Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity

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Stockholders' Equity
 3 Months Ended
Mar. 31, 2022
Stockholders' Equity Attributable to Parent [Abstract]  
Stockholders' Equity Stockholders’ Equity
Common Stock
Total common stock authorized to be issued as of March 31, 2022 was 1,000,000,000 shares, with a par value of $0.0001 per share. At March 31, 2022 and December 31, 2021, there were 97,250,520 and 96,751,610 shares of our common stock outstanding.
On January 31, 2022, we entered into an At Market Issuance Sales Agreement with H.C. Wainwright & Co., LLC (“Wainwright”), pursuant to which we may offer and sell, from time to time, shares of our common stock, par value $0.0001 per share, for aggregate gross proceeds of up to $100,000, through or to Wainwright, as agent or principal. We are not obligated to sell shares of our common stock under the sales agreement with Wainwright. We have not sold any shares of common stock pursuant to the sales agreement with Wainwright. Sales of shares of our common stock sold under the sales agreement will be made pursuant to an effective shelf registration statement on Form S-3 in the amount of $200,000 filed with the SEC on February 1, 2022.
In January 2021, 2,670,121 shares of our common stock were sold in an at-the-market offering with Ascendiant Capital Markets, LLC ("Ascendiant") for aggregate net cash proceeds of $5,058. Transaction costs were $156. We terminated the Sales Agreement with Ascendiant effective as of March 28, 2021.
In February 2021, we entered into an underwriting agreement with Northland Securities, Inc. and Roth Capital Partners, LLC, relating to an underwritten public offering to which we issued 11,761,111 shares of our common stock at an offering price of $2.25 per share. Aggregate cash proceeds at closing, net of transaction costs of $1,740, totaled $24,722. We incurred additional transaction costs paid outside of closing of $75.
Warrants
We have various warrants outstanding. A summary of our outstanding warrants is set forth below:

March 31, 2022
December 31, 2021
Warrant Type Cash Exercise
Price per
share		 Number of warrants Cash Exercise
Price per
share		 Number of warrants
2020 Convertible Note warrant $ 2.25  1,780,000  $ 2.25  1,780,000 
Common stock warrant (Series D-1) $ 2.25  35,555  $ 2.25  35,555 
Common stock warrants (Series F) $ 9.22  377,402  $ 9.22  377,402 
Public warrants (PHUNW) $ 11.50  1,761,291  $ 11.50  1,761,291 
Private placement warrants $ 11.50  1,658,381  $ 11.50  1,658,381 
Unit purchase option warrants $ 11.50  24,172  $ 11.50  24,172 
Total 5,636,801  5,636,801 
Except as set forth below, there have been no material changes to the terms of our outstanding warrants. Additional information about our various warrants outstanding is in included under the subheading, "Warrants", in Note 13, Stockholders' Equity, in our Annual Report on Form 10-K filed with the SEC on April 7, 2022.
2020 Convertible Note Warrant
In connection with the issuance of the 2020 Convertible Notes, in 2020, we issued a warrant exercisable for three (3) years for the purchase, initially, of up to an aggregate of 2,160,000 shares of the Company's common stock at an initial exercise price of $4.00 per share. The number of shares and exercise price are each subject to adjustment provided under the warrant. As a result of our underwritten public offering in February 2021, the exercise price of each share decreased to $2.25 per share, and the number of shares for which the warrant is exercisable increased to 3,840,000 shares. If, at the time of exercise of the warrant, there is no effective registration statement registering, or no current prospectus available for, the issuance of the shares, then the warrant may also be exercised, in whole or in part, by means of a “cashless exercise.” The registration statement registering 2,160,000 shares of our common stock issuable pursuant to the terms of the warrant was declared effective by the SEC on October 27, 2020. In April 2022, we filed a registration statement, as amended, registering 250% of the additional warrant shares as result of the adjustment noted above. The registration statement was declared effective by the SEC on May 2, 2022. The warrant may not be exercised if, after giving effect to the exercise, the investor would beneficially own amounts in excess of those permissible under the terms of the warrant.