Consolidated Statement Of Operations And Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues:
Preservation services	$ 63,603	$ 59,793	$ 59,724
Products	67,496	59,387	56,370
Other	619	446	551
Total revenues	131,718	119,626	116,645
Cost of preservation services and products:
Preservation services	35,320	34,340	35,868
Products	11,380	9,442	12,409
Total cost of preservation services and products	46,700	43,782	48,277
Gross margin	85,018	75,844	68,368
Operating expenses:
General, administrative, and marketing	65,149	57,302	49,064
Research and development	7,257	6,899	5,923
Acquired in-process research and development			3,513
Total operating expenses	72,406	64,201	58,500
Operating income	12,612	11,643	9,868
Interest expense	179	142	180
Interest income	(6)	(14)	(23)
Gain on valuation of derivative			(1,345)
Other than temporary investment impairment	340		3,638
Other expense, net	47	49	141
Income before income taxes	12,052	11,466	7,277
Income tax expense	4,106	4,095	3,333
Net income	7,946	7,371	3,944
Income per common share:
Basic	$ 0.29	$ 0.26	$ 0.14
Diluted	$ 0.28	$ 0.26	$ 0.14
Dividends declared per share	$ 0.050
Weighted-average common shares outstanding:
Basic	26,967	27,441	27,987
Diluted	27,411	27,759	28,274
Net income	7,946	7,371	3,944
Other comprehensive (loss) income	(33)	26	6
Comprehensive income	$ 7,913	$ 7,397	$ 3,950