Inventories - Schedule of Inventory, Current (Details) - USD ($) $ in Thousands	Oct. 02, 2020	Jan. 03, 2020
Inventory Disclosure [Abstract]
Raw materials and purchased parts	$ 1,818	$ 3,334
Work in process	4,693	1,870
Finished goods	13,018	12,976
Total inventories, gross	19,529	18,180
Less inventory reserves	1,295	1,038
Total inventories, net	$ 18,234	$ 17,142