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Income Taxes - Provision For Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Federal income taxes:      
Current $ 232 $ 0 $ 0
Deferred 0 0 0
State income taxes:      
Current 962 235 160
Deferred 0 0 0
Foreign income taxes:      
Current (70) (68) 134
Deferred (3) (14) 18
Provision for income taxes $ 1,121 $ 153 $ 312