Segment Information (Revenues, Cost Of Services And Products, And Gross Margins For Operating Segments) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) segment	Jun. 30, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			2
Total revenues	$ 35,526	$ 34,690	$ 69,357	$ 70,421
Total cost of products and preservation services	13,972	12,306	28,136	25,564
Total gross margin	21,554	22,384	41,221	44,857
Medical Devices [Member]
Segment Reporting Information [Line Items]
Total revenues	19,918	20,350	39,309	39,805
Total cost of products and preservation services	4,244	4,131	9,277	7,932
Total gross margin	15,674	16,219	30,032	31,873
Preservation Services [Member]
Segment Reporting Information [Line Items]
Total revenues	15,608	14,340	30,048	30,616
Total cost of products and preservation services	9,728	8,175	18,859	17,632
Total gross margin	$ 5,880	$ 6,165	$ 11,189	$ 12,984