Stockholders' Equity	12 Months Ended
Dec. 31, 2019
Stockholders' Equity
Stockholders' Equity	8.Stockholders’ Equity Issuances of Common Stock –On September 20, 2018, we entered into a securities purchase agreement with certain investors pursuant to which we agreed to sell, in a registered direct offering, an aggregate of 98,454 shares of our common stock and pre-funded warrants to purchase up to 14,624 shares of our common stock for gross proceeds of approximately $1.5 million (the “2018 Registered Direct Offering”). In a concurrent private placement, we also agreed pursuant to the securities purchase agreement to issue to such investors Series A warrants to purchase up to 113,077 shares of our common stock (the “2018 Private Placement”). Additionally, we issued warrants to purchase up to 6,785 shares of our common stock in a private placement to H.C. Wainwright & Co., LLC as compensation for its services as a placement agent in connection with the 2018 Registered Direct Offering and the 2018 Private Placement. The 2018 Registered Direct Offering and the 2018 Private Placement closed on September 25, 2018. The net proceeds to the Company from the offerings, after deducting the placement agent’s fees and expenses, our offering expenses, and excluding the proceeds, if any, from the exercise of the warrants issued in the offerings, were approximately $1.2 million. On January 14, 2019, we entered into an underwriting agreement with H.C. Wainwright & Co., LLC relating to an underwritten public offering of 429,616 shares of our common stock for gross proceeds of approximately $1.1 million (the "2019 Underwritten Offering"). The offering price to the public in the 2019 Underwritten Offering was $2.60 per share, and H.C. Wainwright & Co., LLC agreed to purchase the shares in the 2019 Underwritten Offering from the Company pursuant to the underwriting agreement at a price of $2.418 per share. Additionally, we issued warrants to purchase up to 25,777 shares of our common stock in a private placement to H.C. Wainwright & Co., LLC as compensation for its services as underwriter in connection with the 2019 Underwritten Offering. The 2019 Underwritten Offering closed on January 17, 2019. The net proceeds to the Company from the 2019 Underwritten Offering, after deducting the underwriting discounts and commissions and expenses and the Company's estimated offering expenses, and excluding the proceeds, if any, from the exercise of the underwriter warrants, were approximately $0.9 million. On January 18, 2019, we entered into a securities purchase agreement with certain investors pursuant to which we agreed to sell, in a registered direct offering, an aggregate of 648,233 shares of our common stock for gross proceeds of approximately $1.7 million (the "January 2019 Registered Direct Offering"). In a concurrent private placement, we also agreed pursuant to the securities purchase agreement to issue to such investors Series A warrants to purchase up to 324,117 shares of our common stock (the "January 2019 Private Placement"). Additionally, we issued warrants to purchase up to 38,894 shares of our common stock in a private placement to H.C. Wainwright & Co., LLC as compensation for its services as a placement agent in connection with the 2019 Registered Direct Offering and the 2019 Private Placement. The 2019 Registered Direct Offering and the 2019 Private Placement closed on January 23, 2019. The net proceeds to the Company from the offerings, after deducting the placement agent's fees and expenses, our offering expenses, and excluding the proceeds, if any, from the exercise of the warrants issued in the offerings, were approximately $1.5 million. On March 12, 2019, we entered into a securities purchase agreement with certain investors pursuant to which we agreed to sell, in a registered direct offering, an aggregate of 712,910 shares of our common stock for gross proceeds of approximately $18.5 million (the "March 2019 Registered Direct Offering"). Additionally, we issued warrants to purchase up to 42,775 shares of our common stock in a private placement to H.C. Wainwright & Co., LLC as compensation for its services as a placement agent in connection with the March 2019 Registered Direct Offering. The March 2019 Registered Direct Offering closed on March 14, 2019. The net proceeds to us from the offerings, after deducting the placement agent's fees and expenses, our offering expenses, and excluding the proceeds, if any, from the exercise of the warrants issued in the offerings, were approximately $17.0 million. On November 21, 2019, we entered into a securities purchase agreement with certain investors pursuant to which we agreed to sell, in a registered direct offering, an aggregate of 808,080 shares of our common stock and warrants to purchase up to 606,060 shares of our common stock for gross proceeds of approximately $8.0 million under the 2019 Shelf Registration Statement (the "November 2019 Registered Direct Offering"). Additionally, we issued warrants to purchase up to 48,485 shares of our common stock to H.C. Wainwright & Co., LLC as compensation for its services as a placement agent in connection with the November 2019 Registered Direct Offering, which warrants and the common stock issuable upon exercise of such warrants were registered under the 2019 Shelf Registration Statement. The November 2019 Registered Direct Offering closed on November 25, 2019. The net proceeds to us from the offerings, after deducting the placement agent's fees and expenses, our offering expenses, and excluding the proceeds, if any, from the exercise of the warrants issued in the offerings, were approximately $7.3 million. During the fiscal year ended December 31, 2019, we issued an aggregate of 409,875 shares of our common stock pursuant to the exercise of warrants at a weighted average exercise price of approximately $2.67 per share. The net proceeds to us from the exercise of the warrants were approximately $1.1 million. Stockholders’ Equity totaled $21.1 million as of December 31, 2019 compared to $1.2 million as of December 31, 2018. There were 3,691,857 shares of common stock issued and outstanding as of December 31, 2019. There were no preferred shares outstanding as of December 31, 2019.

