Note 10.  Stockholders’ equity:

Preferred Stock:

During the nine months ended September 30, 2019, 8,801 shares of the Company’s Series B preferred stock were converted into 8,801 shares of the Company’s common stock. During the nine months ended September 30, 2018, 1,353,505 shares of the Company’s Series B preferred stock were converted into 1,353,505 shares of the Company’s common stock.

At-the-Market Equity Offering:

The Company entered into a Sales Agreement with H.C. Wainwright dated May 24, 2019, pursuant to which the Company may, from time to time, sell up to $100 million in shares of the Company’s common stock through H. C. Wainwright, as the Company’s sales agent and/or principal, in the ATM Offering. All sales of the shares have been made pursuant to an effective shelf registration statement on Form S-3 filed with the SEC. The Company pays H.C. Wainwright a commission of approximately 3.0% of the aggregate gross proceeds the Company received from all sales of the Company's common stock under the Sales Agreement. The Company received net proceeds on sales of 7,608,785 shares of common stock under the Sales Agreement of approximately $22.7 million at a weighted average price of $3.10 (excluding commissions) during the nine months ended September 30, 2019.

Restricted Stock:

During the nine months ended September 30, 2019, 106,251 shares of common stock were issued, related to fully vested restricted stock rights previously granted under the Company’s 2017 Equity Incentive Plan. Additionally, a total of 48,500 restricted stock rights were awarded to a consultant and advisory board members. The shares vest monthly over one to two year periods.