Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY AND LOSS PER SHARE

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STOCKHOLDERS' EQUITY AND LOSS PER SHARE
9 Months Ended
Sep. 30, 2020
Equity [Abstract]  
STOCKHOLDERS' EQUITY AND LOSS PER SHARE STOCKHOLDERS’ EQUITY AND LOSS PER SHARE
Common Stock
     Pursuant to our amended and restated certificate of incorporation, we are authorized to issue 100,000,000 shares of common stock. Holders of our common stock are entitled to dividends as and when declared by the Board of Directors, subject to rights and holders of all classes of stock outstanding having priority rights to dividends. There have been no dividends declared to date. Each share of common stock is entitled to one vote.
    On July 31, 2019, we entered into a securities purchase agreement for the sale of an aggregate of 3,960,560 shares of common stock at a price of $2.53 per share. Gross proceeds were approximately $10.0 million with net proceeds of $9.9 million after deducting fees and operating expenses. The initial closing, for 1,193,762 shares, took place on August 9, 2019 and gross proceeds were approximately $3.0 million. The second closing with a single investor, which was subject to additional conditions, including the execution of a definitive multi-year commercial agreement with an affiliate of the investor, for 2,766,798 shares and gross proceeds of $7.0 million took place on September 30, 2019.
    On February 6, 2020, we entered into an underwriting agreement relating to an underwritten public offering of 16,666,667 shares of the Company’s common stock, $0.001 par value, at an offering price to the public of $1.50 per share. Pursuant to the underwriting agreement, the Company granted the underwriters a 30-day option to purchase up to an additional 2,500,000 shares of common stock on the same terms and conditions. The underwriters exercised their option with respect to all 2,500,000 additional shares on February 10, 2020. We consummated the sale of an aggregate of 19,166,667 shares of our common stock, including the 2,500,000 shares subject to the underwriters’ over-allotment option, on February 11, 2020, and received gross proceeds of approximately $28.8 million, or net proceeds of approximately $26.4 million after deducting the underwriting discount and expenses paid by us.
On August 14, 2020, we entered into an At-The-Market Equity Offering Sales Agreement whereby we may offer and sell from time to time, shares of our common stock, par value $0.001 per share, up to an aggregate offering price of $25.0 million (the "ATM equity program"). No common stock has been issued under the ATM equity program as of September 30, 2020.
Preferred Stock
Pursuant to our amended and restated certificate of incorporation, we are authorized to issue 3,000,000 shares of preferred stock. The Board of Directors has the authority, without action by our stockholders, to designate and issue shares of preferred stock in one or more series and to fix the rights, preferences, privileges and restrictions thereof. To-date, no preferred shares have been issued.
Loss Per Share
The following table presents the number of shares excluded from the calculation of diluted net loss per share attributable to common stockholders for the periods below:
Nine Months Ended September 30,
  2020 2019
Common stock warrants —  2,134,362 
Common stock options 1,152,552  1,338,603 
Non-vested restricted stock unit awards 3,552,143  2,672,087 
Total shares excluded from net loss per share attributable to common stockholders 4,704,695  6,145,052