Net Loss Per Share

12 Months Ended

Dec. 31, 2017

Basic net loss per share is computed by dividing net loss by the weighted-average number of common shares outstanding during the period. Because of net losses recognized in each period, potential common shares issuable upon the exercise of outstanding stock options and warrants and the conversion of preferred shares in the IPO into common shares have not been reflected in the calculation of diluted net loss per share due to the anti-dilutive effect. Diluted net loss per share, therefore, does not differ from basic net loss per share.

The common stock equivalents issuable upon the conversion or exercise of the following dilutive securities have been excluded from the computation of diluted net loss per share attributable to common stockholders calculation because their effect would have been anti-dilutive for the periods presented:



	DECEMBER 31,
	2017	2016	2015
Outstanding stock option grants	4,094,532	3,590,393	2,832,467
Unvested restricted stock awards	195,172	107,250	—
Total	4,289,704	3,697,643	2,832,467