Note 2 - Net Loss Per Common Share

6 Months Ended

Jun. 30, 2020

Notes to Financial Statements

Earnings Per Share [Text Block]

2. Net Loss Per Common Share

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 June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Shares of common stock subject to outstanding options		4,823,917		5,721,801		4,792,022		5,696,450
Employee stock purchase plan		26,416		29,471		23,007		27,582
Restricted stock units		945,325		752,607		941,776		646,274
Total common stock equivalents		5,795,658		6,503,879		5,756,805		6,370,306