CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Apr. 04, 2014	Mar. 29, 2013
Net sales	$ 20,178	$ 18,001
Cost of sales	6,294	5,347
Gross profit	13,884	12,654
General and administrative	5,396	3,958
Marketing and selling	6,138	5,286
Research and development	3,484	1,366
Medical device tax	40	59
Other general and administrative expenses	168	901
Operating income (loss)	(1,342)	1,084
Other income (expense):
Interest income	9	35
Interest expense	(33)	(83)
Gain (loss) on foreign currency transactions	66	(341)
Other income, net	160	90
Total other income (expense), net	202	(299)
Income (loss) before provision for income taxes	(1,140)	785
Provision for income taxes	219	314
Net income (loss)	$ (1,359)	$ 471
Net income (loss) per share - basic (in dollars per share)	$ (0.04)	$ 0.01
Net income (loss) per share - diluted (in dollars per share)	$ (0.04)	$ 0.01
Weighted average shares outstanding - basic (in shares)	37,794	36,427
Weighted average shares outstanding - diluted (in shares)	37,794	37,418