Net Loss Per Share

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Net Loss Per Share

3.    Net Loss Per Share

Basic net loss per share is calculated by dividing net loss by the weighted-average number of common shares outstanding during the period without consideration for common stock equivalents. Diluted net loss per share is computed by dividing net loss by the weighted-average number of common share equivalents outstanding for the period determined using the treasury-stock method. For purposes of this calculation, stock options are considered to be common stock equivalents and are only included in the calculation of diluted net loss per share when their effect is dilutive. As of June 30, 2017 and June 30, 2016, 7,716,043 and 4,409,724 outstanding options to purchase common stock, respectively, were excluded from the calculation of diluted net loss per share for the periods presented because including them would have been antidilutive.