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Debt (Narrative) (Details) - USD ($)	3 Months Ended
	Apr. 01, 2017	Apr. 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	$ 0.59
Amortization of debt discount	$ 54,000	$ 54,000
Lease payments	12,000
Insurance policy payments	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
Warrant value recorded as debt discount	154,000
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
SVIC Senior Secured Convertible Promissory Note | Interest Expense
Long-term debt
Amortization of debt discount	$ 54,000	$ 54,000

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Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense.

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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The price per share of the conversion feature embedded in the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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