INCOME (LOSS) PER SHARE

12 Months Ended

Dec. 31, 2019

Basic net income (loss) per share is computed using the weighted-average number of common shares outstanding during the period. Diluted net income (loss) per share is computed using the weighted-average number of common shares and the effect of potentially dilutive securities outstanding during the period. Potentially dilutive securities include stock options, restricted stock units, performance share units, performance bonus awards, ESPP shares, warrants and convertible senior notes. If dilutive, those potentially dilutive securities are reflected in diluted net income (loss) per share using the treasury stock method, except for the convertible senior notes, which are subject to the if-converted method.

The following table sets forth the computation of basic and diluted net income (loss) per share of common stock for the years ended December 31, 2019, 2018 and 2017 (in thousands, except share amounts and per share amounts):



	Year Ended December 31,
	2019			2018			2017
Basic and diluted net income (loss) per share:
Numerator
Net income (loss) - continuing operations	$	(14,292	)	$	1,988		$	28,601
Less: Net income (loss) attributable to noncontrolling interests	10,682			13,067			12,587
Net income (loss) attributable to common stockholders - continuing operations	$	(24,974	)	$	(11,079	)	$	16,014
Net income (loss) attributable to common stockholders - discontinued operations	2,597			—			(1,974		)
Net income (loss) attributable to common stockholders	$	(22,377	)	$	(11,079	)	$	14,040
Denominator
Shares used in computation of basic net income (loss) per share	567,408,340			566,511,108			559,367,075
Weighted-average effect of diluted securities:
Stock Options	—			—			842,047
Restricted Stock	—			—			488,773
Restricted Stock Units	—			—			7,153,674
Employee Stock Purchase Plan	—			—			201,504
Performance Share Units and Performance Bonus Awards	—			—			365,298
Shares used in computation of diluted net income (loss) per share	567,408,340			566,511,108			568,418,371

Basic net income (loss) per share:
Continuing operations	$	(0.04	)	$	(0.02	)	$	0.03
Discontinued operations	0.00			—			(0.00		)
Basic net income (loss) per share	$	(0.04	)	$	(0.02	)	$	0.03

Diluted net income (loss) per share:
Continuing operations	$	(0.04	)	$	(0.02	)	$	0.03
Discontinued operations	0.00			—			(0.01		)
Diluted net income (loss) per share	$	(0.04	)	$	(0.02	)	$	0.02

The following weighted-average potentially dilutive instruments are not included in the diluted net income (loss) per share calculations above because they would have had an antidilutive effect on the net income (loss) per share from continuing operations:



	Year Ended December 31,
	2019	2018	2017
Restricted stock units	33,040,043	30,552,028	8,087,545
Other stock-based compensation awards	2,511,249	2,041,099	13,000
Convertible senior notes	46,296,300	46,296,300	46,296,300
Warrants	46,296,300	46,296,300	46,296,300
Total	128,143,892	125,185,727	100,693,145

We had outstanding Market-based Performance Share Units as of December 31, 2019 that were eligible to vest into shares of common stock subject to the achievement of specified performance or market conditions. Contingently issuable shares are excluded from the computation of diluted earnings per share if, based on current period results, the shares would not be issuable if the end of the reporting period were the end of the contingency period. As of December 31, 2019, there were up to 6,820,041 shares of common stock issuable upon vesting of outstanding Market-based Performance Share Units that were excluded from the table above as the performance or market conditions were not satisfied as of the end of the period.