Net loss per share

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Net loss per share

11. 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 including them would have had an anti-dilutive effect (in thousands):

	March 31,
		2016	2015
Warrants		—	177
Outstanding stock options		4,104	4,074
Restricted stock units		320	179
ESPP shares		10	1
Acquisition holdback		—	94
		4,434	4,525