Net Loss Per Share

12 Months Ended

Dec. 31, 2020

13.	Net Loss Per Share

Basic net loss per share is calculated by dividing the net loss by the weighted-average number of common shares outstanding during the period. Diluted net loss per share is computed by dividing the net loss by the weighted-average number of common shares outstanding during the period and giving effect to all potentially dilutive common shares using the treasury-stock method. For purposes of this calculation, outstanding stock options, stock awards, warrants and Series B Convertible Preferred Stock are considered to be potentially dilutive common shares and are only included in the calculation of diluted net loss per share when their effect is dilutive.

	Year Ended
	December 31,
	2020			2019			2018
Numerator
Net loss	$	(75,240	)	$	(152,600	)	$	(158,899	)
Preferred stock deemed dividend		-			(3,267	)		-
Net loss allocable to common stockholders, basic		(75,240	)		(155,867	)		(158,899	)
Removal of change in fair value of warrant liability		(4,124	)		-			-
Net loss allocable to common stockholders, diluted	$	(79,364	)	$	(155,867	)	$	(158,899	)
Denominator
Weighted average shares used to compute net loss allocable to common stockholders per share, basic		100,753			72,024			62,362
Effect of dilutive warrants		751			-			-
Weighted average shares used to compute net loss allocable to common stockholders per share, diluted		101,504			72,024			62,362

The following were excluded from the calculation of diluted net loss per share as the effect of their inclusion would have been anti-dilutive:

	December 31,
	2020		2019		2018
Outstanding securities not included in diluted net loss per share calculation (in thousands):
Stock options and stock awards		10,299		9,789		7,344
Series B Convertible Preferred Stock (as converted to common stock)		4,140		4,840		-
Warrants (as exercisable into common stock)		-		5,841		-