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Stockholders' Equity
 12 Months Ended
Dec. 31, 2024
Equity [Abstract]  
Stockholders' Equity . Stockholders' Equity
Preferred Stock
Our certificate of incorporation authorizes us to issue up to 10,000,000 shares of preferred stock with $0.001 par value per share. There were no shares of preferred stock issued or outstanding as of December 31, 2024 and 2023. Our board of directors (“Board”) are authorized to provide for the issue of all or any of the shares of preferred stock in one or more series, and to fix, determine or alter the voting powers, designation, preferences and rights of the preferred shares, and the qualifications, limitations or restrictions of any wholly unissued shares, to establish from time to time the number of shares constituting any such series, and to increase or decrease the number of shares, if any. Holders of outstanding shares of preferred stock shall be entitled to receive dividends, when, and as declared by the Board in preference and priority to any declaration or payment of any distribution on common stock. The right to receive dividends on preferred shares of preferred stock shall not be cumulative and no right to dividends shall accrue to holders of preferred stock. No dividends have been paid or declared as of December 31, 2024 and 2023.
Common Stock
Our certificate of incorporation authorizes us to issue up to 500,000,000 shares of common stock with $0.001 par value per share, of which 124,893,034 and 95,364,831 shares were issued and outstanding as of December 31, 2024 and 2023, respectively. The holders of our common stock are also entitled to receive dividends whenever funds are legally available, when and if declared by our Board. As of December 31, 2024 and 2023, no dividends have been declared.
ATM Program
In July 2021, we entered into an Open Market Sales Agreement℠ (the “Original ATM Sales Agreement”) with Jefferies LLC (“Jefferies”) to issue and sell, from time to time at our discretion, shares of our common stock at an aggregate offering price up to $150.0 million through Jefferies acting as our sales agent or principal, however, we are not obligated to make any sales of common stock. As of February 27, 2023, we had sold 4,995,709 shares of our common stock under the Original ATM Sales Agreement at a weighted average price of $27.57 per share for aggregate gross proceeds of $137.8 million. On February 27, 2023, we and Jefferies entered into an amendment to the Original ATM Sales Agreement (as amended, the “Amended ATM Sales Agreement”) to offer and sell additional shares of our common stock with an aggregate offering price up to another $400.0 million, which is in addition to the $150.0 million aggregate offering price under the Original ATM Sales Agreement. As of December 31, 2024, we have sold 4,211,367 shares of our common stock under the Amended ATM Sales Agreement at a weighted average price of $64.19 per share for aggregate gross proceeds of $270.3 million, or $264.2 million net of commissions and offering expenses, with $129.7 million remaining for future sales under the Amended ATM Sales Agreement. The gross proceeds of the shares sold net of commission and related offering expenses are reflected as an addition to common stock and additional paid-in capital on our consolidated balance sheets.
The following table summarizes the share activity under the Original and Amended ATM Sales Agreements:
Year Ended December 31,
202420232022
Number of shares sold under the ATM program
2,622,5602,095,9433,921,528 
Weighted average sales price per share
$76.39 $44.38 $25.60 
Aggregate gross proceeds, in thousands (1)
$200,333 $92,976 $100,402 
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(1)Includes $4.4 million, $2.2 million and $3.1 million of commissions and offering expenses during the years ended December 31, 2024, 2023 and 2022, respectively.

Underwritten Follow-on Public Offerings
On January 13, 2022, we completed an underwritten public offering in which we issued 2,500,000 shares of our common stock at a price of $20.00 per share and pre-funded warrants to purchase 2,500,000 shares of our common stock at a price of $19.999 per underlying share. Each pre-funded warrant has an exercise price of $0.001 per share. In February 2022, the underwriters exercised their option to purchase an additional 750,000 shares of common stock. In aggregate, we received $107.6 million in net proceeds after deducting issuance costs, and excluding the exercise of any pre-funded warrants.
On October 28, 2022, we completed an underwritten public offering of 17,812,500 shares of our common stock, which included the full exercise of the underwriters’ option to purchase an additional 2,812,500 shares, at a price of $32.00 per share and pre-funded warrants to purchase 3,750,000 shares of our common stock at a price of $31.999 per underlying share. Each pre-funded warrant has an exercise price of $0.001 per share. In aggregate, we received $651.6 million in net proceeds after deducting issuance costs, and excluding the exercise of any pre-funded warrants.
On April 21, 2023, we completed an underwritten public offering of 13,030,000 shares of our common stock, which included the full exercise of the underwriters’ option to purchase an additional 1,830,000 shares, at a price of $41.00 per share and pre-funded warrants to purchase 1,000,000 shares of our common stock at a price of $40.999 per underlying share. Each pre-funded warrant has an exercise price of $0.001 per share. In aggregate, we received $545.3 million in net proceeds after deducting issuance costs, and excluding the exercise of any pre-funded warrants.
On February 2, 2024, we completed an underwritten public offering of 12,695,312 shares of our common stock, which included the full exercise of the underwriters’ option to purchase an additional 1,757,812 shares, at a price of $64.00 per
share and pre-funded warrants to purchase 781,250 shares of our common stock at a price of $63.999 per underlying share. Each pre-funded warrant has an exercise price of $0.001 per share. In aggregate, we received $816.5 million in net proceeds after deducting issuance costs, and excluding the exercise of any pre-funded warrants.
On September 6, 2024, we completed an underwritten public offering of 12,087,378 shares of our common stock, which included the full exercise of the underwriters’ option to purchase an additional 1,893,203 shares, at a price of $103.00 per share and pre-funded warrants to purchase 2,427,184 shares of our common stock at a price of $102.999 per underlying share. Each pre-funded warrant has an exercise price of $0.001 per share. In aggregate, we received $1.4 billion in net proceeds after deducting issuance costs, and excluding the exercise of any pre-funded warrants.
The pre-funded warrants are exercisable, at the option of each holder, in whole or in part by delivering to us a duly executed exercise notice and payment of the exercise price. No fractional shares of common stock will be issued in connection with the exercise of a pre-funded warrant. The holders of the pre-funded warrants may also satisfy their obligation to pay the exercise price through a “cashless exercise,” in which the holder receives the net value of the pre-funded warrant in shares of common stock determined according to the formula set forth in the pre-funded warrant.
The pre-funded warrants will not expire until they are fully exercised. However, we may not effect the exercise of any pre-funded warrants, and a holder will not be entitled to exercise any portion of any pre-funded warrants that, upon giving effect to such exercise, would cause: (i) the aggregate number of shares of our common stock beneficially owned by such holder (together with affiliates) to exceed 4.99% or 9.99% of the number of shares of our common stock outstanding immediately after giving effect to the exercise, as applicable; or (ii) the combined voting power of our securities beneficially owned by such holder (together with its affiliates) to exceed 4.99% or 9.99% of the combined voting power of all of our securities outstanding immediately after giving effect to the exercise, as applicable, as such percentage ownership is determined in accordance with the terms of the pre-funded warrants. However, any holder of a pre-funded warrant may increase or decrease such percentage to any other percentage not in excess of 19.99% upon at least 61 days' prior notice for the holder to us. As of December 31, 2024, no shares underlying the pre-funded warrants had been exercised.