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Significant Accounting Policies (Details) (USD $)	12 Months Ended
Significant Accounting Policies (Details) (USD $)	Dec. 30, 2012	Jan. 01, 2012	Jan. 02, 2011
Finite-Lived Intangible Assets [Line Items]
Operating expenses denominated in foreign currency (as a percent)	19.00%	16.00%	16.00%
Gain/loss on disposal of equipment	$ 25,000	$ 102,000	$ 8,000
Operating loss carryforward	60,300,000
Valuation allowance	$ 60,223,000	$ 56,067,000
Licensed Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	5 years

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.