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Details about Reclassification out of Accumulated Other Comprehensive Income (Loss) Components (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Cost of revenues $ (5,424) $ (5,000) $ (5,163)
Financial income, net 1,069 975 2,714
Research and development (28,113) (25,828) (21,216)
Sales and marketing (10,168) (9,815) (10,092)
General and administrative (8,184) (8,054) (7,670)
Income before taxes on income 7,381 2,033 7,473
Income tax expense (benefit) 1,114 2,852 788
Net income 6,267 (819) 6,685
Reclassification out of accumulated other comprehensive income (loss)      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net income 23 (343) 732
Reclassification out of accumulated other comprehensive income (loss) | Unrealized gains (losses) on cash flow hedges      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Cost of revenues   (17) 13
Research and development 91 (305) 432
Sales and marketing 5 (34) 27
General and administrative 8 (26) 43
Income before taxes on income 104 (382) 515
Income tax expense (benefit) 11 (36) 54
Net income 93 (346) 461
Reclassification out of accumulated other comprehensive income (loss) | Unrealized gains (losses) on available-for-sale marketable securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Financial income, net (78) 6 379
Income tax expense (benefit) (8) 3 108
Net income $ (70) $ 3 $ 271