Consolidated Statement Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues:
Preservation services	$ 59,793	$ 59,724	$ 56,456
Products	59,387	56,370	54,162
Other	446	551	1,067
Total revenues	119,626	116,645	111,685
Cost of preservation services and products:
Preservation services	34,340	35,868	32,767
Products	9,442	12,409	9,150
Total cost of preservation services and products	43,782	48,277	41,917
Gross margin	75,844	68,368	69,768
Operating expenses:
General, administrative, and marketing	57,302	49,064	50,025
Research and development	6,899	5,923	5,247
Acquired in-process research and development		3,513
Total operating expenses	64,201	58,500	55,272
Operating income	11,643	9,868	14,496
Interest expense	142	180	83
Interest income	(14)	(23)	(76)
Gain on valuation of derivative		(1,345)	(24)
Other than temporary investment impairment		3,638
Other expense, net	49	141	159
Income before income taxes	11,466	7,277	14,354
Income tax expense	4,095	3,333	5,675
Net income	$ 7,371	$ 3,944	$ 8,679
Income per common share:
Basic	$ 0.26	$ 0.14	$ 0.31
Diluted	$ 0.26	$ 0.14	$ 0.30
Weighted-average common shares outstanding:
Basic	27,441	27,987	28,106
Diluted	27,759	28,274	28,310