Net Loss Per Share

6 Months Ended

Jun. 30, 2020

Earnings Per Share [Abstract]

Net Loss Per Share

Net Loss Per Share

The following common stock equivalents were excluded from the calculation of diluted net loss per share for the periods indicated because their inclusion would have had an anti-dilutive effect (in thousands):

	Three Months Ended    June 30,		Six Months Ended    June 30,
	2020	2019	2020	2019
Outstanding stock options	3,680	3,995	3,680	3,995
Common stock warrants	39	39	39	39
Shares issuable under employee stock purchase plan	13	13	13	13
Outstanding restricted stock units (1)	532	461	532	461
	4,264	4,508	4,264	4,508

(1)This balance is comprised of both the restricted stock units and performance-based restricted stock units described in Note 15.