Net Loss per Share (Tables)

9 Months Ended

Sep. 30, 2017

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)	2017		2016		2017		2016
Numerator:
Net loss, basic and diluted	$	(27,119)	$	(26,017)	$	(90,812)	$	(57,858)
Denominator:
Weighted-average shares outstanding		53,447		52,012		53,100		51,422
Less:  weighted-average unvested shares subject to repurchase		—		—		—		(121)
Weighted-average number of shares used in computing net loss per share, basic and diluted		53,447		52,012		53,100		51,301
Net loss per share, basic and diluted	$	(0.51)	$	(0.50)	$	(1.71)	$	(1.13)

Total outstanding potentially dilutive shares not included in the calculation of dilutive EPS

	September 30,
	2017	2016
	(in thousands)
Options to purchase common stock	9,959	9,146
Warrants to purchase common stock	377	377
Restricted stock units	379	174
Employee stock purchase plan	201	145
	10,916	9,842