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Common and Preferred Stock | 12 Months Ended
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Dec. 31, 2023
Equity [Abstract] |
Common and Preferred Stock | 13. Common and Preferred Stock In May 2023, the Company’s stockholders, upon recommendation of the Company’s board of directors, approved an amendment to our Amended and Restated Certificate of Incorporation to increase the authorized number of shares of common stock from 400,000,000 shares to 800,000,000 shares. The Company is authorized to issue 800,000,000 shares of common stock, par value $0.01 per share, and 10,000,000 shares of undesignated preferred stock, par value $0.01 per share, issuable in one or more series as designated by the Company’s board of directors. No other class of capital stock is authorized. As of December 31, 2023 and 2022, 270,034,495 and 263,793,305 shares of common stock, respectively, were issued and outstanding and no shares of preferred stock were outstanding. In February 2018, the Company entered into a controlled equity offering sales agreement (the “CF Sales Agreement”) with Cantor Fitzgerald & Co. (“Cantor Fitzgerald”), as sales agent, pursuant to which the Company may offer and sell, from time to time, through Cantor Fitzgerald, shares of the Company’s common stock having an aggregate offering price of up to $50.0 million or such other amount as may be permitted by the Sales Agreement. Under the Sales Agreement, Cantor Fitzgerald may sell shares by any method deemed to be an “at-the-market offering” as defined in Rule 415 under the Securities Act of 1933, as amended. During the year ended December 31, 2023, the Company sold 1,478,090 shares of common stock at a weighted average purchase price of $4.66 per share for gross proceeds of approximately $6.9 million pursuant to the CF Sales Agreement. During the year ended December 31, 2022, the Company sold 5,059,856 shares of common stock at a weighted average purchase price of $3.91 per share for gross proceeds of approximately $19.8 million pursuant to the CF Sales Agreement. During the year ended December 31, 2021, the Company sold an aggregate of 578,063 shares of the Company’s common stock at a weighted average purchase price of $3.26 per share for aggregate gross proceeds of approximately $1.9 million pursuant to the Sales Agreement. In February 2021, the Company converted $5.0 million principal amount of 2024 convertible notes into 1,666,667 shares of the Company’s common stock. In October 2021, MidCap exercised 1,171,614 and 111,853 warrants issued in association with Tranches 1 and 2, respectively, under the MidCap credit facility, as amended, to purchase an aggregate of 1,283,467 shares of the Company’s common stock through a cashless exercise that resulted in the net issuance of 964,113 shares. See Note 10 – Borrowings. In December 2021, the Mann Group converted $0.4 million of interest and $9.6 million of principal into 4.0 million shares of common stock. See Note 10 – Borrowings. During the year ended December 31, 2021, the Company received $0.1 million from the market price stock purchase plan (“MPSPP”) for 25,000 shares of common stock. During the year ended December 31, 2022, Mann Group converted $10.0 million of principal and capitalized interest into 4,000,000 shares of common stock. In addition, the Company paid interest by issuing Mann Group 75,487 shares of common stock. During the year ended December 31, 2022, the Company received $0.7 million from the MPSPP for 252,176 shares of common stock. During the year ended December 31, 2023, the Company paid interest on the Mann Group convertible note by issuing 50,844 shares of common stock. During the year ended December 31, 2023, the Company received $0.2 million from the MPSPP for 36,004 shares of common stock. Subsequent to December 31, 2023, the Company received $1.4 million from the MPSPP for 416,099 shares of common stock. For shares of common stock issued pursuant to the Company's 2004 employee stock purchase plan ("ESPP"), see Note 15 – Stock Award Plans.

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