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Summary of Significant Accounting Policies - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | Jan. 01, 2018 | Jan. 01, 2017
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Deferred income tax assets, net | $ 0 |
Accounting Standards Update 2016-09 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Deferred income tax assets, net |  | $ 4,000
Credit to retained earnings | (4,454) | 4,000
Accounting Standards Update 2016-09 | Retained Earnings |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Credit to retained earnings | $ (4,454) | $ 4,000

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