Net Loss per Share

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

Net Loss per Share

16. Net Loss per Share

The following table sets forth the computation of the Company’s basic and diluted net loss per share of common stock (in thousands, except for share and per share amounts):

	Years Ended December 31,
	2014			2013			2012
Net loss attributable to Imperva, Inc. stockholders	$	(58,963	)	$	(25,178	)	$	(7,387	)
Shares used in computing net loss per share of common stock, basic and diluted		25,805,632			24,300,198			22,916,426
Net loss per share of common stock, basic and diluted	$	(2.28	)	$	(1.04	)	$	(0.32	)

The following outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share of common stock for the periods presented because including them would have been antidilutive:

	Years Ended December 31,
	2014		2013		2012
Stock options to purchase common stock		2,244,363		1,675,506		1,989,237
Restricted stock units for common stock		2,279,081		1,044,651		446,915
Restricted shares of common stock subject to repurchase		217,621		335,062		530,779
Restricted stock issued in connection with Skyfence acquisition		355,499		—		—
Common stock warrants		—		—		8,333