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Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 30, 2018	Dec. 29, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 68,583	$ 48,543
Less: accumulated depreciation and amortization	(23,171)	(22,800)
Property and equipment, net	45,412	25,743	[1]
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	14,772	14,146
Laboratory equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	5,959	5,959
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,715	4,715
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,609	1,609
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 41,528	$ 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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- Definition

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

+ References

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-Publisher FASB
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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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