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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Income before taxes on income | $ 18,899 | $ 16,425 | $ 7,381
Theoretical tax at U.S. statutory rate | 6,426 | 5,585 | 2,510
Foreign income taxes at rates other than U.S. rate | (2,304) | (1,831) | (958)
Approved and benefited enterprises benefits | (2,698) | (2,767) | (1,653)
Subpart F | 737 | 538 | 434
Non-deductible items | 294 | 682 | 349
Non-taxable items | (529) | (505) | (481)
Changes in uncertain tax position | (1,757) | 505 |
Stock-based compensation expense | (1,503) |  |
Deemed mandatory repatriation | 1,916 |  |
Changes in valuation allowance | 2,076 | 1,212 | 839
Other, net | (787) | (94) | 74
Taxes on income | $ 1,871 | $ 3,325 | $ 1,114

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