Net Loss per Share (Tables)

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

Securities not included in the net loss per common share calculations

The following shares were not considered in the computation of diluted net loss per share because their effect was anti-dilutive (in thousands):

	Three Months Ended March 31,
	2017	2016
Shares of common stock issuable pursuant to equity awards outstanding under the Equity Incentive Plan	7,661	6,577
Shares of common stock issuable upon exercise of outstanding warrants	73	73
Total shares excluded as anti-dilutive	7,734	6,650