CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2013	Jun. 29, 2012	Jun. 28, 2013	Jun. 29, 2012
Net sales	$ 18,164	$ 15,942	$ 36,165	$ 31,451
Cost of sales	5,544	4,897	10,891	9,504
Gross profit	12,620	11,045	25,274	21,947
General and administrative	3,923	3,633	7,881	7,493
Marketing and selling	5,659	5,366	10,945	10,029
Research and development	1,686	1,513	3,052	3,059
Medical device tax	45	0	104	0
Other general and administrative expenses	613	697	1,514	1,252
Operating income (loss)	694	(164)	1,778	114
Other income (expense):
Interest income	8	7	15	7
Interest expense	(41)	(67)	(96)	(162)
Gain (loss) on foreign currency transactions	77	(249)	(264)	(182)
Other income, net	139	309	230	523
Other income (expense), net	183	0	(115)	186
Income (loss) before provision for income taxes	877	(164)	1,663	300
Provision for income taxes	599	327	914	559
Net income (loss)	$ 278	$ (491)	$ 749	$ (259)
Net income (loss) per share - basic (in dollars per share)	$ 0.01	$ (0.01)	$ 0.02	$ (0.01)
Net income (loss) per share diluted (in dollars per share)	$ 0.01	$ (0.01)	$ 0.02	$ (0.01)
Weighted average shares outstanding - basic (in shares)	36,496	36,257	36,461	36,164
Weighted average shares outstanding - diluted (in shares)	38,342	36,257	37,887	36,164