Stock and the full redemption price of $100 per share. The Company uses the effective interest method to calculate the accretion amount for each period.

Issuance costs of $44,000 were expensed on the date of issuance of the New Common Stock Warrants, as such warrants were recorded at fair value.

Conversion of Series B Preferred Stock

Through various dates during the three months ended March 31, 2024, the holders of 5,000 shares of Series B Preferred Stock converted their shares into 8,038 shares of Common Stock. Unamortized discounts to the Series B Preferred Stock of $269,000 were immediately recorded as a deemed dividend as of conversion date.

February 2024 Series B Preferred Stock and Series B Preferred Stock Warrants Repurchase

On February 13, 2024, the Company and its Series B Preferred Stock and Series B Preferred Stock Warrants holders entered into an arrangement where the Company agreed to repurchase 62,657 Series B Preferred Stock shares and 81,315 Series B Preferred Stock warrants for a total of $6,266,000. Unamortized discounts to the Series B Preferred Stock of $5,381,000 were immediately recorded as a deemed dividend as of repurchase date. The remaining fair value of the Series B Preferred Stock Warrant Liability of $824,000 was adjusted against additional paid-in-capital on repurchase date.

Other Deemed Dividends

Amortization and accretion of discounts for all Series B Preferred Stock during the three months ended March 31, 2024 amounted to $192,000, which were also recorded as a deemed dividend to the holders of Series B Preferred Stock.

The total of deemed dividends (as discussed in this section, the Conversion of Series B Preferred Stock and February 2024 Series B Preferred Stock and Series B Preferred Stock Warrants Repurchase sections above) amounted to $5,842,000 for the three months ended March 31, 2024 and was recorded as an adjustment to net loss available to common stockholders on the Company’s condensed consolidated statement of operations.

Common Stock

2018 Long Term Stock Incentive Plan

On January 30, 2018, the Company’s board of directors approved the establishment of the Company’s 2018 Long-Term Stock Incentive Plan (the “LTIP”) and termination of its Carve-Out Plan. Under the LTIP, the aggregate maximum number of shares of common stock (including shares underlying options) that may be issued under the LTIP pursuant to awards of Restricted Shares or Options will be limited to 15% of the outstanding shares of common stock, which calculation shall be made on the first trading day of each new fiscal year; provided that, in any year no more than 8% of the common stock or derivative securitization with common stock underlying 8% of the common stock may be issued in any fiscal year. At a Special Meeting of Stockholders on January 24, 2023, the Company’s stockholders approved certain amendments to the LTIP to: (i) increase the annual share limit of Common Stock that may be issued in any single fiscal year only for the 2023 fiscal year under the LTIP from 8% of the shares of Common Stock outstanding to 15% of the shares of Common Stock outstanding (which amount equates to the maximum amount that may be issued in the aggregate under the LTIP), and (ii) permit immediately quarterly calculations based on the number of shares of Common Stock outstanding as of the first trading day of each fiscal quarter, rather than solely as of the first trading day of the fiscal year. At a Special Meeting of Stockholders on March 15, 2024, the Company’s stockholders further approved an amendment to the LTIP to increase the annual share limit of Common Stock that may be issued only for the 2024 fiscal year under the LTIP from 8% of the shares of Common Stock outstanding to 15% of the shares of Common Stock outstanding (which amount equates to the maximum amount that may be issued in the aggregate under the LTIP). As of March 31, 2024, up to 263,570 shares of common stock are available for participants under the LTIP.

A summary of activity related to restricted stock awards for the three months ended March 31, 2024 is presented below:

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As of March 31, 2024, the unamortized compensation costs related to the unvested restricted stock awards was approximately $1,138,000 which is to be amortized on a straight-line basis over a weighted-average period of approximately 0.7 years.

For the three months ended March 31, 2024, 20 shares of restricted stock units were released under the LTIP with an intrinsic value of less than $1,000. For the three months ended March 31, 2023, no shares of restricted stock issued under the LTIP, were released.

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2020 Stock Incentive Plan

A summary of activity related to restricted stock units under the Company’s 2020 Stock Incentive Plan for the three months ended March 31, 2024 is presented below:

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As of March 31, 2024, there was no unamortized compensation costs.

