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Details about Reclassification out of Accumulated Other Comprehensive Income (Loss) Components (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Cost of revenues $ (1,628) $ (1,185)
Financial income, net 441 (27)
Research and development (7,914) (7,363)
Sales and marketing (2,845) (2,426)
General and administrative (1,990) (1,972)
Income before taxes on income 2,263 536
Income tax expense (benefit) 463 50
Net income 1,800 486
Reclassification out of accumulated other comprehensive income (loss)    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net income (3) (78)
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   (1)
Research and development 21 (62)
Sales and marketing 2 (5)
General and administrative 2 (5)
Income before taxes on income 25 (73)
Income tax expense (benefit) 3 (8)
Net income 22 (65)
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 (30) (13)
Income tax expense (benefit) (5)  
Net income $ (25) $ (13)