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Related Party Transactions - Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2019
USD ($)
May 31, 2019
USD ($)
Sep. 26, 2020
USD ($)
lease
Sep. 28, 2019
USD ($)
Jun. 29, 2019
USD ($)
Sep. 26, 2020
USD ($)
lease
Sep. 28, 2019
USD ($)
Dec. 31, 2019
USD ($)
Mar. 30, 2019
USD ($)
Related Party Transaction                  
Gain on sale of business     $ 287,000 $ (240,000)   $ 2,697,000 $ 1,551,000    
VPI                  
Related Party Transaction                  
Operating lease assets               $ 3,739,000 $ 3,739,000
Affiliated Entity                  
Related Party Transaction                  
Unrecorded unconditional purchase obligation   $ 7,000,000.0              
Unrecorded unconditional purchase obligation, amount remaining     1,900,000     1,900,000      
Due from related parties     $ 0     $ 0      
Sale of Subsidiary | Affiliated Entity | Board of Directors Member                  
Related Party Transaction                  
Proceeds from the divestiture of business   $ 6,500,000              
Gain on sale of business         $ 2,800,000        
Acquired Lease | Affiliated Entity | VPI                  
Related Party Transaction                  
Number of operating leases | lease     2     2      
Operating lease assets     $ 3,600,000     $ 3,600,000     $ 3,600,000
Increase in operating lease assets $ 600,000