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Net Loss Per Share (Tables)
 6 Months Ended
Jun. 30, 2015
Net Loss Per Share [Abstract]  
Calculation of net loss per share, basic and diluted
  
Net Loss
 (Numerator)
  
Weighted Average Common Shares
 (Denominator)
(in thousands)
  
Per Share
 Amount
 
Three months ended June 30, 2015
      
Basic and diluted
 
$
(11,697
)
  
69,647
  
$
(0.17
)
Six months ended June 30, 2015
            
Basic and diluted
 
$
(21,951
)
  
69,642
  
$
(0.32
)
Three months ended June 30, 2014
            
Basic and diluted
 
$
(11,073
)
  
69,561
  
$
(0.16
)
Six months ended June 30, 2014
            
Basic and diluted
 
$
(20,386
)
  
66,775
  
$
(0.31
)
Schedule of antidilutive common shares excluded from computation of diluted earnings per share
For these periods, anti-dilutive common shares excluded from diluted per share amounts consist of the following:

  
Three Months Ended June 30,
 
  
2015
  
2014
 
  
Weighted
Average
 Number
(in thousands)
  
Weighted
Average
 Exercise Price
  
Weighted
Average
 Number
(in thousands)
  
Weighted
Average
 Exercise Price
 
Options
  
6,705
  
$
9.80
   
6,261
  
$
10.14
 
Contingent consideration liability
  
3,025
       
4,347
     
Total
  
9,730
       
10,608
     

  
Six Months Ended June 30,
 
  
2015
  
2014
 
  
Weighted
Average
 Number
(in thousands)
  
Weighted
Average
 Exercise Price
  
Weighted
Average
 Number
(in thousands)
  
Weighted
Average
 Exercise Price
 
Options
  
6,483
  
$
9.93
   
6,066
  
$
10.43
 
Contingent consideration liability
  
2,966
       
3,725
     
Total
  
9,449
       
9,791