The accompanying unaudited condensed consolidated financial statements have been prepared on a going concern basis, which contemplates the realization of assets and satisfaction of liabilities in the normal course of business. Since inception, the Company has incurred, and continues to incur, significant losses from operations. The Company has funded its operations primarily through external investor financing arrangements and significant actions taken by the Company, including the following:

On October 18, 2021, the Company closed a registered direct offering (the “October 2021 Offering”) with a single healthcare-focused institutional investor of 150,000 shares of convertible preferred stock and warrants to purchase up to an aggregate of 7,500,000 shares of common stock. The shares of preferred stock have a stated value of $100 per share and are convertible into an aggregate of 7,500,000 shares of common stock at a conversion price of $2.00 per share at any time after the Company has received stockholder approval to increase the number of authorized shares of common stock of the Company. The warrants have an exercise price of $2.05 per share, will become exercisable on the later of the date of such stockholder approval and six months following the date of issuance, and will expire five years following the initial exercise date. The October 2021 Offering raised aggregate net proceeds of $13.9 million, and gross proceeds of $15.0 million.

Going Concern and Management's Plans	9 Months Ended
Sep. 30, 2021
Liquidation Basis Of Accounting Abstract [Abstract]
Going Concern and Management's Plans	Note 2 – Going Concern and Management’s Plans The accompanying unaudited condensed consolidated financial statements have been prepared on a going concern basis, which contemplates the realization of assets and satisfaction of liabilities in the normal course of business. Since inception, the Company has incurred, and continues to incur, significant losses from operations. The Company has funded its operations primarily through external investor financing arrangements and significant actions taken by the Company, including the following: • On October 18, 2021, the Company closed a registered direct offering (the “October 2021 Offering”) with a single healthcare-focused institutional investor of 150,000 shares of convertible preferred stock and warrants to purchase up to an aggregate of 7,500,000 shares of common stock. The shares of preferred stock have a stated value of $100 per share and are convertible into an aggregate of 7,500,000 shares of common stock at a conversion price of $2.00 per share at any time after the Company has received stockholder approval to increase the number of authorized shares of common stock of the Company. The warrants have an exercise price of $2.05 per share, will become exercisable on the later of the date of such stockholder approval and six months following the date of issuance, and will expire five years following the initial exercise date. The October 2021 Offering raised aggregate net proceeds of $13.9 million, and gross proceeds of $15.0 million. 9 • On March 9, 2021, the Company entered into a Warrant Exercise Agreement (the “Exercise Agreement”) with the institutional investor (the “Holder”) from our 2020 PIPE financing (see discussion below for a description of the 2020 PIPE). Pursuant to the Exercise Agreement, in order to induce the Holder to exercise all of the remaining 4,842,615 outstanding warrants acquired in the 2020 PIPE (the “Existing Warrants”) for cash, pursuant to the terms of and subject to beneficial ownership limitations contained in the Existing Warrants, the Company agreed to issue to the Holder new warrants (the “New Warrants”) to purchase 0.65 shares of common stock for each share of common stock issued upon such exercise of the Existing Warrants pursuant to the Exercise Agreement or an aggregate of 3,147,700 New Warrants. The terms of the New Warrants are substantially similar to those of the Existing Warrants, except that the New Warrants have an exercise price of $3.56. The New Warrants are immediately exercisable and will expire five years from the date of the Exercise Agreement. The Holder paid an aggregate of $255,751 to the Company for the purchase of the New Warrants. The Company received aggregate gross proceeds before expenses of approximately $9.65 million from the exercise of the remaining Existing Warrants held by the Holder and the payment of the purchase price for the New Warrants (together, the “2021 Warrant Exercise”). As additional compensation, A.G.P./Alliance Global Partners, the Company’s placement agent for such warrant exchange, will receive a cash fee equal to $200,000 upon the cash exercise in full of the New Warrants. • On February 11, 2021, the Company closed a registered direct offering (the "February 2021 Offering”) with a single U.S.