Net Loss per Share (Tables)

6 Months Ended

Jun. 30, 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 June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Series A convertible preferred stock (if converted)		—		593,522		—		746,001
Options to purchase common stock		10,277,120		9,714,129		10,899,546		9,157,418
Common stock warrants		4,336,072		4,811,629		4,370,302		4,315,410
Restricted stock units		575,129		134,587		1,070,969		135,878
Total		15,188,321		15,253,867		16,340,817		14,354,707