NET INCOME (LOSS) PER SHARE (Tables)

12 Months Ended

Dec. 31, 2019

Schedule of Basic and Diluted Net Income (Loss) Per Share

The following table presents the calculation of basic and diluted net income (loss) per share (in thousands, except per share data):


	Year Ended December 31,
	2019		2018		2017
Net income (loss)	$	375,446	$	(38,453)	$	(62,813)
Basic shares:
Weighted-average common shares outstanding	425,728		406,313		380,921
Weighted-average unvested shares	(729)		(582)		(1,577)
Weighted-average shares used to compute basic net income (loss) per share	424,999		405,731		379,344
Diluted shares:
Stock options and restricted stock units	30,602		—		—
Convertible senior notes	—		—		—
Common stock warrants	10,432		—		—
Employee stock purchase plan	43		—		—
Weighted-average shares used to compute diluted net income (loss) per share	$	466,076	$	405,731	$	379,344

Net income (loss) per share:
Basic	$	0.88	$	(0.09)	$	(0.17)
Diluted	$	0.81	$	(0.09)	$	(0.17)

Schedule of Antidilutive Securities Excluded from Calculation of Diluted Net Income (Loss) Per Share

The following potential common shares were excluded from the calculation of diluted net income (loss) per share because their effect would have been anti-dilutive for the periods presented (in thousands):


	Year Ended December 31,
	2019	2018	2017
Stock options and restricted stock units	13,867	60,589	68,588
Common stock warrants	19,820	25,798	19,173


Convertible senior notes	20,305	23,820	—
Unvested shares	728	582	1,300
Employee stock purchase plan	165	140	157
Total anti-dilutive securities	54,885	110,929	89,218