Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Financial Assets Valued on Recurring Basis (Details)

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Fair Value Measurements - Financial Assets Valued on Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 29, 2018
Dec. 30, 2017
Level 1 | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents, fair value $ 2,031 $ 2,850