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 |