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Net loss per share
6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Net loss per share

10. 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):

 

 

Three and six months ended June 30,

 

 

 

2015

 

 

 

2014

 

 

Warrants

 

177

 

 

 

338

 

 

Outstanding stock options

 

3,853

 

 

 

4,112

 

 

Unvested restricted stock

 

 

 

 

27

 

 

Restricted stock units

 

203

 

 

 

 

 

ESPP shares

 

4

 

 

 

 

 

Acquisition holdback

 

94

 

 

 

94

 

 

 

 

4,331

 

 

 

4,571