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Net Loss Per Share (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
 
2018
 
2017
Numerator:
 
 
 
Net loss used for calculation of basic and diluted EPS
$
(49,536
)
 
$
(37,655
)
 
 
 
 
Denominator:
 
 
 
Weighted average shares outstanding, basic
36,936,560

 
34,958,228

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

 
—

Weighted average shares outstanding, diluted
36,936,560

 
34,958,228

 
 
 
 
Net loss per share, basic and diluted
$
(1.34
)
 
$
(1.08
)