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, the Company excludes stock options and other stock-based awards, 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. During the three and nine months ended September 30, 2018 and 2017, 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 September 30, 2018 and 2017, as they would be anti-dilutive:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Warrants to purchase common stock		1,972,976		28,532		1,972,976		28,532
Options to purchase common stock and other stock-based awards		1,545,719		1,504,938		1,545,719		1,504,938
Total		3,518,695		1,533,470		3,518,695		1,533,470