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Debt Obligations - Revolving Line of Credit (Details) - USD ($)
6 Months Ended
Sep. 28, 2018
Jun. 30, 2019
Dec. 30, 2018
Dec. 21, 2018
Liquidity [Line Items]        
Revolving line of credit   $ 15,000,000 $ 15,000,000  
Heritage Bank | Revolving Line of Credit        
Liquidity [Line Items]        
Line of credit aggregate commitments $ 9,000,000     $ 15,000,000
Line of credit facility, maturity date Sep. 28, 2020 Sep. 28, 2020    
Minimum cash required for covenant related to credit facility       $ 3,000,000
Line of credit interest rate 0.50%      
Revolving line of credit   $ 15,000,000 $ 15,000,000  
Interest rate   6.00% 6.00%