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Summary of Significant Accounting Policies - Reconciliation of Changes in Deferred Revenue (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 29, 2019 | Jun. 30, 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 | 985 | 789 |
Revenue recognized | (1,227) | (993) |
Balance, end of period | 1,983 | 2,316 |
Non-current portion of deferred revenue | 469 | 633 | $ 586
Current portion of deferred revenue | $ 1,514 | $ 1,683 | $ 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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