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Income (Loss) Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Income (Loss) Per Share, Basic and Diluted
The following table summarizes the basic and diluted income (loss) per share calculations (in thousands, except per share amounts):
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2018
 
2017
 
2018
 
2017
Numerator
 
 
 
 
 
 
 
Net income (loss)
$
(6,999
)
 
$
2,296

 
$
(74,835
)
 
$
(50,317
)
Denominator
 
 
 
 
 
 
 
Basic weighted average common shares
224,182

 
223,056

 
223,912

 
222,847

Restricted stock units (1)
—

 
525

 
—

 
—

Diluted weighted average common shares (1)
224,182

 
223,581

 
223,912

 
222,847

Income (loss) per common share:
 
 
 
 
 
 
 
Basic
$
(0.03
)
 
$
0.01

 
$
(0.33
)
 
$
(0.23
)
Diluted
$
(0.03
)
 
$
0.01

 
$
(0.33
)
 
$
(0.23
)
 
 
 
 
 
 
 
 
 
(1) 
Approximate number of unvested restricted stock units and stock to be issued pursuant to the ESPP that have been excluded from the computation of diluted income (loss) per share as the effect would be anti-dilutive when results from operations are at a net loss position.
1,075

 
—

 
779

 
624