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Income Taxes - Reconciliation to Federal Statutory Amount (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Income Tax Disclosure [Abstract]
Expense (benefit) from income taxes computed at the federal statutory tax rate	$ 6,022	$ (3,998)	$ (4,746)
Expense (benefit) from state income taxes, net of federal benefit	595	(474)	(623)
Valuation allowance change	(6,319)	4,318	5,656
Nondeductible items	403	288	232
Alternative minimum tax	232	0	0
Other	188	19	(207)
Provision for income taxes	$ 1,121	$ 153	$ 312

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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