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Loss Per Common Share
 12 Months Ended
Dec. 31, 2019
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 loss attributable to common stockholders 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):
 
Year Ended December 31,
 
2019
 
2018
 
2017
Numerator
 
 
 
 
 
Net loss
$
(235,329
)
 
$
(90,733
)
 
$
(159,457
)
 
 
 
 
 
 
Denominator
 
 
 
 
 
Basic and diluted weighted average common shares (1)
225,159

 
223,999

 
222,940

 
 
 
 
 
 
Loss per common share:
 
 
 
 
 
Basic and diluted
$
(1.05
)
 
$
(0.41
)
 
$
(0.72
)
 
 
(1)
Approximate number of shares of unvested restricted stock units and stock to be issued pursuant to the ESPP have been excluded from the computation of diluted loss per share as the effect would be anti-dilutive when the results from operations are at a net loss position.
737

 
922

 
648