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Net Loss Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Basic and Diluted Loss Per Common Share Computation
Basic and diluted loss per common share is computed as follows (in thousands except share and per share data):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
Net loss used for calculation of basic and diluted EPS
$
(43,244
)
 
$
(40,654
)
 
$
(92,780
)
 
$
(78,310
)
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted average shares outstanding, basic
42,153,813

 
35,784,804

 
39,559,599

 
35,373,799

Effect of dilutive securities:
 
 
 
 
 
 
 
Stock options and restricted stock units
—

 
—

 
—

 
—

Weighted average shares outstanding, diluted
42,153,813

 
35,784,804

 
39,559,599

 
35,373,799

 
 
 
 
 
 
 
 
Net loss per share, basic and diluted
$
(1.03
)
 
$
(1.14
)
 
$
(2.35
)
 
$
(2.21
)