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Common and Preferred Stock
 3 Months Ended
Mar. 31, 2024
Equity [Abstract]  
Common and Preferred Stock

11. Common and Preferred Stock

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 March 31, 2024 and December 31, 2023, 270,801,781 and 270,034,495 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. There were no sales under the CF Sales Agreement for the three months ended March 31, 2024. During the three months ended March 31, 2023, the Company sold 269,383 shares of common stock at a weighted average purchase price of $4.45 per share for gross proceeds of approximately $1.2 million pursuant to the CF Sales Agreement.

During the three months ended March 31, 2024, the Company received $1.4 million from the market price stock purchase plan ("MPSPP") for 416,099 shares of common stock. There were no MPSPP transactions during the three months ended March 31, 2023.

For shares of common stock issued pursuant to the Company's 2004 employee stock purchase plan ("ESPP"), see Note 13 – Stock-Based Compensation Expense.