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Stockholders' Equity
 9 Months Ended
Sep. 30, 2022
Stockholders' Equity Note [Abstract]  
Stockholders' Equity STOCKHOLDERS’ EQUITY
At the Market Offerings Agreement
In July 2020, we filed a Form S-3 registration statement, which became effective in August 2020 ("Registration Statement"), containing (i) a base prospectus for the offering, issuance and sale by us of up to a maximum aggregate offering price of $250.0 million of our common stock, preferred stock, debt securities, warrants and/or units, from time to time in one or more offerings; and (ii) a prospectus supplement for the offering, issuance and sale by us of up to a maximum aggregate offering price of $100.0 million of our common stock that may be issued and sold, from time to time, under a sales agreement with Jefferies LLC ("Jefferies"), deemed to be “at the market offerings” (the "2020 Open Market Sales Agreement"). As of December 31, 2021, we had sold 23.3 million shares and received the maximum gross proceeds of $100.0 million pursuant to the 2020 Open Market Sales Agreement.
In August 2021, we filed an additional prospectus supplement under the Registration Statement for the offering, issuance and sale by us of up to a maximum aggregate offering price of $150.0 million of our common stock that may be issued and sold, from time to time, under an additional sales agreement we entered into with Jefferies (the "2021 Open Market Sales Agreement"), pursuant to which we may, from time to time, sell up to $150.0 million in shares of our common stock through Jefferies. We are not required to sell shares under the 2021 Open Market Sales Agreement. Pursuant to the 2021 Open Market Sales Agreement, Jefferies, as our sales agent, receives a commission of up to 3% of the gross sales price for shares of common stock sold under the 2021 Open Market Sales Agreement. During the three months ended September 30, 2022 we sold 32.6 million shares and received gross proceeds of $35.1 million at a weighted average sales price of approximately $1.08 per share under the 2021 Open Market Sales Agreement. During the nine months ended September 30, 2022 we sold 53.1 million shares and received gross proceeds of $54.0 million at a weighted average sales price of approximately $1.02 per share under the 2021 Open Market Sales Agreement. As of September 30, 2022, we have sold a total of 68.8 million shares and received aggregate gross proceeds of $79.0 million under the 2021 Open Market Sales Agreement.