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, 2013	Sep. 30, 2012		Sep. 30, 2013 segment		Sep. 30, 2012
Segment Reporting Information [Line Items]
Number of reportable segments				2
Total revenues	$ 36,250	$ 33,429		$ 105,306		$ 98,918
Total cost of preservation services and products	12,901	12,119		37,202		34,945
Total gross margin	23,349	21,310		68,104		63,973
Medical Devices [Member]
Segment Reporting Information [Line Items]
Total revenues	18,833	16,893		56,824		50,043
Total cost of preservation services and products	3,544	3,114		10,730		8,300
Total gross margin	15,289	13,779		46,094		41,743
Preservation Services [Member]
Segment Reporting Information [Line Items]
Total revenues	17,417	16,399		48,411		48,371
Total cost of preservation services and products	9,357	9,005		26,472		26,645
Total gross margin	8,060	7,394		21,939		21,726
Other [Member]
Segment Reporting Information [Line Items]
Total revenues		137	[1]	71	[1]	504	[1]
Total gross margin		$ 137	[1]	$ 71	[1]	$ 504	[1]

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