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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 26, 2015
Dec. 27, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefits, beginning of period $ 465 $ 129 $ 94
Additions for tax positions of prior years 0 0 0
Subtractions for tax positions of prior years 0 0 0
Additions for tax positions of current year 137 336 35
Subtractions for tax positions of current year 0 0 0
Unrecognized tax benefits, end of period 602 465 $ 129
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit 23    
Accrued interest and penalties on unrecognized tax benefits $ 116 $ 68