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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. 27, 2013
Sep. 28, 2012
Sep. 27, 2013
Sep. 28, 2012
Net sales $ 17,106 $ 15,866 $ 53,271 $ 47,316
Cost of sales 5,047 4,690 15,939 14,194
Gross profit 12,059 11,176 37,332 33,122
General and administrative 4,140 3,450 12,021 10,942
Marketing and selling 5,527 5,507 16,471 15,536
Research and development 1,684 1,582 4,736 4,640
Medical device tax 45 0 149 0
Other general and administrative expenses 490 728 2,004 1,980
Operating income (loss) 173 (91) 1,951 24
Other income (expense):        
Interest income 9 7 23 14
Interest expense (38) (65) (134) (227)
Gain (loss) on foreign currency transactions 226 191 (38) 9
Other income, net 130 87 360 610
Other income, net 327 220 211 406
Income before provision (benefit) for income taxes 500 129 2,162 430
Provision (benefit) for income taxes (25) 219 888 779
Net income (loss) $ 525 $ (90) $ 1,274 $ (349)
Net income (loss) per share - basic (in dollars per share) $ 0.01 $ 0.00 $ 0.03 $ (0.01)
Net income (loss) per share - diluted (in dollars per share) $ 0.01 $ 0.00 $ 0.03 $ (0.01)
Weighted average shares outstanding - basic (in shares) 36,750 36,292 36,552 36,206
Weighted average shares outstanding - diluted (in shares) 39,284 36,292 38,482 36,206