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Property and Equipment
 12 Months Ended
Jan. 01, 2021
Property, Plant and Equipment [Abstract]  
Property and Equipment PROPERTY AND EQUIPMENT
Property and equipment consisted of the following (in thousands):
Estimated Useful Lives
December 31,
 
20202019
Leasehold improvements
up to 15 years
$40,694 $33,904 
Computer equipment and software3 years18,376 17,338 
Furniture and fixtures7 years14,931 13,053 
Laboratory equipment5 years11,707 8,904 
Construction in progress16,360 1,253 
102,068 74,452 
Less: accumulated depreciation(34,684)(25,560)
Property and equipment, net$67,384 $48,892 
Depreciation expense was $9.1 million, $8.3 million and $4.9 million during the years ended December 31, 2020, 2019 and 2018, respectively.