CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 29, 2013	Mar. 30, 2012
Net sales	$ 18,001	$ 15,509
Cost of sales	5,347	4,607
Gross profit	12,654	10,902
General and administrative	3,958	3,860
Marketing and selling	5,286	4,663
Research and development	1,366	1,546
Medical device tax	59	0
Other general and administrative expenses	901	555
Operating income	1,084	278
Other income (expense):
Interest income	35	0
Interest expense	(83)	(95)
Gain (loss) on foreign currency transactions	(341)	67
Other income, net	90	214
Total other income (expense), net	(299)	186
Income before provision for income taxes	785	464
Provision for income taxes	314	232
Net income	$ 471	$ 232
Net income per share - basic (in dollars per share)	$ 0.01	$ 0.01
Net income per share - diluted (in dollars per share)	$ 0.01	$ 0.01
Weighted average shares outstanding - basic (in shares)	36,427	36,071
Weighted average shares outstanding - diluted (in shares)	37,418	38,420