Net Loss per Share

12 Months Ended

Dec. 31, 2016

15. Net loss per share

The following table summarizes the computation of basic and diluted net loss per share attributable to common stockholders of the Company (in thousands, except per share data):

	December 31,
	2016			2015			2014
Net loss attributable to common stockholders - basic and diluted	$	(95,817	)	$	(82,177	)	$	(83,072	)
Weighted-average shares used to compute basic and diluted net loss per share		30,784			28,964			18,922
Basic and diluted net loss per common share	$	(3.11	)	$	(2.84	)	$	(4.39	)

Basic net loss attributable to common stockholders per share is computed by dividing the net loss attributable to common stockholders by the weighted-average number of common shares outstanding for the period. Diluted net loss attributable to common stockholders per share is computed by dividing the net loss attributable to common stockholders by the weighted-average number of common shares and dilutive common stock equivalents outstanding for the period, determined using the treasury-stock method and the as-if converted method, for convertible securities, if inclusion of these is dilutive. Because the Company has reported a net loss for the years ended December 31, 2016, 2015, and 2014, diluted net loss per common share is the same as basic net loss per common share for those years.

The following potentially dilutive securities outstanding at the end of the years presented have been excluded from the computation of diluted shares outstanding:

	December 31,
	2016		2015		2014
Options to purchase common stock		4,452,700		3,240,969		2,723,366
Restricted stock units		502,027		254,067		185,514