Net Loss per Common Share

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Earnings Per Share [Text Block]

3. Net Loss per Common Share

Basic net loss per common share is computed by dividing net loss by the weighted-average number of common shares outstanding during the period. Potential common stock equivalents are determined using the treasury stock method. For diluted net loss per share purposes, stock options and other stock-based awards are excluded, including shares issued as a result of option exercises but which are subject to repurchase by the Company, whose effect would be anti-dilutive from the calculation. For diluted net loss per share purposes, warrants conferring the right to purchase common shares and because CDIs and common shares are interchangeable at the election of the stockholder, warrants conferring the right to purchase CDIs are excluded from diluted net loss per share calculations as inclusion would have an anti-dilutive effect. During each of the years ended December 31, 2019 and 2018, common stock equivalents were excluded from the calculation of diluted net loss per common share, as their effect was anti-dilutive due to the net loss incurred. Therefore, basic and diluted net loss per share was the same in all periods presented.

The following potentially dilutive securities have been excluded from the computation of diluted weighted- average shares outstanding as of December 31, 2019 and 2018, as they would be anti-dilutive:

	Years Ended December 31,
	2019		2018
Warrants to purchase common stock		28,532		1,972,976
Options to purchase common stock and other stock-based awards		3,331,154		1,545,719
Total		3,359,686		3,518,695