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Stockholders' Equity - Restricted Stock Units Outstanding, Vested and Expected to Vest (Details) - Restricted Stock Units (RSUs) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Restricted stock units outstanding, vested and expected to vest |  |  |
Restricted stock units outstanding, Number of Shares | 411,133 | 597,121 | 361,148
Restricted stock units outstanding, Weighted Average Remaining Contractual Life (years) | 1 year 3 months 7 days |  |
Restricted stock units outstanding, Aggregate Intrinsic Value | $ 966 |  |
Restricted stock units vested and expected to vest, Number of Shares | 350,639 |  |
Restricted stock units vested and expected to vest, Weighted Average Remaining Contractual Life (years) | 1 year 2 months 15 days |  |
Restricted stock units vested and expected to vest, Aggregate Intrinsic Value | $ 824 |  |

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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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