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Summary of Significant Accounting Policies - Reconciliation of Changes in Deferred Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 29, 2018 | Dec. 30, 2017
Reconciliation of the changes in the Company's deferred revenue balance |  |
Balance, beginning of period | $ 2,520 | $ 1,383
Additions to deferral | 1,984 | 2,451
Revenue recognized | (2,279) | (1,314)
Balance, end of period | $ 2,225 | $ 2,520

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