Condensed Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Net revenue:        
Products and license $ 14,044 $ 11,379 $ 26,096 $ 21,357
Services 10,510 7,447 19,976 13,892
Total net revenue 24,554 18,826 46,072 35,249
Cost of revenue:        
Products and license 2,274 1,705 4,128 3,076
Services 3,139 2,206 5,872 4,169
Total cost of revenue 5,413 3,911 10,000 7,245
Gross profit 19,141 14,915 36,072 28,004
Operating Expenses:        
Research and development 4,925 4,316 9,918 8,243
Sales and marketing 11,926 10,559 23,522 20,559
General and administrative 3,739 2,829 7,232 5,123
Total operating expenses 20,590 17,704 40,672 33,925
Loss from operations (1,449) (2,789) (4,600) (5,921)
Other income (expense), net 11 (86) (59) (175)
Loss before provision for income taxes (1,438) (2,875) (4,659) (6,096)
Provision for (benefit from) income tax 227 150 380 266
Net loss (1,665) (3,025) (5,039) (6,362)
Loss attributable to noncontrolling interest 132 149 235 280
Net loss attributable to Imperva, Inc. stockholders $ (1,533) $ (2,876) $ (4,804) $ (6,082)
Net loss per share of common stock attributable to Imperva, Inc. stockholders, basic and diluted $ (0.07) $ (0.53) $ (0.21) $ (1.16)
Shares used in computing net loss per share of common stock, basic and diluted 22,582,977 5,392,495 22,443,228 5,223,140