Net Loss Per Share

12 Months Ended

Dec. 31, 2016

9.	Net Loss Per Share

Basic and diluted net loss per share attributable to common stockholders was calculated as follows for the years ended December 31, 2016, 2015 and 2014:

	Year Ended December 31,
	2016			2015			2014
Basic net loss per share attributable to common stockholders:
Numerator:
Net loss attributable to common stockholders (in thousands)	$	(158,987	)	$	(94,495	)	$	(36,105	)
Denominator:
Weighted average common stock outstanding—basic		33,492,795			27,778,288			21,574,347
Dilutive effect of shares of common stock equivalents resulting from common stock options and preferred common stock (as converted)		—			—			—
Weighted average common stock outstanding—diluted		33,492,795			27,778,288			21,574,347
Net loss per share attributable to common stockholders—basic and diluted	$	(4.75	)	$	(3.40	)	$	(1.67	)

The following common stock equivalents outstanding as of December 31, 2016 and 2015 were excluded from the computation of diluted net loss per share for the periods presented because including them would have been anti-dilutive:

	Year Ended December 31,
	2016		2015
Stock options		3,985,935		2,643,833
Employee stock purchase plan		6,784		3,307
Restricted stock		—		42,781
		3,992,719		2,689,921