Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders

Basic and diluted net loss per share attributable to common stockholders was calculated as follows for the years ended December 31, 2017, 2016 and 2015:

	Year ended December 31,
(In thousands)	2017			2016			2015
Numerator:
Net loss	$	(137,481	)	$	(71,894	)	$	(46,315	)
Net loss:	$	(137,481	)	$	(71,894	)	$	(46,315	)
Denominator:
Weighted average common shares outstanding, basic and diluted		33,027			25,297			21,497
Net loss per share, basic and diluted	$	(4.16	)	$	(2.84	)	$	(2.15	)

Schedule of Common Stock Equivalents Excluded from Calculation of Diluted Net Loss Per Share, as Including them Would have Anti-dilutive Effect

The following common stock equivalents were excluded from the calculation of diluted net loss per share as including them would have an anti-dilutive effect:

	Year ended December 31,
	2017		2016
Shares issuable upon conversion of the 2024 convertible notes		5,017		—
Stock Options		3,602		2,345
Restricted Stock Units		147		188
		8,766		2,533