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Net Loss Per Share (Tables)
 3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share Reconciliation
A reconciliation of basic and diluted net loss per share, together with the related shares outstanding in thousands is as follows: 
 
 
Three Months Ended March 31,
Net Loss Per Share:
 
2019
 
2018
 
 
 
 
 
Net loss
 
$
(13,018
)
 
$
(12,236
)
 
 
 
 
 
Weighted average shares:
 
 

 
 

Basic shares
 
37,354

 
38,559

Effect of dilutive securities—employee and director equity awards outstanding and 2023 Notes
 
—

 
—

Diluted shares
 
37,354

 
38,559

 
 
 
 
 
Net loss per share - basic
 
$
(0.35
)

$
(0.32
)
Net loss per share - diluted  
 
$
(0.35
)

$
(0.32
)