Segment Information (Revenues, Cost Of Products And Services, And Gross Margins For Operating Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Total revenues	$ 72,207	$ 65,131	$ 219,442	$ 185,331
Total cost of products and preservation services	24,418	21,999	73,302	62,138
Total gross margin	47,789	43,132	146,140	123,193
Operating Segments [Member] | Medical Devices [Member]
Segment Reporting Information [Line Items]
Total revenues	53,107	45,109	162,528	128,797
Total cost of products and preservation services	15,503	12,998	46,592	36,078
Total gross margin	37,604	32,111	115,936	92,719
Operating Segments [Member] | Preservation Services [Member]
Segment Reporting Information [Line Items]
Total revenues	19,100	20,022	56,914	56,534
Total cost of products and preservation services	8,915	9,001	26,710	26,060
Total gross margin	$ 10,185	$ 11,021	$ 30,204	$ 30,474