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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Stock-based compensation expense $ 1,736 $ 1,547 $ 5,346 $ 4,283
Unrecognized compensation expense related to stock awards $ 6,698   $ 6,698  
Recognition period     1 year 8 months 12 days