Net Income (Loss) Per Common Share (Tables)

12 Months Ended

Dec. 31, 2017

Components of Basic and Diluted Net Income (Loss) Per Common Share Computations

The following tables summarize the components of the basic and diluted net income (loss) per common share computations (in thousands, except per share amounts):

	Year Ended December 31,
	2017			2016		2015
Basic EPS:
Net (loss) income (numerator)	$	(117,333	)	$	125,664	$	(368,445	)
Weighted average common shares (denominator)		104,245			92,053		81,233
Net (loss) income per share	$	(1.13	)	$	1.37	$	(4.54	)

Diluted EPS:
Net (loss) income (numerator)	$	(117,333	)	$	125,664	$	(368,445	)
Weighted average common shares		104,245			92,053		81,233

Effect of dilutive securities - common shares issuable		—			32		—
Adjusted weighted average common shares (denominator)		104,245			92,085		81,233

Net (loss) income per share	$	(1.13	)	$	1.36	$	(4.54	)

Potential Dilutive Securities Outstanding that are Considered Antidilutive

Potentially dilutive securities outstanding that are considered antidilutive are summarized as follows (in shares):

	December 31,
	2017		2016		2015
Exercise of common stock options		7,089,440		5,530,256		3,955,845
Conversion of convertible notes into common stock		6,875,272		814,561		814,561
Employee stock purchase plan		136,660		43,672		33,986
Exercise of common stock warrants		31,856		9,740,597		814,919
Vesting of restricted stock units		1,135,216		702,867		360,924
		15,268,444		16,831,953		5,980,235