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Taxes on Income - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 04, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Taxes [Line Items] |  |  |  |
Unrecognized tax benefits |  | $ 3,076,000 | $ 2,859,000 | $ 3,563,000
Accrued interest related to unrecognized tax benefits |  | 54,000 | 39,000 |
Accrue penalties related to unrecognized tax benefits |  | 0 | $ 0 |
Net operating loss carryforwards, federal |  | $ 7,020,000 |  |
Loss carryforwards begin to expire |  | 2030 |  |
Excess tax benefits from stock option exercises |  | $ 5,750,000 |  |
Income not eligible for Approved Enterprise benefits |  |  |  |
Income Taxes [Line Items] |  |  |  |
Effective income tax rate |  | 26.50% | 26.50% | 25.00%
Israel | Subsequent Event |  |  |  |
Income Taxes [Line Items] |  |  |  |
Effective income tax rate | 26.50% |  |  |
Reduce in income tax rate | 25.00% |  |  |
Israel | Foreign ownership exceeds 90% |  |  |  |
Income Taxes [Line Items] |  |  |  |
Effective income tax rate |  | 10.00% |  |
Israel | Foreign ownership exceeds 49% |  |  |  |
Income Taxes [Line Items] |  |  |  |
Effective income tax rate |  | 20.00% |  |
Israel | Minimum |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax exemption period, undistributed income |  | 2 years |  |
Israel | Maximum |  |  |  |
Income Taxes [Line Items] |  |  |  |
Effective income tax rate |  | 25.00% |  |
Tax exemption period, undistributed income |  | 10 years |  |
Ireland |  |  |  |
Income Taxes [Line Items] |  |  |  |
Effective income tax rate |  | 12.50% |  |
Open tax years |  | Subject to review by the applicable taxing authorities for the Irish subsidiary, are 2010 and subsequent years. |  |
Net operating loss carryforwards, foreign |  | $ 62,837,000 |  |
Ireland | Interest income |  |  |  |
Income Taxes [Line Items] |  |  |  |
Effective income tax rate |  | 25.00% |  |
France |  |  |  |
Income Taxes [Line Items] |  |  |  |
Effective income tax rate |  | 33.33% |  |
Open tax years |  | Subject to review by the applicable taxing authorities for the French subsidiaries, are 2013 and subsequent years. |  |
Net operating loss carryforwards, foreign |  | $ 1,438,000 |  |
California state |  |  |  |
Income Taxes [Line Items] |  |  |  |
Loss carryforwards begin to expire |  | 2016 |  |
Net operating loss carryforwards |  | $ 6,913,000 |  |
Excess tax benefits from stock option exercises |  | $ 4,512,000 |  |

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