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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 ($)
$ / shares in Units, $ in Millions
3 Months Ended
Apr. 01, 2017
Apr. 02, 2016
Stockholders' Equity    
Expected term (in years) 6 years 1 month 6 days 6 years 1 month 6 days
Expected volatility 87.00% 113.00%
Risk-free interest rate 2.09% 1.66%
Weighted-average grant date fair value per share $ 0.75 $ 0.63
Unearned stock-based compensation related to unvested common stock options and restricted stock awards $ 2.4  
Weighted-average period over which unearned stock-based compensation is expected to be recognized 2 years 7 months 6 days