8.Stockholders’ Equity

Issuances of Common Stock –On September 20, 2018, we entered into a securities purchase agreement with certain investors pursuant to which we agreed to sell, in a registered direct offering, an aggregate of 98,454 shares of our common stock and pre-funded warrants to purchase up to 14,624 shares of our common stock for gross proceeds of approximately $1.5 million (the “2018 Registered Direct Offering”). In a concurrent private placement, we also agreed pursuant to the securities purchase agreement to issue to such investors Series A warrants to purchase up to 113,077 shares of our common stock (the “2018 Private Placement”). Additionally, we issued warrants to purchase up to 6,785 shares of our common stock in a private placement to H.C. Wainwright & Co., LLC as compensation for its services as a placement agent in connection with the 2018 Registered Direct Offering and the 2018 Private Placement. The 2018 Registered Direct Offering and the 2018 Private Placement closed on September 25, 2018. The net proceeds to the Company from the offerings, after deducting the placement agent’s fees and expenses, our offering expenses, and excluding the proceeds, if any, from the exercise of the warrants issued in the offerings, were approximately $1.2 million.

On January 14, 2019, we entered into an underwriting agreement with H.C. Wainwright & Co., LLC relating to an underwritten public offering of 429,616 shares of our common stock for gross proceeds of approximately $1.1 million (the "2019 Underwritten Offering"). The offering price to the public in the 2019 Underwritten Offering was $2.60 per share, and H.C. Wainwright & Co., LLC agreed to purchase the shares in the 2019 Underwritten Offering from the Company pursuant to the underwriting agreement at a price of $2.418 per share. Additionally, we issued warrants to purchase up to 25,777 shares of our common stock in a private placement to H.C. Wainwright & Co., LLC as compensation for its services as underwriter in connection with the 2019 Underwritten Offering. The 2019 Underwritten Offering closed on January 17, 2019. The net proceeds to the Company from the 2019 Underwritten Offering, after deducting the underwriting discounts and commissions and expenses and the Company's estimated offering expenses, and excluding the proceeds, if any, from the exercise of the underwriter warrants, were approximately $0.9 million.

On January 18, 2019, we entered into a securities purchase agreement with certain investors pursuant to which we agreed to sell, in a registered direct offering, an aggregate of 648,233 shares of our common stock for gross proceeds of approximately $1.7 million (the "January 2019 Registered Direct Offering"). In a concurrent private placement, we also agreed pursuant to the securities purchase agreement to issue to such investors Series A warrants to purchase up to 324,117 shares of our common stock (the "January 2019 Private Placement"). Additionally, we issued warrants to purchase up to 38,894 shares of our common stock in a private placement to H.C. Wainwright & Co., LLC as compensation for its services as a placement agent in connection with the 2019 Registered Direct Offering and the 2019 Private Placement. The 2019 Registered Direct Offering and the 2019 Private Placement closed on January 23, 2019. The net proceeds to the Company from the offerings, after deducting the placement agent's fees and expenses, our offering expenses, and excluding the proceeds, if any, from the exercise of the warrants issued in the offerings, were approximately $1.5 million.

On March 12, 2019, we entered into a securities purchase agreement with certain investors pursuant to which we agreed to sell, in a registered direct offering, an aggregate of 712,910 shares of our common stock for gross proceeds of approximately $18.5 million (the "March 2019 Registered Direct Offering"). Additionally, we issued warrants to purchase up to 42,775 shares of our common stock in a private placement to H.C. Wainwright & Co., LLC as compensation for its services as a placement agent in connection with the March 2019 Registered Direct Offering. The March 2019 Registered Direct Offering closed on March 14, 2019. The net proceeds to us from the offerings, after deducting the placement agent's fees and expenses, our offering expenses, and excluding the proceeds, if any, from the exercise of the warrants issued in the offerings, were approximately $17.0 million.

On November 21, 2019, we entered into a securities purchase agreement with certain investors pursuant to which we agreed to sell, in a registered direct offering, an aggregate of 808,080 shares of our common stock and warrants to purchase up to 606,060 shares of our common stock for gross proceeds of approximately $8.0 million under the 2019 Shelf Registration Statement (the "November 2019 Registered Direct Offering"). Additionally, we issued warrants to purchase up to 48,485 shares of our common stock to H.C. Wainwright & Co., LLC as compensation for its services as a placement agent in connection with the November 2019 Registered Direct Offering, which warrants and the common stock issuable upon exercise of such warrants were registered under the 2019 Shelf Registration Statement. The November 2019 Registered Direct Offering closed on November 25, 2019. The net proceeds to us from the offerings, after deducting the placement agent's fees and expenses, our offering expenses, and excluding the proceeds, if any, from the exercise of the warrants issued in the offerings, were approximately $7.3 million.

During the fiscal year ended December 31, 2019, we issued an aggregate of 409,875 shares of our common stock pursuant to the exercise of warrants at a weighted average exercise price of approximately $2.67 per share. The net proceeds to us from the exercise of the warrants were approximately $1.1 million.

Stockholders’ Equity totaled $21.1 million as of December 31, 2019 compared to $1.2 million as of December 31, 2018. There were 3,691,857 shares of common stock issued and outstanding as of December 31, 2019. There were no preferred shares outstanding as of December 31, 2019.