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Stock-Based Compensation (Details)	12 Months Ended
Stock-Based Compensation (Details)	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Stock Options [Member]
Assumption of stock option's fair value
Expected life		4 years 6 months	4 years 6 months
Volatility	77.30%	77.00%	74.20%
Risk free interest rate	0.80%	1.82%	2.04%
Dividends	0.00%	0.00%	0.00%
Employee Stock Purchase Plan [Member]
Assumption of stock option's fair value
Expected life		6 months	6 months
Volatility	45.50%	73.40%	80.30%
Risk free interest rate	0.12%	0.19%	0.20%
Dividends	0.00%	0.00%	0.00%

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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