Inventories, Net - Schedule of Inventory, Current (Details) - USD ($) $ in Thousands	Jan. 03, 2020	Dec. 28, 2018
Inventory Disclosure [Abstract]
Raw materials and purchased parts	$ 3,334	$ 2,678
Work in process	1,870	2,195
Finished goods	12,976	13,214
Total inventories, gross	18,180	18,087
Less inventory reserves	1,038	1,383
Total inventories, net	$ 17,142	$ 16,704