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Stockholders' Equity
 6 Months Ended
Jun. 30, 2024
Stockholders' Equity Note [Abstract]  
Stockholders' Equity Stockholders’ Equity
The following is a summary of the Company's authorized and issued common and preferred stock as of June 30, 2024 and December 31, 2023:
   Outstanding as of
 AuthorizedIssuedJune 30, 2024December 31, 2023
Common Stock, par value $0.001 per share
600,000,000 25,963,544 25,963,544 22,793,075 
Series C Preferred Stock, par value $0.001 per share
1,091 1,091 9 9 

Issuances of Common Stock and Pre-Funded Warrants
On April 18, 2024, the Company closed the Offering of Shares and Pre-Funded Warrants (see “Liquidity” in Note 2 above). As the Pre-Funded Warrants are indexed to the Company's own shares of common stock (and otherwise meet the requirements to be classified in equity), the Company recorded the consideration received from the issuance of the Pre-Funded Warrants as additional paid-in capital on the Company's condensed consolidated balance sheet as of June 30, 2024.
Each Pre-Funded Warrant has an initial exercise price per share of $0.001, subject to certain adjustments. The Pre-Funded Warrants may be exercised at any time until exercised in full. A holder (together with its affiliates and other attribution parties) may not exercise any portion of a Pre-Funded Warrant to the extent that immediately prior to or after giving effect to such exercise the holder would own more than 9.99% of the Company’s outstanding Common Stock immediately after exercise, which percentage may be changed at the holder’s election to a lower or higher percentage not in excess of 19.99% upon 61 days’ notice to the Company subject to the terms of the Pre-Funded Warrants. As of June 30, 2024, no Pre-Funded Warrants had been exercised.
On November 9, 2021, the Company entered into an ATM Equity OfferingSM Sales Agreement (the “2021 Sales Agreement”) with outside sales agents (collectively, the “Sales Agents”) for the offer and sale of its common stock for an aggregate offering price of up to $300.0 million. The 2021 Sales Agreement provides that the Sales Agents were entitled to compensation in an amount equal to up to 3.0% of the gross sales proceeds of any common stock sold through the Sales Agents under the 2021 Sales Agreement. During the three months ended March 31, 2024, the Company sold 543,620 shares of its common stock under the 2021 Sales Agreement at a weighted average price of $9.76 per share, resulting in aggregate net proceeds of $5.2 million. During the year ended December 31, 2023, the Company sold 875,305 shares of its common stock under the 2021 Sales Agreement at a weighted average price of $6.33 per share, resulting in aggregate net proceeds of $5.5 million. The registration statement relating to the shares of common stock issuable under the 2021 Sales Agreement has expired, and in August 2024 we terminated the 2021 Sales Agreement.
During the three months ended March 31, 2023, the Company issued 760,083 shares of common stock pursuant to the securities class action settlement, as described in Note 11.
Stock Options and Restricted Stock Units
The Board of Directors adopted the 2023 Omnibus Incentive Plan (the “2023 Plan”) on March 24, 2023, pursuant to which the Company may grant stock options, restricted stock awards, restricted stock units ("RSUs") and other stock-based awards or short-term cash incentive awards to employees, directors and consultants.
The 2023 Plan was approved by stockholders on May 16, 2023. The aggregate number of shares of the Company’s common stock that may be issued under the 2023 Plan will not exceed the sum of 1,166,666 shares plus any shares that may return from time to time from the 2016 Omnibus Incentive Plan (as amended, the “2016 Plan”) as a result of expirations, terminations or forfeitures of awards outstanding under the 2016 Plan as of May 16, 2023. At June 30, 2024, the Company had 800,051 shares of common stock available for future grant under the 2023 Plan, 188,804 shares underlying outstanding RSUs and 276,163 shares underlying options outstanding to purchase common stock under the 2023 Plan. The awards granted and available for future grant under the 2023 Plan generally vest over three years and have a maximum contractual term of ten years. The 2023 Plan terminates by its terms on March 24, 2033.
At June 30, 2024, the Company had 142,295 shares underlying outstanding but unvested RSUs and options outstanding to purchase 947,606 shares of common stock under the 2016 Plan. The outstanding awards granted under the 2016 Plan generally vest over three years and have a maximum contractual term of ten years. Following adoption of the 2023 Plan, no further awards may be made under the 2016 Plan, but outstanding awards continue to be governed by their existing terms.
On June 24, 2022, the Company's board of directors adopted a stock-based incentive plan (the "2022 Inducement Plan"), which provides for the discretionary grant of nonstatutory stock options, stock appreciation rights, restricted stock awards, RSU awards, performance awards, and other awards to individuals as a material inducement to entering into employment with the Company. The aggregate number of shares of the Company’s common stock that may be issued under the 2022 Inducement
Plan will not exceed 166,666 shares. At June 30, 2024, the Company had 110,527 shares of common stock available for future grant under the 2022 Inducement Plan, 10,274 shares underlying outstanding but unvested RSUs and options outstanding to purchase 38,318 shares of common stock under the 2022 Inducement Plan. The 2022 Inducement Plan can be terminated by the Company's board of directors at any time.
The Amended and Restated 2007 Omnibus Incentive Plan (the "2007 Incentive Plan") was adopted on March 31, 2007 and terminated by its terms on March 31, 2017. At June 30, 2024, the Company had options outstanding to purchase 97,618 shares of common stock under the 2007 Incentive Plan. The outstanding awards granted under the 2007 Incentive Plan are fully vested and generally have a maximum contractual term of ten years.