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Common and Preferred Stock | 6 Months Ended
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Jun. 30, 2023
Equity [Abstract] |
Common and Preferred Stock | 12. 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 June 30, 2023 and December 31, 2022, 268,235,145 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. For the six months ended June 30, 2023, the Company sold 631,383 shares of common stock at a weighted average purchase price of $4.40 per share for gross proceeds of approximately $2.8 million pursuant to the CF Sales Agreement. There were no sales under the CF Sales Agreement for the six months ended June 30, 2022. During the six months ended June 30, 2023, the Company paid interest on the Mann Group convertible note by issuing 23,683 shares of common stock. During the six months ended June 30, 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 quarterly interest by issuing the Mann Group 31,541 shares of common stock. For the six months ended June 30, 2023, the Company received $0.2 million from the market price stock purchase plan (“MPSPP”) for 36,004 shares. For the six months ended June 30, 2022, the Company received $0.7 million from the MPSPP for 252,176 shares. For shares of common stock issued pursuant to the Company's 2004 employee stock purchase plan ("ESPP"), see Note 14 – Stock-Based Compensation Expense.

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