Basic net income per share is calculated by dividing the net income attributable to common stockholders by the weighted average number of shares of common stock outstanding during the period. Diluted net income per share also includes the weighted average number of outstanding warrants and options in the denominator. In the event of a loss, the diluted loss per share is the same as basic loss per share. Because of the net loss, the weighted average number of diluted shares of common stock outstanding for the three and six months ended June 30, 2017 did not include 60,620 shares of common stock issuable upon the exercise of outstanding common stock purchase warrants, and 899,375 shares of common stock issuable upon the exercise of outstanding options to purchase common stock due to its anti-dilutive effect. The following table represents the computation of basic and diluted income and (losses) per share for the three months and six ended June 30, 2017 and 2016.