Net Loss per Share (Tables)

6 Months Ended

Jun. 30, 2020

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,
	2020		2019		2020		2019
Options to purchase common stock		9,423,891		10,277,120		10,245,135		10,899,546
Common stock warrants		3,614,019		4,336,072		3,614,019		4,370,302
Restricted stock units		1,995,840		575,129		3,379,806		1,070,969
Total		15,033,749		15,188,321		17,238,960		16,340,817