Segment Information (Revenues, Cost Of Products And Services, And Gross Margins For Operating Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total revenues	$ 53,771	$ 71,139	$ 120,200	$ 138,644
Total cost of products and preservation services	17,881	24,173	40,139	47,405
Total gross margin	35,890	46,966	80,061	91,239
Goodwill	186,349		186,349		$ 186,697
Operating Segments [Member] | Medical Devices [Member]
Segment Reporting Information [Line Items]
Total revenues	37,268	51,168	83,688	99,569
Total cost of products and preservation services	10,040	14,489	23,080	28,315
Total gross margin	27,228	36,679	60,608	71,254
Operating Segments [Member] | Preservation Services [Member]
Segment Reporting Information [Line Items]
Total revenues	16,503	19,971	36,512	39,075
Total cost of products and preservation services	7,841	9,684	17,059	19,090
Total gross margin	$ 8,662	$ 10,287	$ 19,453	$ 19,985