Products and Services (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014 Category	Sep. 30, 2013	Sep. 30, 2014 Category	Sep. 30, 2013
Product Information [Line Items]
Number of product categories	3		3
Total revenue	$ 31,929,000	$ 28,009,000	$ 92,513,000	$ 81,427,000
Total revenue percentage change (in hundredths)	14.00%	14.00%	14.00%	11.00%
Catheter Products [Member]
Product Information [Line Items]
Total revenue	21,116,000	17,965,000	60,675,000	52,031,000
Total revenue percentage change (in hundredths)	18.00%	17.00%	17.00%	14.00%
Hemostat Products [Member]
Product Information [Line Items]
Total revenue	6,108,000	5,962,000	18,305,000	17,768,000
Total revenue percentage change (in hundredths)	2.00%	7.00%	3.00%	3.00%
Vein Products and Services [Member]
Product Information [Line Items]
Total revenue	4,542,000	3,999,000	13,236,000	11,398,000
Total revenue percentage change (in hundredths)	14.00%	11.00%	16.00%	14.00%
Total Product Revenue [Member]
Product Information [Line Items]
Total revenue	31,766,000	27,926,000	92,216,000	81,197,000
Total revenue percentage change (in hundredths)	14.00%	14.00%	14.00%	12.00%
License, Royalty and Collaboration [Member]
Product Information [Line Items]
Total revenue	$ 163,000	$ 83,000	$ 297,000	$ 230,000
Total revenue percentage change (in hundredths)	96.00%	(5.00%)	29.00%	(12.00%)