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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

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