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Stockholders' Equity (Schedule Of Assumptions Used To Calculate Weighted-Average Grant Date Fair Value Of Common Stock Options Granted) (Details) (USD $)
6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Stockholders' Equity [Abstract]    
Expected term (in years) 6 years 1 month 6 days 6 years 1 month 6 days
Expected volatility 121.00% 126.00%
Risk-free interest rate 1.26% 1.12%
Expected dividends      
Weighted-average grant date fair value per share $ 0.65 $ 3.10