Note 8 - Equity Offerings

3 Months Ended

Mar. 31, 2021

Notes to Financial Statements

Stockholders' Equity Note Disclosure [Text Block]

8. Equity Offerings

On August 12, 2019, the Company entered into a Controlled Equity Offering Sales Agreement (the “2019 Sales Agreement”), with Cantor Fitzgerald & Co., (“Cantor”), and commenced an at-the-market offering (the “2019 ATM Offering”) pursuant to which the Company could sell from time to time, at its option, up to an aggregate of $25.0 million shares of the Company’s common stock, through Cantor, as sales agent. Sales of the common stock under the 2019 ATM Offering were made under the Company’s previously filed and currently effective shelf registration statement on Form S-3. The aggregate compensation payable to Cantor was 3.0% of the aggregate gross proceeds from each sale of the Company’s common stock. Under the 2019 ATM Offering, the Company raised gross proceeds of $7.2 million and net proceeds of $7.0 million during the year ended December 31, 2019, and an additional $11.6 million of gross proceeds and $11.2 million of net proceeds during the year ended December 31, 2020.

On  October 9, 2020, the Company filed a prospectus supplement relating to an at-the-market offering with Cantor pursuant to which the Company  may sell from time to time, at its option, up to an aggregate of $40.0 million of shares of the Company’s common stock, through Cantor as sales agent, pursuant to the 2019 Sales Agreement (the “2020 ATM Offering”). Sales of the common stock were made on the Company’s shelf registration statement on Form S-3, which was declared effective by the SEC on  February 10, 2020. The aggregate compensation payable to Cantor was 3.0% of the aggregate gross proceeds from each sale of the Company’s common stock.

The following table summarizes the total sales under the 2019 ATM Offering and 2020 ATM Offering for the three months ended March 31,2021 (in thousands except for share and per share amounts):

	For the three Months Ended March 31, 2021
Total shares of common stock sold		19,120,037
Average price per share	$	1.47
Gross proceeds	$	28,100
Commissions earned by Cantor		843
Net proceeds	$	27,257

On March 10, 2020, the Company closed the March 2020 Public Offering and sold an aggregate of 14,121,766 Class A Units at a public offering price of $0.68 per Class A Unit and 7,937,057 Class B Units at a public offering price of $0.68 per Class B Unit. Each Class A Unit consists of one share of the Company’s common stock, one warrant to purchase one share of common stock that expires on the first anniversary of the date of issuance (collectively, the “Series C Warrants”), and one warrant to purchase one share of common stock that expires on the fifth anniversary of the date of issuance (collectively, the “Series D Warrants”). Each Class B Unit consists of one share of Series A Convertible Preferred Stock, par value $0.01 per share (the “Series A Preferred Stock”), convertible into one share of common stock, a Series C Warrant to purchase one share of common stock and a Series D Warrant to purchase one share of common stock. The Class A Units and Class B Units have no stand-alone rights and were not certificated or issued as stand-alone securities. The shares of common stock, Series A Preferred Stock, Series C Warrants and Series D Warrants are immediately separable. In addition, the underwriter for the public offering exercised an overallotment option and purchased 3,308,823 Series C Warrants and 3,308,823 Series D Warrants.

The shares of Series A Preferred Stock rank on par with the shares of the common stock, in each case, as to dividend rights and distributions of assets upon liquidation, dissolution or winding up of the Company. With certain statutory exceptions, as described in the Series A Preferred Stock Certificate of Designation, the shares of Series A Preferred Stock have no voting rights. Each share of Series A Preferred Stock was convertible at any time at the holder’s option into one share of common stock, which conversion ratio was subject to adjustment for stock splits, stock dividends, distributions, subdivisions and combinations and other similar transactions as specified in the Series A Preferred Stock Certificate of Designation. All of the shares of Series A Preferred Stock were converted to common stock by the holders by June 30, 2020. Upon conversion, the Company recorded $0.3 million as a deemed dividend as an immediate charge to earnings available to common stockholders for the year ended December 31, 2020. In accordance with the Series A Preferred Stock Certificate of Designation, the shares of Series A Preferred Stock regained the status of authorized and unissued shares of preferred stock.

The net proceeds to the Company from the March 2020 Public Offering were approximately $13.5 million, after deducting underwriting discounts and commissions and estimated offering expenses payable by the Company. All shares of Series A Preferred Stock were converted into 7.9 million shares of common stock prior to June 30, 2020. Approximately 4.9 million Series C Warrants were exercised during the year ended December 31, 2020, generating net proceeds of $3.3 million. The Class A Units, the Class B Units, the Series A Preferred Stock, the Series C Warrants and the Series D Warrants (together with the shares of common stock underlying the shares of Series A Preferred Stock and such warrants) were offered under the Company’s previously filed Registration Statement on Form S-3, which registration statement expired in May 2020. The Company filed a new registration statement on Form S-1 covering the exercise of the outstanding Series C Warrants and Series D Warrants, which was declared effective by the SEC on May 27, 2020.

On July 6, 2020, the Company completed an underwritten public offering of 42,857,142 shares of its common stock, including the underwriter’s full exercise of an over-allotment option, at the public offering price per share of $0.35 per share, generating net proceeds of approximately $13.6 million. Following the offering, the exercise price of the outstanding Series B Warrants was adjusted to $0.35 per share and the number of shares of common stock underlying such warrants increased to 567,660 shares.

On January 12, 2021, the Company sold in a registered direct offering, 25,000,000 shares of common stock at a purchase price per share of $1.25 for aggregate gross proceeds of $31.25 million, and net proceeds of $28.6 million.

On January 29, 2021, the Company completed an underwritten public offering of 26,545,832 shares of its common stock, including the underwriter’s full exercise of an over-allotment option on February 1, 2021, at the public offering price of $3.00 per share, for aggregate gross proceeds of $79.6 million and net proceeds of approximately $73.4 million.

During the three months ended March 31, 2021, 45,114,210 shares of common stock were issued upon the exercise of Series B, C, and D warrants for aggregate proceeds of $30.5 million.