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.

The following is a reconciliation of the numerator and the denominator used in the calculation of basic and diluted net loss per share (in thousands):

	Three Months Ended
	March 31,
	2020			2019
Numerator
Net loss, basic	$	(12,595	)	$	(39,672	)
Removal of change in fair value of warrant liability		(8,610	)		-
Net loss, diluted	$	(21,205	)	$	(39,672	)
Denominator
Weighted average shares used to compute basic net loss per share		85,477			63,778
Effect of dilutive warrants		171			-
Weighted average shares used to compute diluted net loss per share		85,648			63,778

As of March 31, 2020, stock options and stock awards and Series B Convertible Preferred Stock (on an as converted to common stock basis), totaling approximately 11,443,432 and 4,840,000 shares of common stock, respectively were excluded from the calculation of diluted net loss per share for the three months ended March 31, 2020, because the effect of their inclusion would have been anti-dilutive. As of March 31, 2019, stock options and stock awards, totaling approximately 8,946,000 shares of common stock were excluded from the calculation of diluted net loss per share for the three months ended March 31, 2019, because the effect of their inclusion would have been anti-dilutive.