Net Loss per Share (Tables)

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Anti-Dilutive Securities Excluded from Calculation of Diluted Net Loss Per Share

Since the Company was in a loss position for all periods presented, diluted net loss per common share is the same as basic net loss per common share for all periods presented, because the inclusion of all potential common shares outstanding would have an anti-dilutive effect. The following weighted-average common stock equivalents were excluded from the calculation of diluted net loss per share for the periods presented, because including them would have an anti-dilutive effect:

	Three Months Ended March 31,
	2019		2018
Series A convertible preferred stock (if converted)		—		900,174
Options to purchase common stock		8,399,374		8,600,707
Common stock warrants		4,404,673		3,819,190
Restricted stock units		511,329		137,168
Total		13,315,376		13,457,239