Equity Offering

9 Months Ended

Sep. 30, 2019

Stockholders Equity Note [Abstract]

Equity Offering

8. Equity Offering

On July 28, 2016, the Company filed a prospectus supplement and associated sales agreement related to an at-the-market (“ATM”) equity offering program pursuant to which the Company may sell, from time to time, common stock with an aggregate offering price of up to $75,000 through Cowen and Company LLC, as sales agent, for general corporate purposes.  The Company’s Form S-3 Registration Statement filed on May 20, 2016 has since expired, and as a result, we cannot sell additional common stock under the ATM program until a new Form S-3 Registration Statement is effective.  During the nine months ended September 30, 2019, the Company sold a total of 1,250,000 shares of its common stock under the ATM program for $4,713, or an average of $3.77 per share, and received proceeds of $4,607, net of commissions of $106.  As of September 30, 2019, the Company had sold a total of 4,955,936 shares of its common stock under the ATM program for $54,240, or an average of $10.94 per share, and received proceeds of $53,019, net of commissions of $1,220.  The most recent sales under the ATM program occurred on April 4, 2019.