Net Loss Per Common Share

9 Months Ended

Sep. 30, 2018

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,
	2018	2017	2018	2017
Shares of common stock subject to outstanding options	5,995,401	6,322,215	6,065,250	6,134,966
Employee stock purchase plan	27,117	25,481	32,513	31,944
Restricted stock units	445,598	70,000	363,896	59,945
Total common stock equivalents	6,468,116	6,417,696	6,461,659	6,226,855