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Property and Equipment (Tables)
12 Months Ended
Dec. 28, 2018
Property, Plant and Equipment [Abstract]  
Schedule of Property and Equipment
Property and equipment were as follows (in thousands): 
 
December 31,
2018
 
December 31,
2017
Leasehold improvements
$
33,941

 
$
4,715

Computer equipment and software
15,022

 
14,146

Furniture and fixtures
12,709

 
1,609

Laboratory equipment
5,668

 
5,959

Construction in progress
866

 
22,114

 
68,206

 
48,543

Less: accumulated depreciation and amortization
(17,309
)
 
(22,800
)
Property and equipment, net
$
50,897

 
$
25,743