Segment And Geographic Information (Summary Of Net Revenues By Product) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Product Information [Line Items]
Total revenues	$ 35,457	$ 36,250	$ 33,520	$ 35,536	$ 32,800	$ 33,429	$ 33,188	$ 32,301	$ 30,397	$ 29,654	$ 29,379	$ 30,196	$ 140,763		$ 131,718		$ 119,626
BioGlue And BioFoam [Member]
Product Information [Line Items]
Total revenues													58,004		53,211		49,455
PerClot [Member]
Product Information [Line Items]
Total revenues													3,494		3,078		2,528
HemoStase [Member]
Product Information [Line Items]
Total revenues																	1,699
Revascularization Technologies [Member]
Product Information [Line Items]
Total revenues													8,965		8,092		5,705
HeRO Graft [Member]
Product Information [Line Items]
Total revenues													5,731		3,115
Total Products [Member]
Product Information [Line Items]
Total revenues													76,194		67,496		59,387
Cardiac Tissue [Member]
Product Information [Line Items]
Total revenues													29,523		29,756		26,618
Vascular Tissue [Member]
Product Information [Line Items]
Total revenues													34,975		33,847		33,175
Total Preservation Services [Member]
Product Information [Line Items]
Total revenues													64,498		63,603		59,793
Other [Member]
Product Information [Line Items]
Total revenues													$ 71	[1]	$ 619	[1]	$ 446	[1]

[1] For the years ended December 31, 2013, 2012, and 2011 the “Other” designation includes grant revenue.