9.Net Income (Loss) per Common Share

Basic income (loss) per common share is computed by dividing net income (loss) by the weighted average number of shares of common stock outstanding for the period.  Diluted income (loss) per common share is computed by dividing net income (loss) by the weighted average number of shares of common stock outstanding, plus the number of common share equivalents that would be dilutive.  As of June 30, 2018 and December 31, 2017, there were stock options, restricted stock units and warrants to acquire, in the aggregate, 9,799,622 and 8,961,140 shares of the Company’s common stock, respectively, that are potentially dilutive. However, with the exception of the three months ended June 30, 2017, diluted loss per share is the same as basic loss per share for all periods presented because the inclusion of common share equivalents would be anti-dilutive.  For the three months ended June 30, 2017, the dilutive effect of stock warrants, stock options, and restricted stock units was 1,177,987,  1,031,356 and 54,300, respectively.