Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net revenue:
Products and license	$ 74,299	$ 72,153	$ 59,490
Services	89,711	65,606	44,745
Total net revenue	164,010	137,759	104,235
Cost of revenue:
Products and license	9,248	8,756	8,530
Services	27,335	20,940	13,374
Total cost of revenue	36,583	29,696	21,904
Gross profit	127,427	108,063	82,331
Operating expenses:
Research and development	43,052	27,556	20,555
Sales and marketing	106,382	81,500	53,509
General and administrative	34,499	24,436	15,371
Amortization of acquired intangible assets	1,269	0	0
Total operating expenses	185,202	133,492	89,435
Loss from operations	(57,775)	(25,429)	(7,104)
Other income (expense), net	(220)	(125)	(243)
Loss before provision for income taxes	(57,995)	(25,554)	(7,347)
Provision for income taxes	1,181	777	545
Net loss	(59,176)	(26,331)	(7,892)
Loss attributable to noncontrolling interest	213	1,153	505
Net loss attributable to Imperva, Inc. stockholders	$ (58,963)	$ (25,178)	$ (7,387)
Net loss per share of common stock attributable to Imperva, Inc. stockholders, basic and diluted	$ (2.28)	$ (1.04)	$ (0.32)
Shares used in computing net loss per share of common stock, basic and diluted	25,805,632	24,300,198	22,916,426