Segment Information (Revenues, Cost Of Products And Services, And Gross Margins For Operating Segments) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) segment	Jun. 30, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			2
Total revenues	$ 47,818	$ 47,083	$ 92,877	$ 90,099
Total cost of products and preservation services	14,913	16,782	30,460	32,177
Total gross margin	32,905	30,301	62,417	57,922
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenues			0
Operating Segments [Member] | Medical Devices [Member]
Segment Reporting Information [Line Items]
Total revenues	30,094	30,045	57,490	57,063
Total cost of products and preservation services	6,959	7,698	14,976	14,701
Total gross margin	23,135	22,347	42,514	42,362
Operating Segments [Member] | Preservation Services [Member]
Segment Reporting Information [Line Items]
Total revenues	17,724	17,038	35,387	33,036
Total cost of products and preservation services	7,954	9,084	15,484	17,476
Total gross margin	$ 9,770	$ 7,954	$ 19,903	$ 15,560