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Details about Reclassification out of Accumulated Other Comprehensive Income (Loss) Components (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Cost of revenues $ (6,953) $ (6,086) $ (5,424)
Financial income, net 3,026 2,039 1,069
Research and development (40,385) (30,838) (28,113)
Sales and marketing (12,572) (11,540) (10,168)
General and administrative (10,488) (8,567) (8,184)
Income before taxes on income 18,899 16,425 7,381
Income tax expense (benefit) 1,871 3,325 1,114
Net income 17,028 13,100 6,267
Reclassification out of accumulated other comprehensive income (loss)      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net income 169 135 23
Reclassification out of accumulated other comprehensive income (loss) | Unrealized gains on cash flow hedges      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Cost of revenues 4 4  
Research and development 162 132 91
Sales and marketing 10 12 5
General and administrative 13 13 8
Income before taxes on income 189 161 104
Income tax expense (benefit) 21 18 11
Net income 168 143 93
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)
Income tax expense (benefit) (1) (1) (8)
Net income $ 1 $ (8) $ (70)