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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Total revenues	$ 76,148	$ 53,771	$ 147,235	$ 120,200
Total cost of products and preservation services	25,635	17,881	48,884	40,139
Total gross margin	50,513	35,890	98,351	80,061
Operating Segments [Member] | Medical Devices [Member]
Segment Reporting Information [Line Items]
Total revenues	56,076	37,268	109,421	83,688
Total cost of products and preservation services	16,178	10,040	31,089	23,080
Total gross margin	39,898	27,228	78,332	60,608
Operating Segments [Member] | Preservation Services [Member]
Segment Reporting Information [Line Items]
Total revenues	20,072	16,503	37,814	36,512
Total cost of products and preservation services	9,457	7,841	17,795	17,059
Total gross margin	$ 10,615	$ 8,662	$ 20,019	$ 19,453