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Net Income (Loss) Per Share
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Net Income (Loss) Per Share
NET INCOME (LOSS) PER SHARE
Basic net income (loss) per share is computed by dividing the net income (loss) attributable to common stockholders for the applicable period by the weighted average number of common shares outstanding during the period. Potentially dilutive shares, consisting of outstanding stock options, restricted stock units, ESPP plan awards as well as the Notes, are excluded from the net income (loss) per share computations when their effect is anti-dilutive.
The following table presents the calculation of basic and diluted net income (loss) per share (in thousands, except per share amounts):
 
December 31,
 
2015
 
2014
 
2013
Numerator:
 
 
 
 
 
  Income (loss) from continuing operations
$
(15,661
)
 
$
(46,248
)
 
$
21,589

  Income from discontinued operations
—

 
—

 
15,438

  Net income (loss)
$
(15,661
)
 
$
(46,248
)
 
$
37,027

Denominator:
 
 
 
 
 
Weighted average shares outstanding:
 
 
 
 
 
  Basic
87,514

 
92,508

 
106,529

  Effect of dilutive securities from stock options, restricted stock units and ESPP
—

 
—

 
1,279

  Diluted
87,514

 
92,508

 
107,808

Basic net income (loss) per share from:
 
 
 
 
 
  Continuing operations
$
(0.18
)
 
$
(0.50
)
 
$
0.20

  Discontinued operations
$
—

 
$
—

 
$
0.14

  Net income (loss)
$
(0.18
)
 
$
(0.50
)
 
$
0.35

Diluted net income (loss) per share from:
 
 
 
 
 
  Continuing operations
$
(0.18
)
 
$
(0.50
)
 
$
0.20

  Discontinued operations
$
—

 
$
—

 
$
0.14

  Net income (loss)
$
(0.18
)
 
$
(0.50
)
 
$
0.34


The diluted net loss per share is the same as basic net loss per share for the years ended December 31, 2015 and 2014 because potential common shares are only considered when their effect would be dilutive. 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,
 
2015
 
2014
 
2013
Stock options
6,460

 
7,115

 
6,454

Restricted stock units
2,178

 
2,066

 
437

Employee stock purchase plan
518

 
346

 
175

  Total
9,156

 
9,527

 
7,066



Also excluded from the table above are the Notes, which are convertible under certain conditions (see Note 12, Convertible Notes and Credit Facilities for additional information on the Notes) into an aggregate of 22,304,348 shares of common stock. Since the Company’s intent is to settle the principal amount of the Notes in cash, the treasury stock method is being used to calculate any potential dilutive effect of the conversion spread on diluted net income per share, if applicable. The conversion spread will have a dilutive impact on diluted net income per share when the Company’s average market price of its common stock for a given period exceeds the conversion price of $5.75 per share.