v3.8.0.1
Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Sep. 30, 2017
Sep. 24, 2016
Jan. 01, 2017
Operating Loss Carryforwards [Line Items]          
Income tax expense (benefit) $ (647) $ 332 $ (1,503) $ 952  
Foreign Tax Authority          
Operating Loss Carryforwards [Line Items]          
Operating loss carryforwards         $ 2,200
State and Local Jurisdiction          
Operating Loss Carryforwards [Line Items]          
Operating loss carryforwards         $ 1,900