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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Jan. 03, 2014
Dec. 28, 2012
Dec. 30, 2011
Net sales $ 72,215 $ 63,783 $ 62,765
Cost of sales 21,906 19,492 20,396
Gross profit 50,309 44,291 42,369
Selling, general and administrative expenses:      
General and administrative 16,568 15,150 14,932
Marketing and selling 23,888 21,281 17,726
Research and development 6,708 6,444 5,868
Medical device excise tax 203 0 0
Other general and administrative expenses 2,242 2,636 1,060
Operating income (loss) 700 (1,220) 2,783
Other income (expense):      
Interest income 59 59 32
Interest expense (170) (291) (523)
Gain on foreign currency transactions 39 111 86
Other income, net 486 822 326
Other income (expense), net 414 701 (79)
Income (loss) before provision for income taxes 1,114 (519) 2,704
Provision for income taxes 716 1,244 1,356
Net income (loss) $ 398 $ (1,763) $ 1,348
Net income (loss) per share - basic (in dollars per share) $ 0.01 $ (0.05) $ 0.04
Net income (loss) per share - diluted (in dollars per share) $ 0.01 $ (0.05) $ 0.04
Weighted average shares outstanding - basic (in shares) 36,706 36,253 35,434
Weighted average shares outstanding - diluted (in shares) 38,607 36,253 36,878