-based, healthcare-focused institutional investor for the purchase of (i) 2,784,184 shares of common stock and (ii) 5,549,149 pre-funded warrants, with each pre-funded warrant exercisable for one share of common stock. The Company also issued to the investor, in a concurrent private placement, unregistered common share purchase warrants to purchase 4,166,666 shares of the Company’s common stock. Each share of common stock and accompanying common warrant were sold together at a combined offering price of $3.00, and each pre-funded warrant and accompanying common warrant were sold together at a combined offering price of $2.99. The pre-funded warrants were immediately exercisable, at an exercise price of $0.01, and could be exercised at any time until all of the pre-funded warrants are exercised in full. The common warrants have an exercise price of $3.55 per share, are exercisable commencing on the six-month anniversary of the date of issuance, and will expire five and one-half (5.5) years from the date of issuance. The February 2021 Offering raised aggregate net proceeds of $23.5 million, and gross proceeds of $25.0 million. As of September 30, 2021, all 5,549,149 pre-funded warrants issued in the February 2021 Offering have been exercised. • On November 25, 2020, the Company closed a private placement (the “2020 PIPE”) with one healthcare-focused U.S. institutional investor for the purchase of (i) 2,245,400 shares of common stock, (ii) 4,842,615 warrants to purchase shares of common stock and (iii) 2,597,215 pre-funded warrants, with each pre-funded warrant exercisable for one share of common stock. Each share of common stock and accompanying common warrant were sold together at a combined offering price of $2.065, and each pre-funded warrant and accompanying common warrant were sold together at a combined offering price of $2.055. The common warrants have an exercise price of $1.94 per share, and are exercisable commencing on the six-month anniversary of the date of issuance, and will expire five and one-half (5.5) years from the date of issuance. The 2020 PIPE raised aggregate net proceeds of $9.3 million, and gross proceeds of $10.0 million. As of December 31, 2020, all 2,597,215 pre-funded warrants issued in the 2020 PIPE have been exercised. • On February 11, 2020, the Company entered into an At the Market Common Offering (the “ATM Agreement”) with H.C. Wainwright & Co., LLC (“Wainwright”), which was amended and restated on November 13, 2020 to add BTIG, LLC (“BTIG”), pursuant to which the Company may offer and sell from time to time in an “at the market offering”, at its option, up to an aggregate of $22.1 million of shares of the Company's common stock through the sales agents (the “2020 ATM Offering”). During the year ended December 31, 2020, the Company sold 7,521,610 shares of its common stock under the 2020 ATM Offering resulting in aggregate net proceeds to the Company of approximately $15.8 million, and gross proceeds of $16.7 million. Since January 1, 2021, the Company sold 680,000 shares of its common stock under the 2020 ATM Offering, all of which were sold subsequent to September 30, 2021, resulting in aggregate net proceeds to the Company of approximately $1,500,000, and gross proceeds of approximately $1,548,000. To meet its capital needs, the Company is considering multiple alternatives, including, but not limited to, strategic financings or other transactions, additional equity financings, debt financings and other funding transactions, licensing and/or partnering arrangements. There can be no assurance that the Company will be able to complete any such transaction on acceptable terms or otherwise. The Company believes that current cash, including the October 2021 Offering, will be sufficient to repay or refinance the current portion of the Company’s debt and fund operations into the fourth quarter of 2022. This has led management to conclude that there is substantial doubt about the Company’s ability to continue as a going concern. In the event the Company is unable to successfully raise additional capital during or before the end of the fourth quarter of 2022, the Company will not have sufficient cash flows and liquidity to finance its business operations as currently contemplated. Accordingly, in such circumstances, the Company would be compelled to immediately reduce general and administrative expenses and delay research and development projects, pause or abort clinical trials including the purchase of scientific equipment and supplies, until it is able to obtain sufficient financing. If such sufficient financing is not received on a timely basis, the Company would then need to pursue a plan to license or sell its assets, seek to be acquired by another entity, cease operations and/or seek bankruptcy protection.

•

On March 9, 2021, the Company entered into a Warrant Exercise Agreement (the “Exercise Agreement”) with the institutional investor (the “Holder”) from our 2020 PIPE financing (see discussion below for a description of the 2020 PIPE). Pursuant to the Exercise Agreement, in order to induce the Holder to exercise all of the remaining 4,842,615 outstanding warrants acquired in the 2020 PIPE (the “Existing Warrants”) for cash, pursuant to the terms of and subject to beneficial ownership limitations contained in the Existing Warrants, the Company agreed to issue to the Holder new warrants (the “New Warrants”) to purchase 0.65 shares of common stock for each share of common stock issued upon such exercise of the Existing Warrants pursuant to the Exercise Agreement or an aggregate of 3,147,700 New Warrants. The terms of the New Warrants are substantially similar to those of the Existing Warrants, except that the New Warrants have an exercise price of $3.56. The New Warrants are immediately exercisable and will expire five years from the date of the Exercise Agreement. The Holder paid an aggregate of $255,751 to the Company for the purchase of the New Warrants. The Company received aggregate gross proceeds before expenses of approximately $9.65 million from the exercise of the remaining Existing Warrants held by the Holder and the payment of the purchase price for the New Warrants (together, the “2021 Warrant Exercise”). As additional compensation, A.G.P./Alliance Global Partners, the Company’s placement agent for such warrant exchange, will receive a cash fee equal to $200,000 upon the cash exercise in full of the New Warrants.

