Details about Reclassification out of Accumulated Other Comprehensive Income Components (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of revenues	$ (1,696)	$ (1,628)
Financial income (loss), net	571	441
Research and development	(9,873)	(7,914)
Sales and marketing	(2,938)	(2,845)
General and administrative	(2,125)	(1,990)
Income before taxes on income	4,917	2,263
Income tax expense (benefit)	810	463
Net income	4,107	1,800
Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	103	(3)
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	3
Research and development	125	21
Sales and marketing	8	2
General and administrative	10	2
Income before taxes on income	146	25
Income tax expense (benefit)	15	3
Net income	131	22
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	(38)	(30)
Income tax expense (benefit)	(10)	(5)
Net income	$ (28)	$ (25)