Leases - Supplemental Balance Sheet Information Related to Operating Leases (Details) - USD ($) $ in Thousands	Apr. 03, 2020	Jan. 03, 2020
Lessee Lease Description [Line Items]
Operating lease right-of-use assets, gross	$ 12,332	$ 12,343
Less accumulated depreciation	6,294	5,659
Operating lease right-of-use assets, net	6,038	6,684
Total operating lease liability	$ 6,143	$ 6,786
Weighted-average remaining lease term (in years)	2 years 3 months 18 days	2 years 3 months 18 days
Weighted-average discount rate	1.63%	1.82%
Machinery and Equipment
Lessee Lease Description [Line Items]
Operating lease right-of-use assets, gross	$ 781	$ 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	$ 11,089	$ 11,116