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Reconciliation Between Effective Tax Rate and U.S. Statutory Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income before taxes on income	$ 16,425	$ 7,381	$ 2,033
Theoretical tax at U.S. statutory rate	5,585	2,510	691
Foreign income taxes at rates other than U.S. rate	(1,831)	(958)	(489)
Approved and benefited enterprises benefits	(2,767)	(1,653)	(785)
Subpart F	538	434	394
Non-deductible items	682	349	723
Non-taxable items	(505)	(481)	(230)
Changes in uncertain tax position	505		(920)
Changes in valuation allowance	1,212	839	3,356
Other, net	(94)	74	112
Taxes on income	$ 3,325	$ 1,114	$ 2,852

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