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Property and Equipment - Narrative (Details) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 29, 2018 USD ($)	Sep. 28, 2018 USD ($) ft²	Sep. 29, 2017 USD ($)	Sep. 28, 2018 USD ($) ft²	Sep. 29, 2017 USD ($)
Property, Plant and Equipment [Line Items]
Depreciation expense		$ 1.7	$ 0.3	$ 2.9	$ 0.8
Leasehold Improvements, Buildings, Furniture and Fixtures, Computer Equipment and Software
Property, Plant and Equipment [Line Items]
Construction in progress capitalized	$ 46.3
Operating Leases and Other Financing Leases | Alameda, California
Property, Plant and Equipment [Line Items]
Area of lease property (in square feet) | ft²		134,765		134,765

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- Definition

Property, Plant And Equipment, Additions And Transfers

+ References

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- Definition

Area of a real estate property.

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 28
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