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Stockholders' Equity and Stock-Based Compensation Nonemployee Director Restricted Stock and Restricted Stock Unit Awards (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 30, 2017 | Dec. 31, 2016 | Mar. 09, 2006
Director Restricted Stock Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock available for grant per employee | $ 110 | $ 90 | $ 60
Repurchase price per share |  |  | $ 0.01
Restricted stock subject to restrictions percent |  |  | 100.00%
Director Restricted Stock Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Award Termination Period | 10 years |  |

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- Definition Restricted Stock, Repurchase Price Per Share + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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