Net Loss Per Share

9 Months Ended

Sep. 30, 2021

3.	Net Loss Per Share

Basic net loss per share is calculated by dividing net loss by the weighted-average number of common stock outstanding during the period without consideration for common stock equivalents. Diluted net loss per share is computed by dividing net loss by the weighted-average number of common stock equivalents outstanding for the period determined using the treasury-stock method. For purposes of this calculation, stock options and warrants for common stock are considered to be common stock equivalents and are only included in the calculation of diluted net loss per share when their effect is dilutive.

The following shares of common stock equivalents were excluded from the calculation of diluted net loss per share for the periods presented because including them would have been antidilutive:

	September 30, 2021		September 30, 2020
Series A warrants for common stock		7,790,879		7,802,241
Series B warrants for common stock		2,524,732		2,574,727
Options to purchase common stock		4,880,267		4,246,167
Warrants for common stock		727,122		727,122
Total potential dilutive shares		15,923,000		15,350,257

Also excluded from the calculation of diluted net loss per share are 570,629 shares of common stock issued by the Company subsequent to September 30, 2021 under its At-The Market (ATM) program (see Note 8).