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Net Loss Per Common Share
6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Net Loss Per Common Share
Net Loss Per Common Share
Basic net loss per share attributable to common stockholders is calculated by dividing the net loss attributable to common stockholders by the weighted-average number of common shares outstanding for the period, without consideration for common stock equivalents. Diluted net loss per share attributable to common stockholders is computed by dividing the net loss attributable to common stockholders by the weighted-average number of common share equivalents outstanding for the period determined using the treasury-stock method. For purposes of this calculation, outstanding options and unvested RSUs settleable in shares of common stock are considered to be common stock equivalents and are only included in the calculation of diluted net loss per share when their effect is dilutive.

The following table sets forth the computation of basic and diluted net loss per share (in millions, except per share data):

 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2015
 
2014
 
2015
 
2014
Numerator for basic and diluted net loss per share:
 
 
 
 
 
 
 
Net loss for basic
$
(3.7
)
 
$
(6.0
)
 
$
(16.6
)
 
$
(18.5
)
Impact of income related to mark-to-market on contingent consideration obligation settleable in shares

 
(1.0
)
 

 

Net loss for diluted
$
(3.7
)
 
$
(7.0
)
 
$
(16.6
)
 
$
(18.5
)
 
 
 
 
 
 
 
 
Denominator for basic and diluted net loss per share:
 
 
 
 
 
 
 
Weighted average common shares outstanding for basic
79.6

 
75.0

 
78.7

 
74.2

Dilutive potential common stock outstanding:
 
 
 
 
 
 
 
Contingently issuable shares related to contingent consideration obligation settleable in shares

 
0.3

 

 

Weighted average common shares outstanding for diluted
79.6

 
75.3

 
78.7

 
74.2

Basic net loss per share
$
(0.05
)
 
$
(0.08
)
 
$
(0.21
)
 
$
(0.25
)
Diluted net loss per share
$
(0.05
)
 
$
(0.09
)
 
$
(0.21
)
 
$
(0.25
)


Historical outstanding anti-dilutive securities not included in diluted net loss per share attributable to common stockholders calculation (in millions): 

 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2015
 
2014
 
2015
 
2014
Options outstanding to purchase common stock
2.1

 
4.5

 
2.1

 
4.5

Unvested restricted stock units
4.4

 
4.6

 
4.4

 
4.6

Total
6.5

 
9.1

 
6.5

 
9.1