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Common Stock and Warrants
 3 Months Ended
Mar. 31, 2023
Preferred Stock Common Stock And Warrants [Abstract]  
Common Stock, Preferred Stock and Warrants

10. Common Stock and Warrants

Common Stock

As of March 31, 2023, there were 128,471,773 shares of our common stock outstanding.

On August 6, 2020, we entered into an at-the-market Sales Agreement (the “2020 ATM Agreement”) with Cowen and Company, LLC (“Cowen”), under which 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 $150 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 March 31, 2023, we had $120.5 million remaining under the 2020 ATM Agreement.

Warrants

During the three months ended March 31, 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. For the three months ended March 31, 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.