Net Loss Per Share (Tables)

6 Months Ended

Jun. 30, 2014

Net Loss Per Share

Schedule of basic and diluted net loss per share

Basic and diluted net loss per share is calculated as follows (in thousands, except share and per share numbers):

	Three Months EndedJune 30,						Six Months EndedJune 30,
	2014			2013			2014			2013
Numerator:
Net loss	$	(12,609	)	$	(19,512	)	$	(27,097	)	$	(27,817	)
Accretion of Preferred Stock	(4,031		)	(4,368		)	(9,000		)	(7,950		)
Loss attributable to common stockholders - basic and diluted	$	(16,640	)	$	(23,880	)	$	(36,097	)	$	(35,767	)
Denominator:
Weighted-average number of common shares used in loss per share - basic and diluted (1)	7,500,148			381,525			3,962,559			380,942
Loss per share - basic and diluted	$	(2.22	)	$	(62.59	)	$	(9.11	)	$	(93.89	)

(1) Common shares adjusted for 2.28:1 stock split that was affected April 24, 2014.

Schedule of potentially dilutive securities excluded from the computation of diluted weighted-average shares outstanding

	Three Months EndedJune 30,		Six Months EndedJune 30,
	2014	2013	2014	2013
Convertible preferred stock	7,043,931	7,041,888	7,779,266	6,452,734
Options to purchase common stock	2,621,820	1,706,787	2,373,083	1,708,460
Warrants	1,311,356	589,328	1,161,639	303,751