Taxes on Income - Additional Information (Detail) € in Thousands		12 Months Ended
	Dec. 29, 2016	Dec. 31, 2018	Dec. 31, 2017 USD ($)	Dec. 31, 2017 ILS (₪)	Dec. 31, 2017 EUR (€)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Income Taxes [Line Items]
Effective income tax rate			35.00%	35.00%	35.00%
Transition income tax			$ 5,635,000
Consolidated revenue			87,507,000			$ 72,653,000	$ 59,499,000
Unrecognized tax benefits			2,224,000			3,784,000	$ 3,076,000
Accrued interest related to unrecognized tax benefits			0			130,000
Accrue penalties related to unrecognized tax benefits			0			$ 0
Decrease in unrecognized tax benefit from prior years tax audit			3,003,000
Net operating loss carryforwards, federal			$ 12,541,000
Loss carryforwards begin to expire			2030	2030	2030
Scenario Forecast
Income Taxes [Line Items]
Effective income tax rate		21.00%
Income not eligible for Approved Enterprise benefits
Income Taxes [Line Items]
Effective income tax rate			24.00%	24.00%	24.00%	25.00%	26.50%
Foreign tax jurisdictions
Income Taxes [Line Items]
Accrued interest related to unrecognized tax benefits			$ 130,000
Decrease in unrecognized tax benefit from prior years tax audit			$ 1,805,000
Israel Tax Authority | Intellectual Property
Income Taxes [Line Items]
Effective income tax rate			12.00%	12.00%	12.00%
French Government | January 1, 2018 | Income up to 500,000 Euros
Income Taxes [Line Items]
Effective income tax rate			28.00%	28.00%	28.00%
French Government | January 1, 2018 | Income above 500,000 Euros
Income Taxes [Line Items]
Effective income tax rate			33.33%	33.33%	33.33%
French Government | Tax Year 2019 | Income up to 500,000 Euros
Income Taxes [Line Items]
Effective income tax rate			28.00%	28.00%	28.00%
French Government | Tax Year 2019 | Income above 500,000 Euros
Income Taxes [Line Items]
Effective income tax rate			31.00%	31.00%	31.00%
French Government | Tax Year 2020
Income Taxes [Line Items]
Effective income tax rate			28.00%	28.00%	28.00%
French Government | Tax Year 2021
Income Taxes [Line Items]
Effective income tax rate			26.50%	26.50%	26.50%
French Government | Tax Year 2022
Income Taxes [Line Items]
Effective income tax rate			25.00%	25.00%	25.00%
Dividends Paid to Foreign Companies | Israel Tax Authority
Income Taxes [Line Items]
Effective income tax rate			4.00%	4.00%	4.00%
Maximum | Technological Preferred Enterprise
Income Taxes [Line Items]
Consolidated revenue | ₪				₪ 10,000,000,000
Maximum | French Government | January 1, 2018
Income Taxes [Line Items]
Taxable income | €					€ 500,000
Maximum | French Government | Tax Year 2019
Income Taxes [Line Items]
Taxable income | €					€ 500,000
Ireland
Income Taxes [Line Items]
Effective income tax rate			12.50%	12.50%	12.50%
Open tax years			Subject to review by the applicable taxing authorities for the Irish subsidiary, are 2012 and subsequent years.	Subject to review by the applicable taxing authorities for the Irish subsidiary, are 2012 and subsequent years.	Subject to review by the applicable taxing authorities for the Irish subsidiary, are 2012 and subsequent years.
Net operating loss carryforwards, foreign			$ 61,608,000
Ireland | Interest income
Income Taxes [Line Items]
Effective income tax rate			25.00%	25.00%	25.00%
Israel
Income Taxes [Line Items]
Open tax years			Subject to review by the applicable taxing authorities for the Israeli subsidiary, are 2014 and subsequent years.	Subject to review by the applicable taxing authorities for the Israeli subsidiary, are 2014 and subsequent years.	Subject to review by the applicable taxing authorities for the Israeli subsidiary, are 2014 and subsequent years.
Israel | Tax Year 2016
Income Taxes [Line Items]
Effective income tax rate	24.00%
Israel | January 1, 2017
Income Taxes [Line Items]
Effective income tax rate	25.00%
Israel | January 1, 2018
Income Taxes [Line Items]
Effective income tax rate	23.00%
Israel | Foreign ownership exceeds 90%
Income Taxes [Line Items]
Effective income tax rate			10.00%	10.00%	10.00%
Israel | Foreign ownership exceeds 49%
Income Taxes [Line Items]
Effective income tax rate			20.00%	20.00%	20.00%
Israel | Minimum
Income Taxes [Line Items]
Tax exemption period, undistributed income			2 years	2 years	2 years
Israel | Maximum
Income Taxes [Line Items]
Effective income tax rate			24.00%	24.00%	24.00%
Tax exemption period, undistributed income			10 years	10 years	10 years
France
Income Taxes [Line Items]
Effective income tax rate			33.33%	33.33%	33.33%
Open tax years			Subject to review by the applicable taxing authorities for the French subsidiaries, are 2015 and subsequent years.	Subject to review by the applicable taxing authorities for the French subsidiaries, are 2015 and subsequent years.	Subject to review by the applicable taxing authorities for the French subsidiaries, are 2015 and subsequent years.
Net operating loss carryforwards, foreign			$ 6,807,000
California state
Income Taxes [Line Items]
Loss carryforwards begin to expire			2030	2030	2030
Net operating loss carryforwards			$ 8,279,000
Development Area A | Israel Tax Authority | Intellectual Property
Income Taxes [Line Items]
Effective income tax rate			7.50%	7.50%	7.50%