Segment Information (Summary Of Net Revenues By Product) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013		Jun. 30, 2014	Jun. 30, 2013
Product Information [Line Items]
Total revenues	$ 34,690	$ 33,520		$ 70,421	$ 69,056
BioGlue And BioFoam [Member]
Product Information [Line Items]
Total revenues	15,389	13,542		30,629	29,006
PerClot [Member]
Product Information [Line Items]
Total revenues	1,143	940		2,059	1,804
Revascularization Technologies [Member]
Product Information [Line Items]
Total revenues	2,084	2,293		3,768	4,484
HeRO Graft [Member]
Product Information [Line Items]
Total revenues	1,705	1,420		3,320	2,697
Other Products [Member]
Product Information [Line Items]
Total revenues	29			29
Total Products [Member]
Product Information [Line Items]
Total revenues	20,350	18,195		39,805	37,991
Cardiac Tissue [Member]
Product Information [Line Items]
Total revenues	6,454	6,818		13,644	13,463
Vascular Tissue [Member]
Product Information [Line Items]
Total revenues	7,886	8,499		16,972	17,531
Total Preservation Services [Member]
Product Information [Line Items]
Total revenues	14,340	15,317		30,616	30,994
Other Segments [Member]
Product Information [Line Items]
Total revenues		$ 8	[1]		$ 71	[1]

[1] The “Other” designation includes grant revenue.