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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
--- | --- | ---
Oct. 03, 2014 | Sep. 27, 2013 | Oct. 03, 2014 | Sep. 27, 2013
Net sales | $ 18,188 | $ 17,106 | $ 58,414 | $ 53,271
Cost of sales | 6,319 | 5,047 | 18,995 | 15,939
Gross profit | 11,869 | 12,059 | 39,419 | 37,332
General and administrative | 3,250 | 4,140 | 13,968 | 12,021
Marketing and selling | 7,026 | 5,527 | 20,189 | 16,471
Research and development | 3,137 | 1,684 | 9,118 | 4,736
Medical device tax | 9 | 45 | 96 | 149
Other general and administrative expenses | 0 | 490 | 334 | 2,004
Operating income (loss) | (1,553) | 173 | (4,286) | 1,951
Other income (expense): |  |  |  |
Interest income | 7 | 9 | 26 | 23
Interest expense | (35) | (38) | (102) | (134)
Gain (loss) on foreign currency transactions | (628) | 226 | (696) | (38)
Other income, net | 51 | 130 | 338 | 360
Other income (expense), net | (605) | 327 | (434) | 211
Income (loss) before provision (benefit) for income taxes | (2,158) | 500 | (4,720) | 2,162
Provision (benefit) for income taxes | 548 | (25) | 1,134 | 888
Net income (loss) | $ (2,706) | $ 525 | $ (5,854) | $ 1,274
Net income (loss) per share - basic (in dollars per share) | $ (0.07) | $ 0.01 | $ (0.15) | $ 0.03
Net income (loss) per share - diluted (in dollars per share) | $ (0.07) | $ 0.01 | $ (0.15) | $ 0.03
Weighted average shares outstanding - basic (in shares) | 38,369 | 36,750 | 38,044 | 36,552
Weighted average shares outstanding - diluted (in shares) | 38,369 | 39,284 | 38,044 | 38,482

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