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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2018
Impairment of long-lived assets	$ 0	$ 0
Operating lease right-of-use assets	968
Operating lease liabilities	1,009
Outstanding principal and accrued interest	412	376
Unsecured Convertible Note Due August 2020
Outstanding principal and accrued interest	0	2,300
ASU No. 2016-02 | Adjustment
Operating lease right-of-use assets			$ 1,500
Operating lease liabilities			$ 1,500
Secured Debt [Member]
Carrying value of convertible note	14,600	14,300
Estimated fair value of convertible note	$ 11,700	11,700
Unsecured Debt [Member]
Carrying value of convertible note		2,000
Estimated fair value of convertible note		$ 1,700

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