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Net loss per share
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Net loss per share

15. 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):

 

 

Year ended December 31,

 

 

 

2015

 

 

 

2014

 

 

 

2013

 

Warrants

 

—

 

 

 

177

 

 

 

338

 

Outstanding stock options

 

3,532

 

 

 

3,652

 

 

 

3,958

 

Unvested restricted stock

 

—

 

 

 

—

 

 

 

69

 

Restricted stock units

 

148

 

 

 

179

 

 

 

—

 

ESPP shares

 

3

 

 

 

6

 

 

 

—

 

Acquisition holdback (Note 11)

 

—

 

 

 

94

 

 

 

—

 

 

 

3,683

 

 

 

4,108

 

 

 

4,365