Net Loss per Share (Tables)

9 Months Ended

Sep. 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 September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Series A convertible preferred stock (if converted)		—		—		—		494,601
Options to purchase common stock		11,350,034		11,769,686		10,613,157		10,028,174
Common stock warrants		3,866,555		4,694,837		4,200,541		4,441,885
Restricted stock units		437,933		1,457,638		1,206,267		576,464
Total		15,654,522		17,922,161		16,019,965		15,541,124