•

On February 11, 2021, the Company closed a registered direct offering (the "February 2021 Offering”) with a single U.S.-based, healthcare-focused institutional investor for the purchase of (i) 2,784,184 shares of common stock and (ii) 5,549,149 pre-funded warrants, with each pre-funded warrant exercisable for one share of common stock. The Company also issued to the investor, in a concurrent private placement, unregistered common share purchase warrants to purchase 4,166,666 shares of the Company’s common stock. Each share of common stock and accompanying common warrant were sold together at a combined offering price of $3.00, and each pre-funded warrant and accompanying common warrant were sold together at a combined offering price of $2.99. The pre-funded warrants were immediately exercisable, at an exercise price of $0.01, and could be exercised at any time until all of the pre-funded warrants are exercised in full. The common warrants have an exercise price of $3.55 per share, are exercisable commencing on the six-month anniversary of the date of issuance, and will expire five and one-half (5.5) years from the date of issuance. The February 2021 Offering raised aggregate net proceeds of $23.5 million, and gross proceeds of $25.0 million. As of September 30, 2021, all 5,549,149 pre-funded warrants issued in the February 2021 Offering have been exercised.

•

On November 25, 2020, the Company closed a private placement (the “2020 PIPE”) with one healthcare-focused U.S. institutional investor for the purchase of (i) 2,245,400 shares of common stock, (ii) 4,842,615 warrants to purchase shares of common stock and (iii) 2,597,215 pre-funded warrants, with each pre-funded warrant exercisable for one share of common stock. Each share of common stock and accompanying common warrant were sold together at a combined offering price of $2.065, and each pre-funded warrant and accompanying common warrant were sold together at a combined offering price of $2.055. The common warrants have an exercise price of $1.94 per share, and are exercisable commencing on the six-month anniversary of the date of issuance, and will expire five and one-half (5.5) years from the date of issuance. The 2020 PIPE raised aggregate net proceeds of $9.3 million, and gross proceeds of $10.0 million. As of December 31, 2020, all 2,597,215 pre-funded warrants issued in the 2020 PIPE have been exercised.

•

On February 11, 2020, the Company entered into an At the Market Common Offering (the “ATM Agreement”) with H.C. Wainwright & Co., LLC (“Wainwright”), which was amended and restated on November 13, 2020 to add BTIG, LLC (“BTIG”), pursuant to which the Company may offer and sell from time to time in an “at the market offering”, at its option, up to an aggregate of $22.1 million of shares of the Company's common stock through the sales agents (the “2020 ATM Offering”). During the year ended December 31, 2020, the Company sold 7,521,610 shares of its common stock under the 2020 ATM Offering resulting in aggregate net proceeds to the Company of approximately $15.8 million, and gross proceeds of $16.7 million. Since January 1, 2021, the Company sold 680,000 shares of its common stock under the 2020 ATM Offering, all of which were sold subsequent to September 30, 2021, resulting in aggregate net proceeds to the Company of approximately $1,500,000, and gross proceeds of approximately $1,548,000.

To meet its capital needs, the Company is considering multiple alternatives, including, but not limited to, strategic financings or other transactions, additional equity financings, debt financings and other funding transactions, licensing and/or partnering arrangements. There can be no assurance that the Company will be able to complete any such transaction on acceptable terms or otherwise. The Company believes that current cash, including the October 2021 Offering, will be sufficient to repay or refinance the current portion of the Company’s debt and fund operations into the fourth quarter of 2022. This has led management to conclude that there is substantial doubt about the Company’s ability to continue as a going concern. In the event the Company is unable to successfully raise additional capital during or before the end of the fourth quarter of 2022, the Company will not have sufficient cash flows and liquidity to finance its business operations as currently contemplated. Accordingly, in such circumstances, the Company would be compelled to immediately reduce general and administrative expenses and delay research and development projects, pause or abort clinical trials including the purchase of scientific equipment and supplies, until it is able to obtain sufficient financing. If such sufficient financing is not received on a timely basis, the Company would then need to pursue a plan to license or sell its assets, seek to be acquired by another entity, cease operations and/or seek bankruptcy protection.