Net Loss per Share

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

Net Loss per Share

14. 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,
	2014			2013			2012
Net loss attributable to common stockholders - basic    and diluted	$	(83,072	)	$	(18,497	)	$	(13,217	)
Weighted-average shares outstanding		18,921,533			450,061			130,718
Less: weighted average shares subject to repurchase		—			(61	)		(15,499	)
Weighted-average shares used to compute basic and    diluted net loss per share		18,921,533			450,000			115,219
Basic and diluted net loss per common share	$	(4.39	)	$	(41.10	)	$	(114.71	)

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, 2014, 2013 and 2012, 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,
	2014		2013		2012
Convertible preferred stock		—		10,491,140		5,991,757
Warrants to purchase convertible preferred stock (1)		—		173,912		173,912
Options to purchase common stock		2,723,366		1,403,655		462,471
Convertible notes		—		—		885,024
Restricted stock units		185,514		—		—

(1) Assumes exercise of warrants to purchase convertible preferred stock at $5.17 per share.