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Stockholders' Equity
 12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Stockholders' Equity STOCKHOLDERS’ EQUITY
Authorized Stock
In June 2018, our stockholders approved an amendment and restatement of our Certificate of Incorporation to reflect an increase in the number of authorized shares of our common stock from 175 million shares to 300 million shares. In addition to the increase in the authorized number of shares of common stock, the amendment eliminates designated series of preferred stock that are obsolete and are no longer outstanding or issuable, including Series B Junior Participating Preferred Stock and Series E Convertible Voting Preferred Stock. As of December 31, 2021, we had five million shares of preferred stock authorized and no shares of preferred stock outstanding.
Stockholder Rights Agreement
On November 29, 2010, our Board of Directors approved a stockholder rights agreement (the “Stockholder Rights Agreement”), effective December 13, 2010. A stockholder rights agreement is designed to deter coercive, unfair, or inadequate takeovers and other abusive tactics that might be used in an attempt to gain control of our company. A stockholder rights agreement will not prevent takeovers at a full and fair price, but rather is designed to deter coercive takeover tactics and to encourage anyone attempting to acquire our company to first negotiate with our Board of Directors.
On March 27, 2018, we entered into a Second Amendment to Rights Agreement which had the effect of suspending the Stockholders Rights Agreement as of March 30, 2018. On December 13, 2020, the Stockholder Rights Agreement expired under its terms.
Share Grants Subject to Shareholder Approval

In December 2021, we announced that Tom Riga would be our next President and Chief Executive Officer effective December 31, 2021 and join the Company’s Board of Directors upon assuming his new role. Prior to this appointment, he served as our Chief Commercial Officer and Chief Operating Officer. As a result of this announcement in January 2022, Mr. Riga was granted 1,078,500 stock options and 239,500 restricted stock units vesting one third on each of January 14, 2023, 2024, and 2025. These share grants are contingent upon shareholder approval during the next Annual Shareholder’s Meeting.
Common Stock Issuable Upon Exercise of Stock Options and Vesting of Restricted Stock Units
As of December 31, 2021, (i) 6.4 million shares of our common stock are issuable upon the exercise of outstanding stock options (regardless of whether in or out-of-the-money) and (ii) 0.4 million shares of our common stock are issuable if the maximum market conditions of our outstanding restricted stock unit agreements are met.
Public Offering of Common Stock
On July 30, 2020, we announced the pricing of an underwritten public offering of 21,666,667 shares of our common stock at a public offering price of $3.00 per share. The net proceeds from the offering were approximately $61.1 million, after deducting underwriting discounts and commissions. In addition, we granted the underwriters a 30-day option to purchase up to an additional 3,250,000 shares of common stock.
On August 3, 2020, the underwriters fully exercised their option to purchase an additional 3,250,000 shares of our common stock at the public offering price of $3.00 per share, less underwriting discounts and commissions, for additional net proceeds of approximately $9.2 million. After giving effect to the exercise in full of the underwriters’ option, the total number of shares sold in the public offering was 24,916,667 shares and net proceeds were approximately $69.7 million, net of underwriting discounts and offering expenses of $5.0 million.
Sale of Common Stock Under ATM Agreements

On April 5, 2019, we entered into a new collective at-market-issuance (“ATM”) sales agreement with Cantor Fitzgerald & Co., H.C. Wainwright & Co., LLC and B. Riley FBR, Inc. (the “April 2019 ATM Agreement”), pursuant to which we may offer and sell shares of our common stock by any method deemed to be an “at the market” offering (the “ATM Offering”). From April 5, 2019 to March 2, 2020, the ATM Offering was conducted pursuant to a sales agreement prospectus filed with our automatic shelf registration statement on Form S-3ASR, filed with the SEC on April 5, 2019, which registered an aggregate offering price of $150 million under the April 2019 ATM Agreement. From May 8, 2020 to June 30, 2020, the ATM Offering was conducted pursuant to a sales agreement prospectus (the “Initial Sales Agreement Prospectus”) filed with our shelf registration statement on Form S-3, filed with the SEC on March 20, 2020, as amended by Pre-Effective Amendment No. 1 thereto, and declared effective by the SEC on May 8, 2020 (the “Registration Statement”), which registered an aggregate offering price of up to $75 million under the April 2019 ATM Agreement. On July 29, 2020, we terminated the Initial Sales Agreement Prospectus, but left the April 2019 ATM Agreement in full force and effect. On November 6, 2020, we filed a new sales agreement prospectus to the Registration Statement, which registered an aggregate offering price of up to $60 million under the April 2019 ATM Agreement.
On July 13, 2021, we filed a shelf registration statement with the SEC on Form S-3, which was declared effective by the SEC on July 21, 2021 (the “Registration Statement”). The Registration Statement registered an aggregate offering price of up to $300 million of securities that may be issued and sold by us from time to time, including up to an aggregate offering price of $150 million of common stock (which amount is included in the $300 million aggregate offering price set forth in the base prospectus) that may be issued and sold pursuant to the April 2019 ATM Agreement.

We sold and issued common shares under the April 2019 ATM Agreement as follows:
Description of Financing TransactionNo. of Common Shares Issued Proceeds Received (Net of Broker Commissions and Fees )
Common shares issued pursuant to the April 2019 ATM Agreement during the year ended December 31, 20203,950,398 $14,902 
Common shares issued pursuant to the April 2019 ATM Agreement during the year ended December 31, 202115,851,391 $52,621 
These proceeds and any future proceeds raised will support the advancement of our in-development drug candidates, activities in connection with the launch of these drugs (including the hiring of personnel, building inventory supply and equipment purchases), completing acquisitions of assets, businesses, or securities, and for all other working capital purposes.