Property and Equipment, net - Components of Property and Equipment, net (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 78,847				$ 73,952
Less accumulated depreciation and amortization	(51,232)				(43,548)
Total property and equipment, net	27,615	$ 25,696	$ 26,841	$ 28,079	30,404
Assets not yet in service
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,111				301
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	11,906				9,823
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	12,839				12,094
Computer and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	36,119				34,894
Transportation equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	13,519				14,043
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,353				$ 2,797