Net Loss per Share (Tables)

3 Months Ended

Mar. 31, 2018

Net Loss per Share

Basic and diluted net loss per common share

	Three months ended
	March 31,
(in thousands, except per share data)	2018		2017
			(As Revised)
Numerator:
Net loss used to compute net loss per share, basic	$	(32,873)	$	(33,480)
Less:  Remeasurement gain on warrant liability		—		(1,042)
Net loss used to compute net loss per share, diluted	$	(32,873)	$	(34,522)
Denominator:
Weighted-average number of shares used in computing net loss per share, basic		54,132		52,758
Add:  incremental shares from assumed exercise of warrants		—		285
Weighted-average number of shares used in computing net loss per share, diluted		54,132		53,043
Net loss per share, basic	$	(0.61)	$	(0.63)
Net loss per share, diluted	$	(0.61)	$	(0.65)

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

	March 31,
	2018	2017
	(in thousands)
Options to purchase common stock	10,732	8,774
Warrants to purchase common stock	377	—
Restricted stock units	1,014	138
Employee stock purchase plan	181	207
	12,304	9,119