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Property and Equipment - Narrative (Details) $ in Millions		3 Months Ended
	May 02, 2017 USD ($) ft²	Mar. 30, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 29, 2017 USD ($)	Oct. 16, 2017 ft²
Property, Plant and Equipment [Line Items]
Depreciation expense		$ 0.4	$ 0.3
Construction-in-Progress
Property, Plant and Equipment [Line Items]
Construction in progress capitalized	$ 14.5	26.8
Prepaid construction costs		$ 0.6		$ 11.1
Operating Leases and Other Financing Leases | Alameda, California
Property, Plant and Equipment [Line Items]
Area of lease property (in square feet) | ft²	110,783
Optional Amendment Agreement | Alameda, California
Property, Plant and Equipment [Line Items]
Area of lease property (in square feet) | ft²					19,778
Capital Leases and Other Financing Leases
Property, Plant and Equipment [Line Items]
Tenant improvements allowance	$ 7.7

X

- Definition

Tenant Lease Improvements, Allowance

+ References

No definition available.

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- Definition

Area of a real estate property.

+ References

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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Carrying amount as of the balance sheet date of expenditures made in advance of when the economic benefit of the cost will be realized, and which will be expensed in future periods with the passage of time or when a triggering event occurs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.10)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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Amount of acquisition of long-lived, 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, furniture and fixtures, and computer equipment.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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