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Debt (Narrative) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Dec. 30, 2017	Nov. 18, 2015
Long-term debt
Exercise price of warrants (in dollars per share)	$ 0.55		$ 0.66
Amortization of debt discount	$ 107,000	$ 108,000
SVIC Warrant
Long-term debt
Number of shares which may be purchased under warrant				2,000,000
Exercise price of warrants (in dollars per share)				$ 0.30
Fair value of warrants	1,165,000
Debt discount fees for professional services	154,000
Interest Expense | SVIC Warrant
Long-term debt
Amortization of debt discount	$ 5,400,010,700,054,000	$ 108,000
SVIC Senior Secured Convertible Promissory Note
Long-term debt
Face amount				$ 15,000,000
Interest rate (as a percent)				2.00%
Debt conversion price (in dollars per share)				$ 1.25

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