13.Common Stock

Authorized Shares of Common Stock

On May 18, 2018, we amended our Certificate of Incorporation (the “Charter Amendment”) to increase the number of authorized shares of common stock from 200,000,000 to 400,000,000 shares.  This Charter Amendment was approved by our stockholders at the annual meeting held on May 16, 2018.  The Charter Amendment became effective upon the filing with the Secretary of State of the State of Delaware on May 18, 2018.

Common Stock Public Offering

In the second quarter of 2018, we completed an underwritten public offering in which we sold 18,400,000 shares of our common stock pursuant to an effective registration statement at a price to the public of $3.90 per share. We received net proceeds of approximately $67.2 million after deducting underwriting discounts and commissions and offering expenses.