Net Loss per Share (Tables)

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

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

	Years Ended December 31,
	2016	2015	2014
Shares issuable under Equity Incentive Plan	5,567	5,932	6,193
Shares issuable upon the conversion of warrants	73	75	75
Total anti-dilutive securities	5,640	6,007	6,268