Leases - Supplemental Balance Sheet Information Related to Operating Leases (Details) - USD ($) $ in Thousands	Jan. 01, 2021	Jan. 03, 2020
Lessee Lease Description [Line Items]
Operating lease ROU assets, gross	$ 14,278	$ 12,343
Less accumulated depreciation	5,514	5,659
Operating lease ROU assets, net	8,764	6,684
Total operating lease liability	$ 9,022	$ 6,786
Weighted-average remaining lease term (in years)	5 years 2 months 12 days	2 years 3 months 18 days
Weighted-average discount rate	2.61%	1.82%
Machinery and Equipment
Lessee Lease Description [Line Items]
Operating lease ROU assets, gross	$ 860	$ 765
Computer Equipment and Software
Lessee Lease Description [Line Items]
Operating lease ROU assets, gross	462	462
Real Property
Lessee Lease Description [Line Items]
Operating lease ROU assets, gross	$ 12,956	$ 11,116