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Income Taxes - Summary of Benefit from Income Taxes (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Apr. 01, 2017	Dec. 30, 2017
Income Tax Disclosure [Abstract]
U.S. federal statutory tax rate	21.00%	35.00%	35.00%
State income taxes (net of federal benefit)	2.90%	32.90%
Cessation of operations	(7.00%)	(822.90%)
Research and development credit	(1.60%)	(60.20%)
Tax (windfall) shortfall on share-based awards	(68.50%)	81.60%
Section 162m limitation	1.00%	0.00%
Increase in valuation allowance due to net operating loss	1.60%	93.30%
Impact of Foreign Ops	1.00%	0.00%
Other	1.90%	11.10%
Total effective tax rate	(47.70%)	(629.20%)

X

- Definition

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

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates.

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