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Notes Payable and Other Obligations - Summary of notes payable and other obligations (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 28, 2019
Dec. 29, 2018
Debt Instrument [Line Items]    
Notes payable and other obligations $ 58,215 $ 46,986
Senior credit facility 10,000 0
Current portion of notes payable and other obligations (17,578) (17,139)
Notes payable and other obligations, less current portion 40,638 29,847
Other obligations    
Debt Instrument [Line Items]    
Notes payable and other obligations 3,774 4,893
Uncollateralized promissory notes    
Debt Instrument [Line Items]    
Notes payable and other obligations 41,765 40,001
Capital leases    
Debt Instrument [Line Items]    
Notes payable and other obligations $ 2,676 $ 2,092