Net Loss per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Shares not included in computation of diluted net loss per share

The following shares were not included in the computation of diluted net loss per share (in thousands):

	Years Ended December 31,
	2017	2016	2015
Shares issuable under Equity Incentive Plan	6,882	5,567	5,932
Shares issuable upon the conversion of warrants	—	73	75
Total anti-dilutive securities	6,882	5,640	6,007