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Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 28, 2018	Dec. 30, 2017	Dec. 29, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 66,901		$ 48,543
Less: accumulated depreciation and amortization	(15,855)		(22,800)
Property and equipment, net	51,046	$ 11,213	25,743	[1]
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	42,581		4,715
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	15,533		14,146
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,780		1,609
Laboratory equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,936		5,959
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,071		$ 22,114
[1] The Condensed Consolidated Balance Sheet as of December 31, 2017 has been derived from the audited financial statements as of that date.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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