Loss Per Share

The following table is a reconciliation of the weighted average shares used in the computation of loss per share for the periods presented (in thousands, except per share data):



	Three Months Ended June 30,
	2019							2018
	Loss			Weighted Average Shares	Per- Share			Loss			Weighted Average Shares	Per- Share
Loss per share - basic and diluted
Net loss available to common stockholders	$	(22,542	)	23,600	$	(0.96	)	$	(18,559	)	23,106	$	(0.80	)



	Six Months Ended June 30,
	2019							2018
	Loss			Weighted Average Shares	Per- Share			Loss			Weighted Average Shares	Per- Share
Loss per share - basic and diluted
Net loss available to common stockholders	$	(51,700	)	23,578	$	(2.19	)	$	(54,803	)	23,103	$	(2.37	)

Basic loss per share is calculated using the weighted average number of common shares outstanding during the period. Diluted earnings per share is calculated using the weighted average number of common shares and common share equivalents outstanding during the period (which consist of warrants, options, restricted stock awards, restricted stock units and convertible debt to the extent they are dilutive). The weighted average number of common shares outstanding excludes 3,112,840 shares repurchased pursuant to a prepaid forward share repurchase agreement associated with the issuance of the convertible senior notes due 2020. Common share equivalents that could potentially dilute basic earnings per share in the future, which were excluded from the computation of diluted earnings per share due to being anti-dilutive, totaled 27,675,542 for the three and six months ended June 30, 2019. Common share equivalents that could potentially dilute basic earnings per share in the future, which were excluded from the computation of diluted earnings per share due to being anti-dilutive, totaled 25,268,205 for the three and six months ended June 30, 2018.