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Net Loss per Share (Tables)
 12 Months Ended
Dec. 31, 2018
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):
 
 
Year Ended December 31,
 
 
2018
 
2017
 
2016
Net loss
 
$
(504,080
)
 
$
(244,614
)
 
$
(194,375
)
Weighted average common shares used for basic and diluted net loss per share computation
 
89,472

 
86,983

 
84,977

Net loss per common share:
 
 

 
 

 
 

Basic and Diluted
 
$
(5.63
)
 
$
(2.81
)
 
$
(2.29
)