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Basic and Diluted Net Income (Loss) Per Share
 3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block]
Basic and Diluted Net Loss per Share

A reconciliation of the numerator and the denominator used to calculate basic and diluted net loss per share is as follows (in thousands, except per share amounts):
 
Three Months Ended
 
March 31,
 
2015
 
2014
Numerator — Basic
 
 
 
Net loss
$
(7,053
)
 
$
(10,434
)
Numerator — Diluted
 
 
 
Net loss
$
(7,053
)
 
$
(10,434
)
Interest on convertible notes, net of tax benefit (B)
—

 
—

Net loss, diluted
$
(7,053
)
 
$
(10,434
)
Denominator — Basic
 
 
 
Weighted average shares used to calculate net loss per share, basic
36,649

 
29,864

Denominator — Diluted
 
 
 
Weighted average shares used to calculate net loss per share, basic
36,649

 
29,864

Effect of convertible notes (A)
—

 
—

Effect of dilutive restricted stock units (B)
—

 
—

Effect of dilutive stock options (B)
—

 
—

Weighted average shares used to calculate net loss per share, diluted
36,649

 
29,864

Net loss per share
 
 
 
Basic
$
(0.19
)
 
$
(0.35
)
Diluted
$
(0.19
)
 
$
(0.35
)


(A)
For the three months ended March 31, 2014, $2.1 million as-if converted shares associated with the Company's convertible senior notes were excluded from the calculation as their effect would have been anti-dilutive.

(B)
For the three months ended March 31, 2015 and 2014, the following equity awards, by type, were excluded from the calculation, as their effect would have been anti-dilutive (in thousands):
 
Three Months Ended
 
March 31,
 
2015
 
2014
Stock options
2,721

 
3,188

Restricted stock units
105

 
282

Performance based restricted stock units (C)
1,450

 
674

Total equity award shares excluded
4,276

 
4,144



(C)
2014 performance based restricted stock units are presented based on attainment of 100% of the performance goals being met. The maximum multiplier for a given semi-annual performance period was 2.75x the original grant and overall achievement was limited to a maximum of 2.5x of the target award over the entire performance period (Note 11 —Stock-based Compensation). Based on this formula, the maximum number of shares that could have been earned was 1.8 million for the three months ended March 31, 2014.