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Reconciliation Between Effective Tax Rate and U.S. Statutory Rate (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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