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Property and Equipment - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Sep. 27, 2019
Sep. 28, 2018
Property, Plant and Equipment [Abstract]        
Depreciation expense $ 2.1 $ 1.7 $ 6.1 $ 2.9