For the three months ended March 31, 2024, 1 share of restricted stock units was released under the 2020 Stock Incentive Plan with an intrinsic value of less than $1,000. For the three months ended March 31, 2023, no shares of restricted stock, issued under the 2020 Stock Incentive Plan, were released.

Inducement Grant

On September 13, 2021, the Company issued 21 shares of restricted common stock to Eric Almgren, the Company’s Chief Strategist, as an inducement grant (“September 2021 Inducement Grant”). As of March 31, 2024, the unamortized compensation cost related to the unvested September 2021 Inducement Grant was approximately $121,000 which is being amortized on a straight-line basis over a period of approximately 0.5 years. The Company recorded stock-based compensation of $64,000 related to this grant for three months ended March 31, 2024. As of March 31, 2024, 16 shares are unvested.

For the three months ended March 31, 2024, no shares of restricted stock were released under the September 2021 Inducement Grant.

2022 Plan

A summary of activity related to restricted stock units under the Company’s Technical Team Retention Plan of 2022 (the “2022 Plan”) for the three months ended March 31, 2024 is presented below:

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As of March 31, 2024, the unamortized compensation cost related to the unvested restricted stock units was approximately $106,000 which is to be amortized on a straight-line basis over a weighted-average period of approximately 2.2 years.

For the three months ended March 31, 2024, 3 shares of restricted stock units were released under the 2022 Plan with an intrinsic value of less than $1,000. For the three months ended March 31, 2023, no shares of restricted stock units were released under the 2022 Plan.

February 2023 Offering

On January 31, 2023, the Company entered into a securities purchase agreement with certain institutional investors, pursuant to which the Company agreed to issue and sell to such investors (i) in a registered direct offering, 1,344 shares of common stock and pre-funded warrants (the “February 2023 Pre-Funded Warrants”) to purchase up to 2,545 shares of common stock, at an exercise price of $0.015 per share of common stock, and (ii) in a concurrent private placement, common stock purchase warrants, exercisable for an aggregate of up to 5,833 shares of common stock, at an initial exercise price of $1,573.50 per share of common stock (the “February 2023 Offering”). In February and March of 2023, all the February 2023 Pre-Funded Warrants were exercised for cash.

On February 3, 2023, the Company closed the February 2023 Offering, and received net proceeds of approximately $5.3 million after deducting placement agent fees and other offering expenses payable by the Company.

Also, in connection with the February 2023 Offering, on January 31, 2023, the Company entered into a placement agency agreement with Maxim, pursuant to which Maxim agreed to act as placement agent on a “best efforts” basis in connection with the offering and (ii) the Company agreed to pay Maxim an aggregate fee equal to 8.0% of the gross proceeds raised in the offering.

Also in connection with the February 2023 Offering, the Company entered into an amendment (the “Amendment”) to the securities purchase agreement, dated as of November 29, 2022, by and between the Company and certain institutional investors (the “November Purchase Agreement”) approved by a certain investor (the “November Investor”) who purchased at least 50.1% in interest of the shares of Common Stock and the pre-funded warrants to purchase shares of Common Stock, if any, based on the initial subscription amounts under the November Purchase Agreement, pursuant to Section 5.5 of the November Purchase Agreement. Pursuant to the Amendment, Section 4.11 of the November Purchase Agreement, which prohibits the Company’s ability to issue shares of Common Stock or Common Stock Equivalents (as defined in the November Purchase Agreement) or filing any registration statement or amendment or supplement thereto under the Securities Act, until ninety (90) days after the closing date of the transactions contemplated by the November Purchase Agreement, was amended to permit the offering discussed above and the issuance and sale of the securities offered and sold in such offering.

March 2023 Offering

On March 27, 2023, the Company entered into a securities purchase agreement with certain institutional investors, pursuant to which the Company agreed to issue and sell to such investors (i) in a registered direct offering, 5,581 shares of common stock of the Company and (ii) in a concurrent private placement, common stock purchase warrants, exercisable for an aggregate of up to 11,163 shares of common stock, at an initial exercise price of $286.50 per share (the “March 2023 Offering”).

