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Summary of Significant Accounting Policies - Recent Accounting Standards (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2017 | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
Recent Accounting Standards |  |  |  |
Income tax benefit |  | $ (7,463) | $ (7,656) | $ (5,490)
ASU 2016-09 |  |  |  |
Recent Accounting Standards |  |  |  |
Income tax benefit | $ 50 |  |  |
ASU 2016-09 | Scenario, Adjustment [Member] |  |  |  |
Recent Accounting Standards |  |  |  |
Income tax benefit | $ 50 |  |  |
Minimum | ASU 2014-09 |  |  |  |
Recent Accounting Standards |  |  |  |
Increase in cumulative effect adjustment on opening balance of retained earnings |  | 300 |  |
Maximum | ASU 2014-09 |  |  |  |
Recent Accounting Standards |  |  |  |
Increase in cumulative effect adjustment on opening balance of retained earnings |  | $ 700 |  |

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