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, 2014	Sep. 30, 2013	Sep. 30, 2014 segment	Sep. 30, 2013
Segment Reporting Information [Line Items]
Number of reportable segments			2
Total revenues	$ 37,069	$ 36,250	$ 107,490	$ 105,306
Total cost of products and preservation services	13,270	12,901	38,834	37,202
Total gross margin	23,799	23,349	68,656	68,104
Medical Devices [Member]
Segment Reporting Information [Line Items]
Total revenues	20,405	18,833	60,210	56,824
Total cost of products and preservation services	4,167	3,544	12,099	10,730
Total gross margin	16,238	15,289	48,111	46,094
Preservation Services [Member]
Segment Reporting Information [Line Items]
Total revenues	16,664	17,417	47,280	48,411
Total cost of products and preservation services	9,103	9,357	26,735	26,472
Total gross margin	7,561	8,060	20,545	21,939
Other Segments [Member]
Segment Reporting Information [Line Items]
Total revenues				71	[1]
Total gross margin				$ 71	[1]

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