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Condensed Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Condensed Consolidated Statements Of Operations [Abstract]    
Net sales $ 5,963 $ 13,967
Cost of sales 5,397 [1] 8,531 [1]
Gross profit 566 5,436
Operating expenses:    
Research and development 1,842 [1] 3,842 [1]
Selling, general and administrative 1,756 [1] 2,609 [1]
Total operating expenses 3,598 6,451
Operating loss (3,032) (1,015)
Other income (expense):    
Interest expense, net (130) (71)
Other income (expense), net (6) 5
Total other expense, net (136) (66)
Loss before provision for income taxes (3,168) (1,081)
Provision for income taxes 2   
Net loss $ (3,170) $ (1,081)
Net loss per common share:    
Basic and diluted $ (0.10) $ (0.04)
Weighted-average common shares outstanding:    
Weighted Average Number of Shares Outstanding, Basic and Diluted 30,205 26,729
[1] Amounts include stock-based compensation expense as follows:Cost of sales$ 12$ 35Research and development 160 192Selling, general and administrative 262 296