Inventories, Net - Schedule of Inventory, Current (Details) - USD ($) $ in Thousands	Jan. 01, 2021	Jan. 03, 2020
Inventory Disclosure [Abstract]
Raw materials and purchased parts	$ 3,679	$ 3,334
Work in process	2,174	1,870
Finished goods	13,717	12,976
Total inventories, gross	19,570	18,180
Less inventory reserves	1,459	1,038
Total inventories, net	$ 18,111	$ 17,142