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Stockholders' Equity and Stock-Based Compensation (Stock-Based Compensation) (Details) (USD $)
12 Months Ended
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation $ 4,203,408 $ 4,486,990 $ 3,923,628
Cost of product revenues
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation 414,842 513,789 613,274
Research and development
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation 423,548 366,443 577,514
Selling, general and administrative
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation 3,365,018 3,606,758 2,732,840
Restricted stock
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Unrecognized compensation expense for nonvested restricted common stock $ 6,200,000