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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