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Loss Per Common Share
 9 Months Ended
Sep. 30, 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 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 unvested restricted stock units and employee stock purchase plan (“ESPP”) shares.

The following table summarizes the basic and diluted loss per share calculations (in thousands, except per share amounts):
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2019
 
2018
 
2019
 
2018
Numerator
 
 
 
 
 
 
 
Net loss
$
(23,789
)
 
$
(6,999
)
 
$
(67,236
)
 
$
(74,835
)
Denominator
 
 
 
 
 
 
 
Basic and diluted weighted average common shares (1)
225,415

 
224,182

 
225,043

 
223,912

Loss per common share:
 
 
 
 
 
 
 
Basic and diluted
$
(0.11
)
 
$
(0.03
)
 
$
(0.30
)
 
$
(0.33
)
 
 
 
 
 
 
 
 
 
(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.
587

 
1,075

 
722

 
779