Products and Services (Details) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Product Information [Line Items]
Total revenue	$ 48,531,000	$ 43,555,000
Total revenue percentage change (in hundredths)	11.00%	16.00%
Catheter products [Member]
Product Information [Line Items]
Total revenue	30,320,000	26,096,000
Total revenue percentage change (in hundredths)	16.00%	36.00%
Hemostat products [Member]
Product Information [Line Items]
Total revenue	11,669,000	11,797,000
Total revenue percentage change (in hundredths)	(1.00%)	(6.00%)
Vein products [Member]
Product Information [Line Items]
Total revenue	6,367,000	5,237,000
Total revenue percentage change (in hundredths)	22.00%	(2.00%)
Total product revenue [Member]
Product Information [Line Items]
Total revenue	48,356,000	43,130,000
Total revenue percentage change (in hundredths)	12.00%	16.00%
License and collaboration revenue [Member]
Product Information [Line Items]
Total revenue	$ 175,000	$ 425,000
Total revenue percentage change (in hundredths)	(59.00%)	(26.00%)