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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Total revenues	$ 68,496	$ 47,818	$ 130,444	$ 92,877
Total cost of products and preservation services	22,645	14,913	45,365	30,460
Total gross margin	45,851	32,905	85,079	62,417
Operating Segments [Member] | Medical Devices [Member]
Segment Reporting Information [Line Items]
Total revenues	49,313	30,094	92,911	57,490
Total cost of products and preservation services	13,550	6,959	27,707	14,976
Total gross margin	35,763	23,135	65,204	42,514
Operating Segments [Member] | Preservation Services [Member]
Segment Reporting Information [Line Items]
Total revenues	19,183	17,724	37,533	35,387
Total cost of products and preservation services	9,095	7,954	17,658	15,484
Total gross margin	$ 10,088	$ 9,770	$ 19,875	$ 19,903