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Commitments and Contingencies (Summary of Effect of Accounting Standard Adoption) (Details) - USD ($) $ in Thousands | Sep. 29, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Property and equipment, net | $ 24,216 |  |  |  | $ 49,428
Accrued liabilities | 3,814 |  |  |  |
Accrued liabilities | 110,071 |  |  |  | 172,036
Non-current financing lease obligation | 0 |  |  |  | 19,978
Accumulated deficit | (151,134) |  |  |  | (45,849)
Operating lease right-of-use assets, net | 32,008 |  |  |  |
Non-current deferred rent | 19,552 |  |  |  | 23,313
Non-current operating lease liabilities | 30,484 |  |  |  |
Total property and equipment, gross | 41,903 |  |  |  | 60,443
Operating lease liability | 34,298 |  |  |  |
Construction in progress |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total property and equipment, gross | 0 |  |  |  | 28,357
Leasehold improvements |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total property and equipment, gross | 8,836 |  |  |  | 3,007
Build-to-suit lease |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Property and equipment, net | 0 |  |  |  | 21,610
Accrued liabilities | 0 |  |  |  | 281
Accrued liabilities | 0 |  |  |  | 1,632
Non-current financing lease obligation |  |  |  |  | 19,978
Accumulated deficit | 281 |  |  |  |
Operating leases |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Accrued liabilities | 0 |  |  |  | 107
Accrued liabilities | 3,814 |  |  |  | 0
Non-current deferred rent |  |  |  |  | $ 1,141
Accounting Standards Update 2016-02 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating lease right-of-use assets, net |  | $ 7,200 | $ 14,300 | $ 14,400 |
Current deferred rent |  |  |  | 100 |
Noncurrent deferred rent |  |  |  | 1,100 |
Operating lease liability |  | $ 7,200 | $ 14,300 | 14,400 |
Accounting Standards Update 2016-02 | Construction in progress |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total property and equipment, gross |  |  |  | (21,600) |
Accounting Standards Update 2016-02 | Leasehold improvements |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Reimbursement for leasehold improvements | $ 3,100 |  |  |  |
Accounting Standards Update 2016-02 | Build-to-suit lease |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Property and equipment, net |  |  |  | (21,610) |
Accrued liabilities |  |  |  | (281) |
Accrued liabilities |  |  |  | (1,632) |
Non-current financing lease obligation |  |  |  | (19,978) |
Accumulated deficit |  |  |  | 281 |
Finance lease liability |  |  |  | (21,900) |
Accounting Standards Update 2016-02 | Operating leases |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Accrued liabilities |  |  |  | (107) |
Accrued liabilities |  |  |  | 2,356 |
Operating lease right-of-use assets, net |  |  |  | 14,400 |
Non-current deferred rent |  |  |  | (1,141) |
Non-current operating lease liabilities |  |  |  | $ 12,044 |

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