Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
CURRENT ASSETS:
Cash and cash equivalents	$ 70,747	$ 76,704	[1]
Short-term investments	35,167	38,381	[1]
Restricted cash	34	34	[1]
Accounts receivable, net of allowance for doubtful accounts of $707 and $410 as of March 31, 2014 and December 31, 2013, respectively	28,576	44,446	[1]
Inventory	693	512	[1]
Deferred tax assets	360	341	[1]
Prepaid expenses and other current assets	3,890	3,972	[1]
Total current assets	139,467	164,390	[1]
Property and equipment, net	6,493	5,475	[1]
Goodwill	34,972
Acquired intangible assets, net	10,465	0
Severance pay fund	4,360	4,140	[1]
Restricted cash	1,252	1,252	[1]
Deferred tax assets	42	42	[1]
Other assets	1,196	1,192	[1]
TOTAL ASSETS	198,247	176,491	[1]
CURRENT LIABILITIES:
Accounts payable	3,634	3,948	[1]
Accrued compensation and benefits	12,521	12,930	[1]
Accrued and other current liabilities	4,554	3,961	[1]
Deferred revenue	40,160	40,337	[1]
Total current liabilities	60,869	61,176	[1]
Other liabilities	10,444	1,993	[1]
Deferred revenue	20,867	22,715	[1]
Accrued severance pay	4,793	4,385	[1]
TOTAL LIABILITIES	96,973	90,269	[1]
Commitments and Contingencies (Note 9)			[1]
STOCKHOLDERS' EQUITY:
Preferred stock, $0.0001 par value - 5,000,000 shares authorized, no shares issued and outstanding as of March 31, 2014 and December 31, 2013, respectively			[1]
Common stock, $0.0001 par value - 145,000,000 shares authorized, 26,288,419 and 25,206,498 shares issued and outstanding as of March 31, 2014 and December 31, 2013, respectively	2	2	[1]
Additional paid-in capital	217,803	187,957	[1]
Accumulated deficit	(116,106)	(98,695)	[1]
Accumulated other comprehensive income (loss)	(425)	(428)	[1]
TOTAL IMPERVA, INC. STOCKHOLDERS' EQUITY	101,274	88,836	[1]
Noncontrolling interest		(2,614)	[1]
TOTAL STOCKHOLDERS' EQUITY	101,274	86,222	[1]
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 198,247	$ 176,491	[1]

[1] The Condensed Consolidated Balance Sheet as of December 31, 2013 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.