Accrued Expenses - Components of Accrued Expenses (Details) - USD ($) $ in Thousands	Jan. 02, 2021	Dec. 28, 2019
Components of accrued expenses
Customer deposits	$ 802	$ 775
Royalties payable	89	89
Sales and marketing expenses	116	100
Professional fees	125	147
Legal expenses	201	120
Accrued rent	169
Other accrued expenses	304	313
Total accrued expenses	$ 1,806	$ 1,544