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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

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