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| Stockholders' Equity | STOCKHOLDERS’ EQUITY Equity Line On October 21, 2024, the Company entered into a purchase agreement and registration rights agreement with Lincoln Park Capital Fund, LLC, or Lincoln Park. Under the terms and subject to the conditions of the purchase agreement, the Company has the right, but not the obligation, to sell to Lincoln Park, and Lincoln Park is obligated to purchase, up to $15.0 million of shares of the Company’s common stock. Sales of such shares by the Company, if any, are subject to certain limitations, and may occur from time to time, at the Company’s sole discretion, over the 24-month period commencing on November 27, 2024, which is referred to as the "Commencement Date." From time to time after the Commencement Date, at the Company’s sole discretion, on any business day selected by the Company on which the closing sale price of the Company’s common stock is not below $0.50 per share, the Company may direct Lincoln Park to purchase up to 30,000 shares of the Company’s common stock (or up to 35,000 and 40,000 shares if the closing sale price of the Company’s common stock on the day on which the Company initiates a purchase is not below $5.00 or $7.50, respectively, subject to customary adjustments for stock splits and similar transactions) at a purchase price equal to the lower of (i) the lowest sale price of the Company’s common stock on the business day on which the Company initiates the purchase and (ii) the average of the three lowest closing sale prices of the Company’s common stock during the 10-business day period immediately preceding the business day on which the Company initiates the purchase. However, Lincoln Park’s maximum commitment in any single purchase may not exceed $500,000. In addition, the Company may also direct Lincoln Park to purchase other amounts of common stock as accelerated purchases and as additional accelerated purchases, subject to limits specified in the purchase agreement, at a purchase price per share calculated as specified in the purchase agreement, but in no case lower than the minimum price per share the Company stipulates in its notice to Lincoln Park initiating these purchases. In addition, under applicable Nasdaq rules, the Company may not issue or sell to Lincoln Park under the purchase agreement more than 1,711,172 shares of the Company’s common stock, which is referred to as the Exchange Cap, unless (i) the Company obtains stockholder approval to issue shares in excess of the Exchange Cap or (ii) the average price of all applicable sales of the Company’s common stock to Lincoln Park under the purchase agreement equals or exceeds $3.59 per share (which represents the lower of (A) the official closing price per share of the Company’s common stock on Nasdaq immediately preceding the signing of the purchase agreement and (B) the average official closing price of the Company’s common stock on Nasdaq for the five consecutive trading days ending on the trading day immediately preceding the date of the purchase agreement). The Company may also not sell shares to Lincoln Park under the purchase agreement if it would result in Lincoln Park beneficially owning more than 4.99% of the Company’s then outstanding shares of common stock, which limitation is referred to as the beneficial ownership cap. Lincoln Park, upon written notice to the Company, may increase the beneficial ownership cap to up to 9.99%. Any increase in the beneficial ownership cap will not be effective until the 61st day after such written notice is delivered to the Company. In connection with entering into the purchase agreement, the Company issued 137,614 shares of its common stock to Lincoln Park in consideration for its commitment to purchase shares thereunder. During the three months ended March 31, 2025, the Company sold 150,000 shares of common stock under this agreement for net proceeds of approximately $0.4 million. March 2023 ATM Sales Agreement In March 2023, the Company entered into a sales agreement with Stifel, Nicolaus & Company, Incorporated, or Stifel, and Cantor Fitzgerald & Co., or Cantor, to sell shares of its common stock from time to time through an "at-the-market," or ATM, equity offering program under which Stifel and Cantor act as the Company's agent. The Company agreed to pay a commission equal to 3% of the gross proceeds of any common stock sold under the agreement or such lower amount as the Company and Stifel and Cantor agree, plus certain legal expenses. In April 2024, the Company and Cantor mutually agreed to terminate the sales agreement with respect to Cantor. During the three months ended March 31, 2025 and 2024, the Company sold 0 and 50,664 shares of common stock under this agreement, respectively. Common Stock Warrants December 2023 Warrant In connection with the royalty interest financing agreement the Company entered into in December 2023 (see Note 7), the Company issued a warrant to purchase up to an aggregate of 422,805 shares of the Company's common stock. The warrant has a term of five years from the date of issuance and an exercise price of $4.10 per share, subject to customary adjustment for stock splits and similar transactions. The holder (together with its affiliates) may not exercise any portion of the warrant to the extent that the holder would own more than 4.99% (or, at the election of the holder 9.99%) of the Company's outstanding common stock immediately after exercise. The warrant includes certain rights in favor of the holder upon a “fundamental transaction” as described in the warrant, including the right of the holder to receive from the Company or the successor entity the number of shares of common stock of the Company or the successor entity that would have been issuable upon exercise of the warrant immediately prior to such transaction and any additional consideration receivable as a result of such transaction by the Company's stockholders, without regard to any limitation on the exercise of the warrant. The warrant may be exercised for cash, or if at the time of exercise there is no effective registration statement registering for resale the shares underlying the warrant, then in lieu of paying the exercise price in cash, the holder may elect to exercise on a cashless basis. The warrant was deemed to be an equity classified warrant and recorded as additional paid in capital. As of March 31, 2025, no portion of the warrant had been exercised. September 2023 Warrants In connection with a registered direct offering completed in September 2023, the Company issued warrants to purchase up to an aggregate of 845,225 shares of the Company's common stock. The warrants became exercisable on March 1, 2024, expire March 1, 2029 and have an exercise price of $9.11 per share, subject to customary adjustment for stock splits and similar transactions. A holder (together with its affiliates) may not exercise any portion of a warrant to the extent that the holder would own more than 4.99% (or, at the election of the holder 9.99%) of the Company's outstanding common stock immediately after exercise. The warrants include certain rights in favor of the holders upon a “fundamental transaction” as described in the warrants, including the right of the holders to receive from the Company or the successor entity an amount of cash equal to the Black-Scholes value (as described in the warrants) of the unexercised portion of the warrants on the date of the consummation of such fundamental transaction. As of March 31, 2025, none of the warrants have been exercised. Summary of Warrant Activity A summary of warrant activity during the three months ended March 31, 2025 is presented below:
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