Consolidated Statements Of Operations And Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Total revenues	$ 53,771	$ 71,139	$ 120,200	$ 138,644
Cost of products and preservation services:
Total cost of products and preservation services	17,881	24,173	40,139	47,405
Gross margin	35,890	46,966	80,061	91,239
Operating expenses:
General, administrative, and marketing	32,288	34,623	71,290	71,143
Research and development	5,522	5,841	11,878	11,389
Total operating expenses	37,810	40,464	83,168	82,532
Operating (loss) income	(1,920)	6,502	(3,107)	8,707
Interest expense	3,652	3,811	7,040	7,705
Interest income	(66)	(233)	(168)	(349)
Other (income) expense, net	(740)	185	2,922	262
(Loss) income before income taxes	(4,766)	2,739	(12,901)	1,089
Income tax benefit	(1,077)	(93)	(2,547)	(1,446)
Net (loss) income	$ (3,689)	$ 2,832	$ (10,354)	$ 2,535
(Loss) income per common share:
Basic	$ (0.10)	$ 0.08	$ (0.27)	$ 0.07
Diluted	$ (0.10)	$ 0.07	$ (0.27)	$ 0.07
Weighted-average common shares outstanding:
Basic	37,520	37,156	37,455	36,968
Diluted	37,520	37,838	37,455	37,789
Net (loss) income	$ (3,689)	$ 2,832	$ (10,354)	$ 2,535
Other comprehensive income (loss):
Foreign currency translation adjustments	4,434	2,995	(29)	(786)
Comprehensive (loss) income	745	5,827	(10,383)	1,749
Products [Member]
Revenues:
Total revenues	37,268	51,168	83,688	99,569
Cost of products and preservation services:
Total cost of products and preservation services	10,040	14,489	23,080	28,315
Preservation Services [Member]
Revenues:
Total revenues	16,503	19,971	36,512	39,075
Cost of products and preservation services:
Total cost of products and preservation services	$ 7,841	$ 9,684	$ 17,059	$ 19,090