Net Loss Per Share (Tables)

3 Months Ended

Mar. 31, 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   March 31,
	2020	2019
Outstanding stock options	4,232	4,115
Common stock warrants	39	39
Shares issuable under employee stock purchase plan	13	13
Outstanding restricted stock units (1)	557	630
	4,841	4,797

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