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Income Taxes (Provision for Income Taxes and Effective Tax Rates) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jul. 02, 2016
Jul. 01, 2017
Dec. 31, 2016
Income Taxes      
Provision for income taxes $ 1    
Effective tax rate (0.03%)    
Unrecognized Tax Benefits   $ 0 $ 0