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Equity Financing
 12 Months Ended
Dec. 31, 2022
Equity [Abstract]  
Equity Financing Equity Financing
Public Offering of Common Stock
On December 3, 2019, we entered into an underwriting agreement with Piper Jaffray & Co., as representatives of several underwriters (the "December 2019 Underwriters"), in connection with the issuance and sale of 47,782,500 shares of our common stock, which included the full exercise of the underwriters' option to purchase additional shares, at a public offering price of $3.13 per share. We completed the offering on December 6, 2019 and received aggregate net proceeds of approximately $138.4 million, after deducting the underwriting discounts and commissions and offering expenses payable by us.
On January 4, 2021, the Company entered into an underwriting agreement with Piper Sandler & Co., as representative of the several underwriters named therein (the “January 2021 Underwriters”), with respect to the issuance and sale of 11,856,500 shares of our common stock, which included the full exercise of the January 2021 Underwriters’ option to purchase additional shares, at a price to the public of $4.85 per share. The Company completed the offering on January 7, 2021 and received net proceeds of approximately $53.5 million, after deducting the underwriting discounts and commissions and estimated offering expenses payable by the Company.
On November 16, 2021, the Company entered into an underwriting agreement with Piper Sandler & Co. and Stifel, Nicolaus & Company, Incorporated, as representatives of the several underwriters named therein (the “November 2021 Underwriters”), with respect to the issuance and sale by the Company of 14,375,000 shares of our common stock, which included the full exercise of the November 2021 Underwriters' option to purchase additional shares, at a price to the public of $5.60 per share. The Company completed the offering on November 18, 2021, and received net proceeds of approximately $75.1 million, after deducting the underwriting discounts and commissions and estimated offering expenses payable by the Company.