Segment And Geographic Information (Revenues, Cost Of Services And Products, And Gross Margins For Operating Segments) (Details) $ in Thousands		3 Months Ended												12 Months Ended
		Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Sep. 30, 2013 USD ($)	Jun. 30, 2013 USD ($)	Mar. 31, 2013 USD ($)	Dec. 31, 2015 USD ($) segment	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Number of reportable segments | segment														2
Total revenues		$ 39,838	$ 36,703	$ 35,526	$ 33,831	$ 37,151	$ 37,069	$ 34,690	$ 35,731	$ 35,457	$ 36,250	$ 33,520	$ 35,536	$ 145,898	$ 144,641	$ 140,763
Total cost of products and preservation services														55,179	53,350	50,377
Total gross margin		$ 26,516	$ 22,982	$ 21,554	$ 19,667	$ 22,635	$ 23,799	$ 22,384	$ 22,473	$ 22,282	$ 23,349	$ 21,479	$ 23,276	$ 90,719	$ 91,291	90,386
Percent of long-lived assets held in U.S.		95.00%				95.00%								95.00%	95.00%
Goodwill		$ 11,365				$ 11,365								$ 11,365	$ 11,365
Operating Segments [Member] | Medical Devices [Member]
Total revenues														83,081	81,883	76,194
Total cost of products and preservation services														18,663	17,167	15,147
Total gross margin														64,418	64,716	61,047
Operating Segments [Member] | Preservation Services [Member]
Total revenues														62,817	62,758	64,498
Total cost of products and preservation services														36,516	36,183	35,230
Total gross margin														$ 26,301	$ 26,575	29,268
Operating Segments [Member] | Other Segments [Member]
Total revenues	[1]															71
Total gross margin	[1]															$ 71

[1] For the year ended December 31, 2013 the "Other" designation included grant revenue.