Loss Per Common Share

12 Months Ended

Dec. 31, 2020

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,
	2020		2019		2018
Numerator
Net loss	$	(156,220)	$	(235,329)	$	(90,733)

Denominator
Basic and diluted weighted average common shares (1)	226,042		225,159		223,999

Loss per common share:
Basic and diluted	$	(0.69)	$	(1.05)	$	(0.41)


(1)			Approximate number of shares 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 the results from operations are at a net loss position.						1,048						737						922