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Net Income (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Numerators and Denominators of Basic and Diluted Net Income (Loss) Per Share Computations
The following table presents the calculation of basic and diluted net loss per share (in thousands, except per share amounts):
 
December 31,
 
2016
 
2015
 
2014
Numerator:
 
 
 
 
 
  Net loss
$
(72,314
)
 
$
(15,661
)
 
$
(46,248
)
Denominator:
 
 
 
 
 
Weighted average number of shares outstanding:
 
 
 
 
 
  Basic and diluted
77,705

 
87,514

 
92,508

Net loss per share:
 
 
 
 
 
  Basic and diluted
$
(0.93
)
 
$
(0.18
)
 
$
(0.50
)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
The following table presents the potential weighted common shares outstanding that were excluded from the computation of basic and diluted net loss per share calculations (in thousands):
 
December 31,
 
2016
 
2015
 
2014
Stock options
5,295

 
6,460

 
7,115

Restricted stock units
2,536

 
2,178

 
2,066

Stock purchase rights under the ESPP
659

 
518

 
346

Warrants (1)
206

 
—

 
—

  Total
8,696

 
9,156

 
9,527