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Property and Equipment (Details) - USD ($)
$ in Thousands
Mar. 29, 2019
Dec. 28, 2018
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 69,824 $ 68,206
Less: accumulated depreciation and amortization (19,271) (17,309)
Property and equipment, net 50,553 50,897 [1]
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 33,811 33,941
Computer equipment and software    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 15,110 15,022
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 12,908 12,709
Laboratory equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 6,764 5,668
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,231 $ 866
[1] The Condensed Consolidated Balance Sheet as of December 31, 2018 has been derived from the audited financial statements as of that date.