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Summary of Significant Accounting Policies - Reconciliation of Changes in Deferred Revenue (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 28, 2019 | Sep. 29, 2018 | Dec. 29, 2018 | [1]
Reconciliation of the changes in the Company's deferred revenue balance |  |  |
Balance, beginning of period | $ 2,225 | $ 2,520 |
Additions to deferral | 1,575 | 1,426 |
Revenue recognized | (1,906) | (1,729) |
Balance, end of period | 1,894 | 2,217 |
Non-current portion of deferred revenue | 366 | 608 | $ 586
Current portion of deferred revenue | $ 1,528 | $ 1,609 | $ 1,639
[1] | Derived from the audited consolidated financial statements included in the Annual Report on Form 10-K filed with the SEC for the year ended December 29, 2018.

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