On March 29, 2023, the Company closed the March 2023 Offering and received net proceeds of approximately $1.6 million, after deducting fees payable to the financial advisor and other offering expenses.

April 2023 Offering

On April 7, 2023, the Company entered into a securities purchase agreement with certain institutional investors, pursuant to which the Company issued and sold to such investors (i) in a registered direct offering, 4,954 shares of common stock of the Company and (ii) in a concurrent private placement, common stock purchase warrants exercisable for an aggregate of up to 9,908 shares of Common Stock, at an initial exercise price of $211.50 per share of Common Stock (the “April 2023 Offering”).

On April 12, 2023, the Company closed the April 2023 Offering and received net proceeds of approximately $1.0 million, after deducting fees payable to the financial advisor and other offering expenses.

October 2023 Warrant Repurchase

On October 16, 2023, the Company and certain of its common stock warrants holders entered into an arrangement where the Company agreed to repurchase outstanding common stock purchase warrants exercisable for an aggregate of up to 30,978 shares of Common Stock, at an exercise prices ranging from $193.50 to $286.50 per share of Common Stock for a total of $2,323,000. The repurchased warrants were previously classified as equity warrants and at the date of repurchase a charge was recorded to additional paid-in capital.

February 2024 Issuance of Common Stock and Pre-Funded Common Stock Warrants

On February 13, 2024, the Company consummated a public offering (the “February Public Offering”) of 158,227 units (the “February Units”) and 867,373 pre-funded units (the “February Pre-Funded Units”). Each February Unit was issued at $9.75 per unit and included one share of common stock and one common stock warrant (the “February Common Warrants”) exercisable for one share of common stock at a $9.75 exercise price. Each February Pre-Funded Unit was issued at $9.735 per unit and included one pre-funded common stock warrant (the “February Pre-Funded Warrants”), exercisable for one share of common stock at an initial exercise price of $0.015 and one February Common Warrant. The gross proceeds from the issuance of the February Units and the February Pre-Funded Units was $1,543,000 and $8,444,000, respectively, for total aggregate proceeds of $9,987,000 before broker fees and related expenses of approximately $998,000. As a result of certain price protection clauses, the February Common Warrants did not meet the criteria for equity classification and thus are subject to liability treatment. Accordingly, of the $9,987,000 gross proceeds from the February public offering, an amount of $6,308,000, representing the fair value of the February Common Warrants as of the issuance date was allocated to the February Common Warrants liability, with the residual proceeds of $3,679,000 allocated to the Common Stock and February Pre-Funded Warrants, which met the criteria for equity classification.

Of the gross broker fees and related expenses of approximately $998,000, the Company allocated $368,000 to the issued Common Stock and February Pre-Funded Warrants, which were recorded as a reduction of additional paid-in-capital. The remaining issuance cost of $630,000 was allocated to the February Common Warrants and was expensed on the date of issuance as such warrants were recorded at fair value.

March 2024 Issuance of Common Stock, Prefunded Common Stock Warrants and Common Stock Warrants

On March 26, 2024, the Company entered into a Securities Purchase Agreement with certain purchasers where the Company issued 417,833 shares of common stock, 93,342 pre-funded common stock warrants (the “March Pre-Funded Warrants”) and common stock warrants (the “March Common Warrants”) to purchase up to 511,175 shares of common stock at an initial exercise price of $6.00 per share (known in aggregate as the “March 2024 Offering”). Total proceeds per the Securities Purchase Agreement amounted to $2,299,000 before broker fees and other related expenses of approximately $388,000. As a result of certain price protection clauses, the March Common Warrants did not meet the criteria for equity classification and thus are subject to liability treatment. Accordingly, of the $2,299,000 gross proceeds from the March public offering, an amount of $1,227,000, representing the fair value of the March Common Warrants as of the issuance date was allocated to the March Common Warrants liability, with the residual proceeds of $1,072,000 allocated to the Common Stock and March Pre-Funded Warrants, which met the criteria for equity classification.

