Net Loss per Share (Tables)

9 Months Ended

Sep. 30, 2016

Net Loss per Share

Basic and diluted net loss per common share

	Three months ended				Nine months ended
	September 30,				September 30,
(in thousands, except per share data)	2016		2015		2016		2015
Basic and diluted loss per share:
Net loss	$	(26,017)	$	(17,630)	$	(57,858)	$	(47,315)
Weighted-average common shares outstanding		52,012		46,380		51,422		20,252
Less:  weighted-average unvested common shares subject to repurchase		—		(1,436)		(121)		(1,531)
Weighted-average number of shares used in computing net loss per share, basic and diluted		52,012		44,944		51,301		18,721
Basic and diluted net loss per share	$	(0.50)	$	(0.39)	$	(1.13)	$	(2.53)

Potentially dilutive shares not included in the calculation of dilutive EPS

	September 30,
	2016	2015
	(in thousands)
Options to purchase common stock	9,146	9,399
Warrants to purchase common stock	377	410
Restricted stock units	174	—
Employee stock purchase plan	145	—
Common stock subject to repurchase	—	1,403
	9,842	11,212