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Stockholders' Equity
 6 Months Ended
Jun. 30, 2023
Equity [Abstract]  
STOCKHOLDERS’ EQUITY STOCKHOLDERS’ EQUITY
Increase in Authorized Shares of Common Stock
In July 2022, following the approval of the Company's stockholders at its annual meeting of stockholders, the Company amended its restated certificate of incorporation to increase the Company's authorized shares of common stock to 240,000,000.
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. Shares of the Company's common stock sold under the agreement will be issued pursuant to the Company's shelf registration statement on Form S-3 (File No. 333-254862), the base prospectus included therein, originally filed with the SEC on March 30, 2021 and declared effective by the SEC on April 7, 2021, the prospectus supplement dated March 31, 2023 relating to the offering of up to $50.0 million of shares of the Company's common stock under the sales agreement, and any subsequent prospectus supplement related to the offering of shares of the Company's common stock under the sales agreement.
During the six months ended June 30, 2023, the Company sold 454,592 shares of common stock under this agreement and received aggregate gross proceeds of approximately $463,000 and incurred sales agent commissions and fees of approximately $11,000.
October 2021 ATM Sales Agreement
In October 2021, the Company entered into a sales agreement with SVB Securities LLC (formerly known as SVB Leerink LLC) to sell shares of its common stock from time to time through an ATM equity offering program under which SVB Securities acted as the Company's agent. The Company sold no shares of its common stock under the agreement during either of the six months ended June 30, 2023 or 2022. The Company terminated the agreement in March 2023.
April 2021 ATM Sales Agreement
In April 2021, the Company entered into a sales agreement with SVB Securities LLC to sell shares of its common stock from time to time through an ATM equity offering program under which SVB Securities acted as the Company's agent. The Company sold no shares of its common stock under the agreement during either of the six months ended June 30, 2023 or 2022. The Company terminated the agreement in March 2023.
Common Stock Warrants
In connection with an underwritten public offering in February 2018, the Company issued to the investors in that offering, warrants exercisable through February 2023 with an initial exercise price of $3.00 per share. The Company estimated the fair value of the warrants as of February 15, 2018 to be approximately $3.0 million which was recorded in equity as of the grant date. The warrants included a price-based anti-dilution provision, which provided that, subject to certain limited exceptions, the exercise price of the warrants would be reduced each time the Company issued or sold (or was deemed to have issued or sold) securities for a net consideration per share less than the exercise price of those warrants in effect immediately prior to such issuance or sale. In addition, subject to certain exceptions, if the Company issued, sold or entered into any agreement to issue or sell securities at a price which varied or may vary with the market price of the shares of the Company’s common stock, the warrant holders had the right to substitute such variable price for the exercise price of the warrant then in effect. In April 2019 and July 2020, in accordance with the price-based anti-dilution provision discussed above, the exercise price of these warrants was automatically reduced to $0.98 per share and to $0.96 per share, respectively. During the six months ended June 30, 2023, warrants to purchase 1,353,515 shares of common stock were exercised for gross proceeds of approximately $1.3 million and the remaining unexercised warrants expired on February 15, 2023. No warrants were exercised during the six months ended June 30, 2022.
As of June 30, 2023, the Company had the following warrants outstanding:
Shares Underlying
Outstanding Warrants		Exercise PriceExpiration Date
6,500$10.0004/04/2026
6,500