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Property and Equipment (Tables)
6 Months Ended
Jun. 29, 2018
Property, Plant and Equipment [Abstract]  
Property and Equipment
Property and equipment consisted of the following (in thousands): 
 
June 30,
2018
 
December 31,
2017
Leasehold improvements
$
41,003

 
$
4,715

Computer equipment and software
15,507

 
14,146

Buildings
14,530

 

Furniture and fixtures
4,028

 
1,609

Laboratory equipment
1,991

 
5,959

Construction in progress
1,839

 
22,114

 
78,898

 
48,543

Less: accumulated depreciation and amortization
(14,154
)
 
(22,800
)
Property and equipment, net
$
64,744

 
$
25,743