Net Loss Per Common Share

9 Months Ended

Sep. 30, 2017

Basic net loss per common share is calculated by dividing net loss attributable to common stockholders by the weighted-average number of common shares outstanding during the period, without consideration of common stock equivalents. Diluted net loss per common share is computed by dividing net loss attributable to common stockholders by the weighted-average number of common share equivalents outstanding for the period determined using the treasury stock method. The following outstanding common stock equivalents have been excluded from diluted net loss per common share because their inclusion would be anti-dilutive:



	Three Months Ended September 30,		Nine Months Ended September 30,
	2017	2016	2017	2016
Shares of common stock subject to outstanding options	6,322,215	5,312,081	6,134,966	5,031,926
Employee stock purchase plan	25,481	29,435	31,944	34,262
Restricted stock units	70,000	—	59,945	—
Total common stock equivalents	6,417,696	5,341,516	6,226,855	5,066,188