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Condensed Consolidated Statements of Operations (unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jul. 01, 2012
Jul. 03, 2011
Jul. 01, 2012
Jul. 03, 2011
Revenue $ 4,071 $ 5,737 $ 8,201 $ 11,284
Cost of revenue 2,026 1,966 4,397 3,905
Gross profit 2,045 3,771 3,804 7,379
Operating expenses:        
Research and development 2,452 3,312 5,254 5,115
Selling, general and administrative 2,749 2,543 5,446 5,150
Income (loss) from operations (3,156) (2,084) (6,896) (2,886)
Interest expense (24) (18) (37) (26)
Interest income and other, net (50) (13) (63) (17)
Income (loss) before income taxes (3,230) (2,115) (6,996) (2,929)
Provision for (benefit from) income taxes 6 (55) (39) 9
Net income (loss) $ (3,236) $ (2,060) $ (6,957) $ (2,938)
Net Income (loss) per share:        
Basic (in dollars per share) $ (0.08) $ (0.05) $ (0.18) $ (0.07)
Diluted (in dollars per share) $ (0.08) $ (0.05) $ (0.18) $ (0.07)
Weighted average shares:        
Basic (in shares) 40,154 38,376 39,401 38,224
Diluted (in shares) 40,154 38,376 39,401 38,224