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Net Loss per Share (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Schedule of Calculation of Basic and Diluted Net Loss Per Share
The following table presents the calculation of basic and diluted net loss per share (in thousands, except per share data): 
 
 
Three months ended September 30,
 
Nine months ended September 30,
 
 
2017
 
2016
 
2017
 
2016
Net loss
 
$
(76,429
)
 
$
(60,940
)
 
$
(171,843
)
 
$
(150,419
)
Weighted average common shares used for basic and diluted net loss per share computation
 
87,283

 
85,105

 
86,679

 
84,779

Net loss per share:
 
 
 
 
 
 
 
 
Basic and Diluted
 
$
(0.88
)
 
$
(0.72
)
 
$
(1.98
)
 
$
(1.77
)