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Property and Equipment - Narrative (Details) $ in Thousands | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 29, 2018 USD ($) | Jun. 29, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 ft² | Dec. 29, 2017 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |
Depreciation expense |  | $ 1,200 | $ 600 |  |
Fair value of buildings | $ 78,898 | 78,898 |  |  | $ 48,543
Financing obligations included in other current liabilities | 700 | 700 |  |  |
Financing obligation for build-to-suit lease | 20,646 | 20,646 |  |  | 14,530
Leasehold Improvements, Buildings, Furniture and Fixtures, Computer Equipment and Software |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Construction in progress capitalized | 59,500 |  |  |  |
Construction in Progress |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Fair value of buildings | 1,839 | 1,839 |  |  | 22,114
Buildings |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Fair value of buildings | $ 14,530 | $ 14,530 |  |  | $ 0
Estimated useful life | 40 years |  |  |  |
Operating Leases and Other Financing Leases | Alameda, California |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Area of lease property (in square feet) | ft² |  |  |  | 134,765 |

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- Definition Amount of capital lease obligation due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 2: 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(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45023-112735 + Details
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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45023-112735 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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