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Loss Per Common Share
 6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Loss Per Common Share
Loss Per Common Share

Basic loss per common share is determined by dividing net loss by the weighted average number of common shares outstanding during the period. Diluted loss per share is determined by dividing net loss by the weighted average number of common shares outstanding, assuming all potentially dilutive shares were issued. We apply the treasury stock method to determine the dilutive weighted average common shares represented by the unvested restricted stock units and ESPP shares.

The following table summarizes the basic and diluted loss per share calculations (in thousands, except per share amounts):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2018
 
2017
 
2018
 
2017
Numerator
 
 
 
 
 
 
 
Net loss
$
(25,763
)
 
$
(25,950
)
 
$
(67,836
)
 
$
(52,613
)
Denominator
 
 
 
 
 
 
 
Basic and diluted weighted average common shares (1)
223,981

 
222,914

 
223,775

 
222,740

Loss per common share:
 
 
 
 
 
 
 
Basic and diluted
$
(0.12
)
 
$
(0.12
)
 
$
(0.30
)
 
$
(0.24
)
 
 
 
 
 
 
 
 
 
(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 loss per share as the effect would be anti-dilutive when results from operations are at a net loss position.
678

 
425

 
639

 
616