Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
CURRENT ASSETS:
Cash and cash equivalents	$ 68,096	$ 76,704
Short-term investments	41,624	38,381
Restricted cash	62	34
Accounts receivable, net of allowance for doubtful accounts of $215 and $ 410 as of December 31, 2014 and 2013, respectively	47,446	44,446
Inventory	259	512
Deferred tax assets	408	341
Prepaid expenses and other current assets	3,927	3,972
Total current assets	161,822	164,390
Property and equipment, net	7,618	5,475
Goodwill	34,972	0
Acquired intangible assets, net	9,399	0
Severance pay fund	3,980	4,140
Restricted cash	1,665	1,252
Deferred tax assets	329	42
Other assets	860	1,192
TOTAL ASSETS	220,645	176,491
CURRENT LIABILITIES:
Accounts payable	5,376	3,948
Accrued compensation and benefits	15,749	12,930
Accrued and other current liabilities	6,376	3,961
Deferred revenue	56,077	40,337
Total current liabilities	83,578	61,176
Other liabilities	10,408	1,993
Deferred revenue	25,098	22,715
Accrued severance pay	4,318	4,385
TOTAL LIABILITIES	123,402	90,269
Commitments and Contingencies (Note 11)
STOCKHOLDERS' EQUITY:
Preferred stock, $0.0001 par value-5,000,000 shares authorized, no shares issued and outstanding as of December 31, 2014 and 2013, respectively	0	0
Common stock, $0.0001 par value-145,000,000 shares authorized, 26,895,480 and 25,206,498 shares issued and outstanding as of December 31, 2014 and 2013, respectively	2	2
Additional paid-in capital	256,388	187,957
Accumulated deficit	(157,658)	(98,695)
Accumulated other comprehensive loss	(1,489)	(428)
TOTAL IMPERVA, INC. STOCKHOLDERS' EQUITY	97,243	88,836
Noncontrolling interest	0	(2,614)
TOTAL STOCKHOLDERS' EQUITY	97,243	86,222
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 220,645	$ 176,491