Net Loss Per Share (Tables)

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Basic and Diluted Net Income (Loss) per Share Attributable to Common Stockholders

The following table sets forth the computation of basic and diluted net loss:

	For the Three Months Ended March 31,
	2016			2015
	(in thousands, except share and per share data)
Net loss	$	(11,226	)	$	(9,158	)
Denominator (basic and diluted):
Weighted average common shares outstanding	94,748,645			94,033,035
Net loss per share:
Basic and diluted	$	(0.12	)	$	(0.10	)

Stock Options, Warrants to Purchase Common and Preferred Stock and Convertible Redeemable Preferred Stock Excluded from Computation of Diluted Net Income (Loss) Per Share

The following weighted-average number of outstanding employee stock options, restricted stock units and restricted stock awards, warrants to purchase common stock, and shares purchased under our ESPP were excluded from the computation of diluted net loss per share:

	For the Three Months Ended March 31,
	2016	2015
Stock options outstanding	11,497,626	7,287,369
Restricted stock units and restricted stock awards	2,841,861	578,657
Common equivalent shares from stock warrants	1,045,303	2,219,671
	15,384,790	10,085,697