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Stockholders' Equity and Stock-Based Compensation (Stock-Based Compensation) (Details) (USD $)
12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Dec. 25, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation $ 4,486,990 $ 3,923,628 $ 2,583,728
Cost of product revenues
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation 513,789 613,274 590,950
Research and development
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation 366,443 577,514 428,123
Selling, general and administrative
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation 3,606,758 2,732,840 1,564,655
Restricted stock
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Unrecognized compensation expense for nonvested restricted common stock $ 4,600,000    
Unrecognized compensation expense, period for recognition 3 years