Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Consolidated Statements of Operations [Abstract]
Net sales	$ 15,382	$ 13,928
Cost of sales	4,176	4,058
Gross profit	11,206	9,870
Sales and marketing	5,768	5,213
General and administrative	2,882	2,668
Research and development	1,273	1,135
Medical device excise tax	160
Total operating expenses	10,083	9,016
Income from operations	1,123	854
Other income (expense):
Interest income	1	7
Interest expense	(4)
Foreign currency loss	(50)	(198)
Income before income taxes	1,070	663
Provision for income taxes	224	277
Net income	$ 846	$ 386
Earnings per share of common stock:
Basic	$ 0.06	$ 0.03
Diluted	$ 0.05	$ 0.02
Weighted-average shares outstanding:
Basic	15,219	15,294
Diluted	15,648	15,726
Cash dividends declared per common share	$ 0.030	$ 0.025