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Stockholders' Equity | 6 Months Ended
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Jun. 30, 2022
Stockholders' Equity Attributable to Parent [Abstract] |
Stockholders' Equity | Stockholders’ Equity Common Stock Total common stock authorized to be issued as of June 30, 2022 was 1,000,000,000 shares, with a par value of $0.0001 per share. At June 30, 2022 and December 31, 2021, there were 98,137,070 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. As of June 30, 2022, 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. On April 7, 2021, we entered into an At Market Issuance Sales Agreement with B. Riley Securities, Inc. ("B. Riley"), pursuant to which we may offer and sell, from time to time, shares of our common stock through or to B. Riley, for an aggregate offering price of up to $25,000. We paid B. Riley a commission of 3% of the gross proceeds of the sales price per share for sales of our common stock sold through or to B. Riley. As of June 30, 2021, 691,584 shares of our common stock has been sold and we have received aggregate net cash proceeds of $979, of which $112 had been received by us in cash as of June 30, 2021. We received the balance subsequent to the end of the quarter, and accordingly, we recorded $867 in prepaid expenses and other current assets as of June 30, 2021. Transaction costs were $30. We also incurred additional transaction costs paid outside of closing of $147. We terminated the sales agreement with B. Riley on February 4, 2022, with an effective date of February 9, 2022. Warrants We have various warrants outstanding. A summary of our outstanding warrants is set forth below:
|  | June 30, 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.

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