Of the gross broker fees and related expenses of approximately $388,000, the Company allocated $181,000 to the issued Common Stock and the March Pre-Funded Warrants, which were recorded as a reduction of additional paid-in-capital. The remaining issuance cost of $207,000 was allocated to the March Common Warrants and was expensed on the date of issuance as such warrants were recorded at fair value.

Warrants for Shares of Common Stock

A summary of the warrant activity and related information for the three months ended March 31, 2024 and the year ended 2023 is provided as follows.

In connection with February 2023 Offering, the Company issued common stock purchase warrants to investors to purchase up to 5,833 shares of the Company’s common stock, at an initial exercise price of $1,573.50 per share. The grant date fair value of such warrants was $5,600,000, which was recorded as a liability with the offset recorded to additional paid-in capital on the condensed consolidated balance sheets. The fair value of such warrants was determined using the Black-Scholes Model based on the following weighted average assumption: common stock price on the date of grant of $1,335.00; expected yield of 0.0%; expected volatility of 96%; risk-free interest rate of 3.67% and expected life of 5 years.

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In connection with March 2023 Offering, the Company issued common stock purchase warrants to investors to purchase up to 11,163 shares of the Company’s common stock, at an initial exercise price of $286.50 per share. The grant date fair value of such warrant was $2,113,000, which was recorded as equity. The fair value of such warrants was determined using the Black-Scholes Model based on the following weighted average assumption: common stock price on the date of grant of $249.00; expected yield of 0.0%; expected volatility of 104%; risk-free interest rate of 3.67% and expected life of 5 years.

May 2023 Warrant Inducement

On May 15, 2023, the Company entered into warrant exercise inducement offer letters (the “May Inducement Letters”) with the holders of common stock purchase warrants exercisable for an aggregate of up to 9,907 shares of common stock at an initial exercise price of $211.50 per share issued on April 12, 2023 (the “April Warrants”). The April Warrant holders agreed to exercise for cash April Warrants to purchase up to 9,907 shares of common stock in exchange for the Company’s agreement to issue 19,815 new warrants (the “May Inducement Warrants”) on substantially the same terms as the April Warrants. The Company received net proceeds of approximately $1.9 million from the exercise of the April Warrants. Each May Inducement Warrant is exercisable at a price per share of common stock of $199.50, which was equal to the Minimum Price (as defined by the Nasdaq Listing Rules).

Each May Inducement Warrant is immediately exercisable upon issuance and will expire on the fifth anniversary of its issuance. The exercise price of the May Inducement Warrants is subject to appropriate adjustment in the event of recapitalization events, stock dividends, stock splits, stock combinations, reclassifications, reorganizations or similar events affecting the Company’s common stock. The May Inducement Warrants are callable by the Company at a redemption price of $75.00 per May Inducement Warrant, provided that the resale of the shares of common stock underlying the May Inducement Warrants are then registered or may be resold under Rule 144 under the Securities Act.

July 2023 Warrant Inducement

On July 26, 2023, the Company entered into warrant exercise inducement offer letters (the “July Inducement Letters”) with holders of the May Inducement Warrants pursuant to which the Company agreed to issue new inducement warrants (the “July Inducement Warrants”) to purchase a number of shares of Common Stock equal to 100% of the number of shares of Common Stock received upon exercise of the May Inducement Warrants during the period provided for in the July Inducement Letters, with such July Inducement Warrants to be issued on substantially the same terms as the May Inducement Warrants. The holders exercised 3,400 May Inducement Warrants pursuant to certain of the July Inducement Letters, and the Company received aggregate gross proceeds of approximately $678,000 from such exercises. In exchange for the exercises of the May Inducement Warrants, the Company issued July Inducement Warrants exercisable for an aggregate of up to 3,400 shares of common stock at an initial exercise price of $193.50 per share. The inducement offering period closed at 5:00 p.m. EDT on August 8, 2023.

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Each July Inducement Warrant was immediately exercisable upon issuance and will expire on the fifth anniversary of its issuance. The exercise price of the July Inducement Warrants is subject to appropriate adjustment in the event of recapitalization events, stock dividends, stock splits, stock combinations, reclassifications, reorganizations or similar events affecting the Company’s common stock. The July Inducement Warrants are callable by the Company at a redemption price of $75.00 per July Inducement Warrant, provided that the resale of the shares of common stock underlying the July Inducement Warrants are then registered or may be resold under Rule 144 under the Securities Act.

