Potentially Dilutive Securities (Tables)

6 Months Ended

Jun. 30, 2019

Potentially Dilutive Securities Tables

Potentially Dilutive Securities Excluded From Computation of Diluted Net Loss Per Common Share

The following outstanding potentially dilutive securities have been excluded from the computations of diluted net loss per common share:

	As of June 30,
	2019		2018
Options to purchase common stock		15,139,374		15,651,023
Warrants to purchase common stock		331,193		331,193
		15,470,567		15,982,216