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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
Sep. 28, 2019
Dec. 29, 2018
Carrying value of convertible note $ 997  
Restricted cash 2,250 $ 1,850
Operating lease assets 1,133  
Operating lease liabilities 1,180  
Secured Debt [Member]    
Carrying value of convertible note 14,500 14,300
Estimated fair value of convertible note 11,700 11,700
Unsecured Debt [Member]    
Carrying value of convertible note 1,000 2,000
Estimated fair value of convertible note $ 700 $ 1,700