Stockholders’ Equity

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Stockholders' Equity

Stockholders’ Equity

Preferred Stock

As of September 30, 2021 and December 31, 2020, there were 2,000,000 shares of preferred stock, $0.0001 par value per share, authorized and no shares of preferred stock issued or outstanding.

Common Stock

As of September 30, 2021 and December 31, 2020, there were 170,000,000 shares of common stock, $0.0001 par value per share, authorized and 93,966,381 and 93,573,165 shares issued and outstanding, respectively.

Controlled Equity Offering (or "At the Market" Offering)

On March 22, 2019, the Company entered into a sales agreement (the “Sales Agreement”) with Cantor Fitzgerald & Co. (the “Agent”), pursuant to which the Company may offer and sell from time to time shares of the Company’s common stock through the Agent. The offering and sale of up to $40.0 million of the shares has been registered under the Securities Act of 1933, as amended (the "Securities Act"), pursuant to the Company’s registration statement on Form S-3 (File No. 333-227363), which was originally filed with the SEC on September 14, 2018 and declared effective by the SEC on October 1, 2018, the base prospectus contained within the registration statement, and a prospectus supplement that was filed with the SEC on March 22, 2019. The registration statement on Form S-3 expired on October 1, 2021 and no further sales may be made under the Sales Agreement.

During the three and nine months ended September 30, 2021, the Company has not sold shares of its common stock pursuant to the Sales Agreement. Approximately $32.3 million remained available for sale under this facility as of September 30, 2021.