Stockholders' Equity

3 Months Ended

Mar. 31, 2022

Equity [Abstract]

Stockholders' Equity

Stockholders’ Equity

Sale of Common Stock Under ATM Agreement

On April 5, 2019, we entered into a collective at-the-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.

During January 2022, the Company entered into a Securities Purchase Agreement with Hanmi, pursuant to which Hanmi purchased 12,500,000 shares of our common shares at a purchase price of $1.60 per share, for an aggregate purchase price equal to $20 million.

We sold and issued common shares under the April 2019 ATM Agreement as follows:

Period in Which Issued	No. of Common Shares Issued	Proceeds Received (Net of Broker Commissions and Fees )
Year ended December 31, 2021	15,851,391	$	52,621