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Restructuring Costs - Narrative (Details)
ft² in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 29, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 29, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 30, 2017
USD ($)
ft²
Employee
Restructuring Cost and Reserve [Line Items]          
Restructuring costs $ 378 $ 0 $ 1,717 $ 0  
Employee Severance [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring costs     (55)    
Restructuring Plan 2017 [Member]          
Restructuring Cost and Reserve [Line Items]          
Manufacturing facility square footage (in sqft) | ft²         160
Expected restructuring costs $ 1,920   1,920    
Restructuring costs     1,717    
Restructuring Plan 2017 [Member] | Employee Severance [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring costs     (55)   $ 203
Restructuring Plan 2017 [Member] | Relocation Of Machinery And Equipment And Administrative Offices [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring costs     1,318    
Restructuring Plan 2017 [Member] | Employee Retention, Facility Closing, And Other Closure Costs [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring costs     $ 454    
Restructuring Plan 2017 [Member] | United States [Member]          
Restructuring Cost and Reserve [Line Items]          
Number of positions eliminated related to restructuring | Employee         4
Restructuring Plan 2017 [Member] | Sweden [Member]          
Restructuring Cost and Reserve [Line Items]          
Number of positions eliminated related to restructuring | Employee         6