Basic and Diluted Net Loss per Common Share

12 Months Ended

Dec. 31, 2019

Basic and Diluted Net Loss per Common Share

The following table provides a reconciliation of the numerator and denominator used in computing basic and diluted net loss attributable to common stockholders per common share:



	Years Ended December 31,
(in thousands, except per share amounts)	2019			2018			2017
Numerator:
Net loss attributable to common stockholders	$	(356,388	)	$	(348,995	)	$	(284,002	)
Denominator:
Weighted average common shares outstanding — basic and diluted	240,421,001			185,790,021			153,355,144

Dilutive common stock equivalents would include the dilutive effect of common stock options, convertible debt units, RSUs and warrants for common stock equivalents. Potentially dilutive common stock equivalents were excluded from the diluted earnings per share denominator for all periods because of their anti-dilutive effect. For the year ended December 31, 2019 there were 462 thousand potential common shares outstanding as a result of the Convertible Debt that were excluded from the diluted net loss per share calculation because their effect would have been anti-dilutive.

The table below presents potential shares of common stock that were excluded from the computation as they were anti-dilutive using the treasury stock method:



	Year ended December 31,
(in thousands)	2019	2018	2017
Options to purchase common stock	16,724	15,810	15,181
Convertible debt	462	40,850	40,850
Outstanding warrants, convertible to common stock	2,555	2,657	3,110
Unvested restricted stock units	5,792	3,712	2,575
Vested restricted stock units, unissued	186	91	50
Total number of potentially issuable shares	25,719	63,120	61,766