Net Loss per Common Share

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Net Loss per Common Share

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 months ended March 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 March 31, 2019 and 2018, as they would be anti-dilutive:

	Three Months Ended March 31,
	2019		2018
Warrants to purchase common stock		3,552,672		28,532
Options to purchase common stock and other stock-based    awards		1,545,719		1,668,219
Total		5,098,391		1,696,751