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Common Stock and Warrants
 6 Months Ended
Jun. 30, 2023
Preferred Stock Common Stock And Warrants [Abstract]  
Common Stock and Warrants

10. Common Stock and Warrants

Common Stock

As of June 30, 2023, there were 128,779,031 shares of our common stock outstanding.

We entered into an at-the-market Sales Agreement with Cowen and Company, LLC (“Cowen”) on August 6, 2020 and an amendment to such agreement on August 3, 2023 (the sales agreement as amended, the “2020 ATM Agreement”). Under the 2020 ATM Agreement, we may offer and sell from time to time, at our sole discretion, shares of our common stock having an aggregate offering price of up to $120.0 million through Cowen as our sales agent. We agreed to pay Cowen a commission of up to 3% of the gross sales proceeds of any common stock sold through Cowen under the 2020 ATM Agreement. As of June 30, 2023, we had approximately $120.0 million remaining under the 2020 ATM Agreement.

Warrants

During the six months ended June 30, 2022, all of the 1,882,600 outstanding warrants as of December 31, 2021 were exercised or expired, resulting in cash proceeds totaling $8.5 million. During the six months ended June 30, 2022, we recognized the decrease in the estimated fair value of warrant liability of $1.8 million as income in other income (expense) in our condensed consolidated statements of operations.