Stockholders' Equity

12 Months Ended

Dec. 31, 2021

Equity [Abstract]

Stockholders' Equity

Stockholders’ Equity

Preferred Stock

As of December 31, 2021 and 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 December 31, 2021 and 2020, there were 170,000,000 shares of common stock, $0.0001 par value per share, authorized and 93,986,470 and 93,573,165 shares issued and outstanding, respectively.

During the years ended December 31, 2021 and 2020, no vested employee stock options were exercised.

Controlled Equity 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, 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 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 year ended December 31, 2021, the Company did not sell any shares of its common stock pursuant to the Sales Agreement.