Net Loss per Share (Tables)

12 Months Ended

Dec. 31, 2018

Net Loss per Share

Basic and diluted net loss per common share

	Year ended December 31,
(in thousands, except per share data)	2018		2017		2016
			(As Revised)		(As Revised)
Numerator:
Net loss used to compute net loss per share, basic	$	(128,154)	$	(137,628)	$	(100,327)
Less:  Remeasurement gain on warrant liability		—		(1,148)		—
Net loss used to compute net loss per share, diluted	$	(128,154)	$	(138,776)	$	(100,327)
Denominator:
Weighted-average common shares outstanding		57,848		53,312		51,667
Less:  Weighted-average unvested common shares subject to repurchase		—		—		(91)
Weighted-average number of shares used in computing net loss per share, basic		57,848		53,312		51,576
Add:  Incremental shares from assumed exercise of warrants		—		292		—
Weighted-average number of shares used in computing net loss per share, diluted		57,848		53,604		51,576
Net loss per share, basic	$	(2.22)	$	(2.58)	$	(1.95)
Net loss per share, diluted	$	(2.22)	$	(2.59)	$	(1.95)

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

	As of December 31,
	2018	2017	2016
Options to purchase common stock	9,463	9,963	9,043
Warrants to purchase common stock	—	—	377
Restricted stock units	1,084	389	159
Employee stock purchase plan	42	79	90
	10,589	10,431	9,669