Summary of Significant Accounting Policies and Nature of Operations - Long-Lived Assets and Intangibles Subject to Amortization (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017
Future estimated annual amortization expense
2019	$ 100
2020	100
2021	100
2022	100
2023	23
Thereafter	42
Total	$ 465	$ 651