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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 28, 2012
Sep. 30, 2011
Sep. 28, 2012
Sep. 30, 2011
Net sales $ 15,866 $ 15,266 $ 47,316 $ 46,385
Cost of sales 4,690 4,816 14,194 15,445
Gross profit 11,176 10,450 33,122 30,940
General and administrative 3,450 3,683 10,942 10,985
Marketing and selling 5,507 4,439 15,536 13,098
Research and development 1,582 1,454 4,640 4,279
Other general and administrative expenses 728 137 1,980 463
Operating income (loss) (91) 737 24 2,115
Other income (expense):        
Interest income 7 7 14 24
Interest expense (65) (134) (227) (440)
Gain (loss) on foreign currency transactions 191 (277) 9 167
Other income (expense), net 87 (42) 610 358
Other income (expense), net 220 (446) 406 109
Income before provision for income taxes 129 291 430 2,224
Provision for income taxes 219 214 779 985
Net income (loss) $ (90) $ 77 $ (349) $ 1,239
Net income (loss) per share - basic (in dollars per share) $ 0.00 $ 0.00 $ (0.01) $ 0.04
Net income (loss) per share - diluted (in dollars per share) $ 0.00 $ 0.00 $ (0.01) $ 0.03
Weighted average shares outstanding - basic (in shares) 36,292 35,539 36,206 35,304
Weighted average shares outstanding - diluted (in shares) 36,292 36,953 36,206 36,507