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Inventories - Schedule of Inventory, Current (Details) - USD ($)
$ in Thousands
Jul. 03, 2020
Jan. 03, 2020
Inventory Disclosure [Abstract]    
Raw materials and purchased parts $ 1,606 $ 3,334
Work in process 4,997 1,870
Finished goods 12,487 12,976
Total inventories, gross 19,090 18,180
Less inventory reserves 1,254 1,038
Total inventories, net $ 17,836 $ 17,142