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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
Jul. 04, 2014
Jun. 28, 2013
Jul. 04, 2014
Jun. 28, 2013
Net sales $ 20,048 $ 18,164 $ 40,226 $ 36,165
Cost of sales 6,381 5,544 12,675 10,891
Gross profit 13,667 12,620 27,551 25,274
General and administrative 5,321 3,923 10,717 7,881
Marketing and selling 7,026 5,659 13,164 10,945
Research and development 2,498 1,686 5,981 3,052
Medical device tax 47 45 87 104
Other general and administrative expenses 165 613 334 1,514
Operating income (loss) (1,390) 694 (2,732) 1,778
Other income (expense):        
Interest income 10 8 18 15
Interest expense (34) (41) (67) (96)
Gain (loss) on foreign currency transactions (134) 77 (68) (264)
Other income, net 126 139 287 230
Other income (expense), net (32) 183 170 (115)
Income (loss) before provision for income taxes (1,422) 877 (2,562) 1,663
Provision for income taxes 367 599 586 914
Net income (loss) $ (1,789) $ 278 $ (3,148) $ 749
Net income (loss) per share - basic (in dollars per share) $ (0.05) $ 0.01 $ (0.08) $ 0.02
Net income (loss) per share - diluted (in dollars per share) $ (0.05) $ 0.01 $ (0.08) $ 0.02
Weighted average shares outstanding - basic (in shares) 38,168 36,496 37,970 36,461
Weighted average shares outstanding - diluted (in shares) 38,168 38,342 37,970 37,887