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Condensed Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Jun. 29, 2013
Jun. 30, 2012
Condensed Consolidated Statements Of Operations [Abstract]        
Net sales $ 5,065 $ 10,552 $ 11,029 $ 24,519
Cost of sales 4,818 [1] 7,814 [1] 10,216 [1] 16,345 [1]
Gross profit 247 2,738 813 8,174
Operating expenses:        
Research and development 1,457 [1] 3,770 [1] 3,299 [1] 7,612 [1]
Selling, general and administrative 1,571 [1] 2,871 [1] 3,327 [1] 5,480 [1]
Total operating expenses 3,028 6,641 6,626 13,092
Operating loss (2,781) (3,903) (5,813) (4,918)
Other income (expense):        
Interest expense, net (88) (79) (218) (150)
Other income (expense), net 7 3 1 8
Total other expense, net (81) (76) (217) (142)
Loss before provision for income taxes (2,862) (3,979) (6,030) (5,060)
Provision for income taxes 1 1 3 1
Net loss $ (2,863) $ (3,980) $ (6,033) $ (5,061)
Net loss per common share:        
Basic and diluted $ (0.09) $ (0.14) $ (0.20) $ (0.18)
Weighted-average common shares outstanding:        
Weighted Average Number of Shares Outstanding, Basic and Diluted 30,320 28,111 30,263 27,420
[1] Amounts include stock-based compensation expense as follows:Cost of sales$ 11$ 42$ 23$ 77Research and development 118 153 278 345Selling, general and administrative 240 287 502 583