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Summary of Significant Accounting Policies - Reconciliation of Changes in Deferred Revenue (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 27, 2020 | Jun. 29, 2019 | Dec. 28, 2019 | [1]
Reconciliation of the changes in the Company's deferred revenue balance |  |  |
Balance, beginning of period | $ 1,810 | $ 2,225 |
Additions to deferral | 743 | 990 |
Revenue recognized | (1,023) | (1,232) |
Deductions from reserves | (6) |  |
Balance, end of period | 1,524 | 1,983 |
Non-current portion of deferred revenue | 302 | 469 | $ 360
Current portion of deferred revenue | $ 1,222 | $ 1,514 | $ 1,450
[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 28, 2019.

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