Net Loss Per Share (Tables)

9 Months Ended

Sep. 30, 2020

Earnings Per Share [Abstract]

Schedule of Anti-dilutive Common Stock Equivalents Excluded from the Calculation of Diluted 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 September 30,		Nine Months Ended September 30,
	2020	2019	2020	2019
Outstanding stock options	3,546	3,920	3,546	3,920
Common stock warrants	—	39	—	39
Shares issuable under employee stock purchase plan	19	23	19	23
Outstanding restricted stock units (1)	572	366	572	366
	4,137	4,348	4,137	4,348

(1)This balance is comprised of both the restricted stock units and performance-based restricted stock units described in Note 16.