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Debt (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016	Dec. 31, 2016	Jan. 02, 2016	Nov. 18, 2015
Long-term debt
Exercise price of warrants (in dollars per share)	$ 0.66		$ 0.66		$ 0.66	$ 0.59
Amortization of debt discount			$ 108,000	$ 108,000
Lease payments	$ 12,000		12,000
Insurance policy payments	29,000		29,000
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		1,165,000
Warrant value recorded as debt discount	154,000		154,000
Interest Expense | SVIC Warrant
Long-term debt
Amortization of debt discount	$ 54,000	$ 108,000	$ 54,000	$ 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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