Quarterly report pursuant to Section 13 or 15(d)

Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share (Detail)

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Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Sep. 28, 2013
Sep. 29, 2012
Dec. 29, 2012
Dec. 31, 2011
Numerator:            
Net loss $ (1,399) $ (2,711) $ (14,309) $ (5,195) $ (35,978) $ (15,137)
Dividends on Series A Convertible Preferred Stock 60   124      
Net loss available to common shares $ (1,459) $ (2,711) $ (14,433) $ (5,195)    
Denominator:            
Weighted-average common shares outstanding (basic) 33,218 30,854 32,493 30,716    
Common equivalent shares from common stock options and warrants                
Weighted-average common shares outstanding (diluted) 33,218 30,854 32,493 30,716    
Basic and diluted net loss per share $ (0.04) $ (0.09) $ (0.44) $ (0.17)