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STOCK-BASED COMPENSATION - Valuation Assumptions (Details) (Stock Options)
3 Months Ended 9 Months Ended
Sep. 29, 2013
Sep. 30, 2012
Sep. 29, 2013
Sep. 30, 2012
Stock Options
       
Black-Scholes Valuation Assumptions        
Expected dividend yield 0.00% 0.00% 0.00% 0.00%
Expected stock price volatility 84.00% 81.00% 84.00% 81.00%
Risk-free interest rate 1.50% 0.70% 0.90% 0.80%
Expected life of options in years 4 years 4 months 22 days 5 years 4 years 4 months 22 days 5 years