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Details about Reclassification out of Accumulated Other Comprehensive Income (Loss) Components (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Cost of revenues $ (6,086) $ (5,424) $ (5,000)
Financial income, net 2,039 1,069 975
Research and development (30,838) (28,113) (25,828)
Sales and marketing (11,540) (10,168) (9,815)
General and administrative (8,567) (8,184) (8,054)
Income before taxes on income 16,425 7,381 2,033
Income tax expense (benefit) 3,325 1,114 2,852
Net income (loss) 13,100 6,267 (819)
Reclassification out of accumulated other comprehensive income (loss)      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net income (loss) 135 23 (343)
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 4   (17)
Research and development 132 91 (305)
Sales and marketing 12 5 (34)
General and administrative 13 8 (26)
Income before taxes on income 161 104 (382)
Income tax expense (benefit) 18 11 (36)
Net income (loss) 143 93 (346)
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 (9) (78) 6
Income tax expense (benefit) (1) (8) 3
Net income (loss) $ (8) $ (70) $ 3