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Stockholders' Equity
 12 Months Ended
Dec. 31, 2021
Stockholders' Equity Note [Abstract]  
Stockholders' Equity STOCKHOLDERS’ EQUITY
In July 2020, we filed a Form S-3 registration statement, which became effective in August 2020, 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 its common stock that may be issued and sold, from time to time, under an Open Market Sales Agreement with Jefferies LLC, as sales agent, deemed to be “at-the-market offerings” (the "2020 Open Market Sales Agreement"). Pursuant to the 2020 Open Market Sales Agreement, Jefferies, as sales agent, received a commission of up to 3.0% of the gross sales price for shares of common stock sold under the 2020 Open Market Sales Agreement. We sold 8.2 million shares of our common stock between the dates of November 13, 2020 through February 19, 2021, 4.0 million shares between the dates of May 11, 2021 through June 18, 2021, 3.3 million shares between the dates of August 24, 2021 through September 10, 2021 and 7.7 million between the dates of October 21, 2021 through December 31, 2021 for a cumulative total of 23.3 million shares and gross proceeds of $100.0 million at a weighted average sales price of approximately $4.30 per share which resulted in full utilization of the $100.0 million authorized amount under 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 3.0% of the gross sales price for shares of common stock sold under the 2021 Open Market Sales Agreement. As of December 31, 2021 we have sold 15.7 million shares and received gross proceeds of $25.0 million at a weighted average sales price of approximately $1.60 per share under the 2021 Open Market Sales Agreement.
On December 9, 2019, we completed an underwritten public offering of 20.0 million shares of common stock at a price of $6.25 per share before underwriting discounts and commissions (the "2019 Offering"). In connection with the 2019 Offering, we entered into an underwriting agreement, or the 2019 Underwriting Agreement, with Citigroup Global Markets Inc., Cowen and Company LLC, SVB Leerink LLC and Piper Jaffray & Co., or collectively the 2019 Underwriters, pursuant to which we granted to the 2019 Underwriters a 30-day option to purchase up to an additional 3.0 million shares of our common stock, or the 2019 Overallotment. We completed the sale of 23.0 million shares, inclusive of the 2019 Overallotment, to the 2019 Underwriters and that sale resulted in the receipt by us of aggregate gross proceeds of approximately $143.8 million, less underwriting discounts, commissions and offering expenses totaling approximately $8.9 million, which resulted in net proceeds of approximately $134.9 million.
On November 22, 2019, we and KKC entered into a stock purchase agreement, pursuant to which we sold an aggregate of approximately 2.9 million shares of its common stock at $6.96 per share for net proceeds of approximately $20.0 million, or the Private Placement. The Private Placement closed on November 25, 2019.