During the three months ended March 31, 2023, 18 warrants to purchase common stock were exercised for cash, resulting in proceeds of approximately $32,000. In addition, during the three months ended March 31, 2023, 7,454 warrants were exercised using an alternative cashless exercise provision, resulting in the issuance 5,705 shares of common stock.

In connection with January 2024 Promissory Notes, the Company issued common stock purchase warrants to investors to purchase up to 66,665 shares of the Company’s common stock, at an initial exercise price of $22.23 per share. The grant date fair value of such warrant was $860,000, which was recorded as a liability with the offset recorded to additional paid-in capital on the condensed consolidated balance sheets. The fair value of such warrants was determined using the Black-Scholes Model based on the following weighted average assumption: common stock price on the date of grant of $15.99; expected yield of 0.0%; expected volatility of 119%; risk-free interest rate of 4.31% and expected life of 5 years.

In connection with February Public Offering, the Company issued common stock purchase warrants to investors to purchase up to 1,025,600 shares of the Company’s common stock, at an initial exercise price of $9.75 per share. The grant date fair value of such warrant was $6,308,000, which was recorded as a liability with the offset recorded to additional paid-in capital on the condensed consolidated balance sheets. The fair value of such warrants was determined using the Black-Scholes Model based on the following weighted average assumption: common stock price on the date of grant of $7.62; expected yield of 0.0%; expected volatility of 119%; risk-free interest rate of 4.31% and expected life of 5 years.

In connection with March 2024 Offering, the Company issued common stock purchase warrants to investors to purchase up to 511,175 shares of the Company’s common stock, at an initial exercise price of $6.00 per share. The grant date fair value of such warrant was $1,227,000, which was recorded as a liability with the offset recorded to additional paid-in capital on the condensed consolidated balance sheets. The fair value of such warrants was determined using the Black-Scholes Model based on the following weighted average assumption: common stock price on the date of grant of $3.18; expected yield of 0.0%; expected volatility of 119%; risk-free interest rate of 4.21% and expected life of 5 years.

On March 26, 2024, the Company entered into a warrant amendment agreement (the “Warrant Amendment Agreement”) with certain holders of (i) the New Common Stock Warrants, (ii) the common stock purchase warrants dated January 23, 2024 (the “January 2024 Warrants”), and (iii) the February Common Warrants (together with the New Common Stock Warrants and the January 2024 Warrants, the “Original Warrants”), whereby the holders agreed to (i) amend the New Common Stock Warrants and the January 2024 Warrants so such warrants shall not be exercisable until one or more certificates of amendment to the Company’s certificate of incorporation, as amended, are filed with the Secretary of State of the State of Delaware to effectuate an increase in authorized shares of capital stock of the Company and a reverse stock split of the Company’s outstanding shares of common stock; and (ii) remove certain exercise price reset, right to reprice and/or share adjustment provisions in the Original Warrants, to be effective following the first adjustments following the April 2024 Reverse Stock Split.

During the three months ended March 31, 2024, and excluding the exercise of pre-funded warrants, no warrants to purchase common stock were exercised for cash or using the alternative cashless exercise provision.

6.Convertible Redeemable Preferred Stock and Stockholders’ Equity, continued

Information regarding warrants for common stock outstanding and exercisable as of March 31, 2024 is as follows:

Warrants exercisable as of March 31, 2024 exclude warrants to purchase 1 share of common stock issued to a marketing firm, which vest upon the achievement of certain milestones and warrants to purchase 1,536,775 shares of common stock issued to investors that participated in the February Public Offering and March 2024 Offering that requires shareholder approval prior to the warrants being exercisable.

Information regarding warrants for common stock outstanding and exercisable as of December 31, 2023 is as follows:

Warrants exercisable as of December 31, 2023 exclude warrants to purchase 1 shares of common stock issued to a marketing firm, which vest upon the achievement of certain milestones and warrants to purchase 187,557 shares of common stock issued to investors that participated in the Inducement Agreement that requires shareholder approval prior to the warrants being exercisable.