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Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Jan. 01, 2011
Consolidated Statements Of Operations [Abstract]    
Net sales $ 60,729 $ 37,855
Cost of sales 40,468 [1] 27,910 [1]
Gross profit 20,261 9,945
Operating expenses:    
Research and development 14,924 [1] 14,762 [1]
Selling, general and administrative 10,705 [1] 11,041 [1]
Total operating expenses 25,629 25,803
Operating loss (5,368) (15,858)
Other (expense) income:    
Interest expense, net (228) (42)
Other (expense) income, net (56) 71
Total other (expense) income, net (284) 29
Loss before income tax benefit (5,652) (15,829)
Income tax benefit (53) (714)
Net loss $ (5,599) $ (15,115)
Net loss per common share:    
Basic and diluted $ (0.22) $ (0.64)
Weighted-average common shares outstanding:    
Basic and diluted 25,086 23,779
[1] Amounts include stock-based compensation expense as follows: Cost of sales $ 79 $ 42 Research and development 600 357 Selling, general and administrative 941 1,083