Net Loss Per Share

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Net Loss Per Share

Net Loss Per Share

The following tables present the calculation of basic and diluted net loss per share attributable to common stockholders (in thousands, except share and per share data):

	Year Ended December 31,
	2017			2016			2015
Numerator:
Net loss	$	(149,130	)	$	(451,804	)	$	(198,426	)
Denominator:
Weighted-average shares outstanding - basic and diluted	171,175,577			164,533,823			155,706,643
Net loss per share - basic and diluted	$	(0.87	)	$	(2.75	)	$	(1.27	)

Potentially dilutive securities that are not included in the calculation of diluted net loss per share because doing so would be antidilutive are as follows:

	Year Ended December 31,
	2017	2016	2015
Common stock options	3,369,732	5,818,435	8,255,554
Restricted stock units	11,403,341	12,222,282	12,417,805
ESPP obligations	361,688	366,529	254,728
2018 Notes	7,782,946	7,783,023	7,783,023
2018 Warrants	7,783,023	7,783,023	7,783,023
2022 Notes	5,806,933	—	—
2022 Warrants	5,806,933	—	—
Total potentially dilutive securities	42,314,596	33,973,292	36,494,133