Net Loss per Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Securities not included in the net loss per common share calculations

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

	Three months ended June 30,		Six months ended June 30,
	2018	2017	2018	2017
Shares of common stock issuable pursuant to equity awards outstanding under the Equity Incentive Plan	7,462	7,621	7,462	7,621
Shares of common stock issuable upon exercise of outstanding warrants	—	73	—	73
Total shares excluded as anti-dilutive	7,462	7,694	7,462	7,694