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Venture Capital Investments and Marketable Securities - Summary of Marketable Securities (Details) - USD ($)
$ in Thousands
Jun. 25, 2016
Dec. 26, 2015
Schedule of Available-for-sale Securities [Line Items]    
Cost $ 4,650 $ 4,650
Gross Unrealized Gains 0 0
Gross Unrealized Losses (23) (141)
Fair Value 4,627 4,509
Mutual fund    
Schedule of Available-for-sale Securities [Line Items]    
Cost 4,650 4,650
Gross Unrealized Gains 0 0
Gross Unrealized Losses (23) (141)
Fair Value $ 4,627 $ 4,509