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Summary of Benefit from Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016
Income Tax Expense Benefit [Line Items]
US federal statutory tax rate	$ 508	$ (5,741)
State income taxes (net of federal benefit)	477	(403)
Loss on cessation of Spanish operations	(11,940)	0
Research and development credit	(874)	0
Tax shortfall on share-based awards	1,184	0
Increase in valuation allowance	1,353	405
Other	164	136
Total tax benefit	$ (9,128)	$ (5,603)

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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