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Income Taxes (Details 2)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Company's effective tax rate differs from the statutory federal income tax rate
Income tax provision at statutory rate	34.00%	34.00%	34.00%
State income taxes, net of federal benefit	88.00%	(2.00%)	(1.00%)
Permanent differences	89.00%	0.00%	3.00%
Research and development credits	0.00%	(4.00%)	(4.00%)
Change in valuation allowance	180.00%	(16.00%)	(16.00%)
Effective tax rate	37.00%	12.00%	16.00%

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Effective income tax rate reconciliation permanent differences.

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A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to changes in the valuation allowance for deferred tax assets.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by research tax credits generated or utilized under enacted tax laws during the period.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to state and local income tax settlements during the period.

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