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Net loss per share (Tables)
 12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Common Stock Equivalents Excluded from Calculation of Diluted 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,

 

 

 

2016

 

 

 

2015

 

 

 

2014

 

Warrants

 

—

 

 

 

—

 

 

 

177

 

Outstanding stock options

 

3,735

 

 

 

3,532

 

 

 

3,652

 

Restricted stock units

 

263

 

 

 

148

 

 

 

179

 

ESPP shares

 

11

 

 

 

3

 

 

 

6

 

Acquisition holdback

 

—

 

 

 

—

 

 

 

94

 

 

 

4,009

 

 

 

3,683

 

 

 

4,108