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Details about Reclassification out of Accumulated Other Comprehensive Income Components (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Cost of revenues $ (1,726) $ (1,422) $ (5,030) $ (4,453)
Financial income (loss), net 821 615 2,147 1,617
Research and development (10,031) (7,346) (30,413) (23,071)
Sales and marketing (3,057) (2,763) (9,422) (8,463)
General and administrative (2,711) (2,218) (7,388) (6,286)
Income before taxes on income 7,031 4,403 14,873 9,874
Income tax expense (benefit) 1,181 1,015 1,008 1,975
Net income 5,850 3,388 13,865 7,899
Reclassification out of accumulated other comprehensive income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net income 2 61 142 158
Reclassification out of accumulated other comprehensive income | Unrealized gains (losses) on cash flow hedges        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Cost of revenues   2 4 4
Research and development (2) 57 160 160
Sales and marketing   5 10 13
General and administrative   5 12 14
Income before taxes on income (2) 69 186 191
Income tax expense (benefit) 1 8 20 20
Net income (3) $ 61 166 171
Reclassification out of accumulated other comprehensive income | Unrealized gains (losses) on available-for-sale marketable securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Financial income (loss), net 7   (33) (16)
Income tax expense (benefit) 2   (9) (3)
Net income $ 5   $ (24) $ (13)