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Property and Equipment (Schedule of Property and Equipment) (Details) - USD ($) $ in Thousands	Dec. 29, 2017	Dec. 30, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 48,543	$ 26,953
Less: accumulated depreciation and amortization	(22,800)	(24,882)
Property and equipment, net	25,743	2,071
Computer equipment and software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	14,146	13,738
Lab equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	5,959	4,310
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,715	6,646
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,609	2,240
Construction-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 22,114	$ 19

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
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-Section S99
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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