Note 2 - Net Loss Per Common Share

9 Months Ended

Sep. 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 September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Shares of common stock subject to outstanding options		4,492,414		5,299,296		4,691,424		5,562,611
Employee stock purchase plan		15,673		51,253		20,151		32,272
Restricted stock units		891,087		780,914		929,968		691,647
Total common stock equivalents		5,399,174		6,131,463		5,641,543		6,286,530