Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 27, 2020	Dec. 27, 2019
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 74,508	$ 72,141
Less accumulated depreciation	(30,022)	(27,600)
Total property and equipment, net	44,486	44,541
Machinery
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	35,449	33,684
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	28,001	27,835
Office Furniture, Fixtures and Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	1,038	1,040
Vehicles
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	26	26
Construction-In-Progress
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	4,074	3,760
Computer Software, Hardware and Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 5,920	$ 5,796