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Property and Equipment
 12 Months Ended
Dec. 28, 2019
Property, Plant and Equipment [Abstract]  
Property and Equipment
7.
Property and Equipment
Property and equipment consists of the following (in thousands):
 
December 28,
2019
 
December 29,
2018
Computer and equipment
$
13,588

 
$
12,339

Furniture and fixtures
6,494

 
5,231

Machinery and tooling
79,213

 
60,281

Leasehold improvements
39,538

 
28,701

Business applications software
17,933

 
15,638

Subtotal
156,766

 
122,190

Less: accumulated depreciation
80,778

 
65,164

Property and equipment, net
$
75,988

 
$
57,026


As of December 28, 2019 and December 29, 2018, the net book value of capitalized internal-use software costs was $6.8 million and $4.7 million, respectively, which are included within business applications software.
Depreciation expense for the years ended December 28, 2019, December 29, 2018 and December 30, 2017 was $24.4 million, $17.0 million, and $12.3 million, respectively, which included amortization expense of $1.5 million, $1.2 million and $1.5 million, respectively, for capitalized internal-use software.