Segment Information (Revenues, Cost Of Services And Products, And Gross Margins For Operating Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012 segment		Sep. 30, 2011
Segment Reporting Information [Line Items]
Number of reportable segments					2
Total revenues	$ 33,429		$ 29,654		$ 98,918		$ 89,229
Total cost of preservation services and products	12,119		10,742		34,945		32,760
Total gross margin	21,310		18,912		63,973		56,469
Preservation Services [Member]
Segment Reporting Information [Line Items]
Total revenues	16,399		14,656		48,371		45,018
Total cost of preservation services and products	9,005		8,349		26,645		25,709
Total gross margin	7,394		6,307		21,726		19,309
Medical Devices [Member]
Segment Reporting Information [Line Items]
Total revenues	16,893		14,923		50,043		43,932
Total cost of preservation services and products	3,114		2,393		8,300		7,051
Total gross margin	13,779		12,530		41,743		36,881
Other [Member]
Segment Reporting Information [Line Items]
Total revenues	137	[1]	75	[1]	504	[1]	279	[1]
Total gross margin	$ 137	[1]	$ 75	[1]	$ 504	[1]	$ 279	[1]

[1] For the three and nine months ended September 30, 2012 and 2011, the “Other” designation includes grant revenue.