Leases - Supplemental Balance Sheet Information Related to Operating Leases (Details) - USD ($) $ in Thousands	Oct. 02, 2020	Jan. 03, 2020
Lessee Lease Description [Line Items]
Operating lease right-of-use assets, gross	$ 15,422	$ 12,343
Less accumulated depreciation	7,697	5,659
Operating lease right-of-use assets, net	7,725	6,684
Total operating lease liability	$ 7,786	$ 6,786
Weighted-average remaining lease term (in years)	5 years 6 months	2 years 3 months 18 days
Weighted-average discount rate	2.49%	1.82%
Machinery and Equipment
Lessee Lease Description [Line Items]
Operating lease right-of-use assets, gross	$ 845	$ 765
Computer Equipment and Software
Lessee Lease Description [Line Items]
Operating lease right-of-use assets, gross	462	462
Real Property
Lessee Lease Description [Line Items]
Operating lease right-of-use assets, gross	$ 14,115	$ 11,116