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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 27, 2015
Sep. 28, 2014
Sep. 27, 2015
Sep. 28, 2014
Dec. 28, 2014
Income Tax Disclosure [Abstract]          
Net income tax (benefit) expense $ (15) $ 6 $ 46 $ (18)  
Unrecognized tax benefits 36   36   $ 51
Penalties and interest accrued     3    
Penalties and interest accrued related to uncertain tax positions 16   16    
Unrecognized tax benefits related to tax positions $ 9   $ 9