Commitments and Contingencies - Schedule of Depreciation Expense for Assets Under Capital Lease (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
---|---|---|---|
Dec. 28, 2018 |
Dec. 29, 2017 |
Dec. 30, 2016 |
|
Commitments And Contingencies Disclosure [Abstract] | |||
Depreciation expense | $ 760 | $ 580 | $ 220 |