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Leases - Components of Lease Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 28, 2019
Jun. 29, 2018
Jun. 28, 2019
Jun. 29, 2018
Leases [Abstract]        
Operating lease cost $ 660 $ 952 $ 1,100 $ 1,973
Variable lease cost 131 531 380 1,003
Total lease costs $ 791 $ 1,483 $ 1,480 $ 2,976