Consolidated Statements Of Operations And Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
Total revenues	$ 65,131	$ 67,881	$ 185,331	$ 206,525
Cost of products and preservation services:
Total cost of products and preservation services	21,999	22,659	62,138	70,064
Gross margin	43,132	45,222	123,193	136,461
Operating expenses:
General, administrative, and marketing	33,743	34,259	105,033	105,402
Research and development	5,755	6,259	17,633	17,648
Total operating expenses	39,498	40,518	122,666	123,050
Operating income	3,634	4,704	527	13,411
Interest expense	4,940	3,555	11,980	11,260
Interest income	(13)	(259)	(181)	(608)
Other expense, net	2,888	2,400	5,810	2,662
(Loss) income before income taxes	(4,181)	(992)	(17,082)	97
Income tax benefit	(1,311)	(858)	(3,858)	(2,304)
Net (loss) income	$ (2,870)	$ (134)	$ (13,224)	$ 2,401
(Loss) income per common share:
Basic	$ (0.08)	$ 0.00	$ (0.35)	$ 0.06
Diluted	$ (0.08)	$ 0.00	$ (0.35)	$ 0.06
Weighted-average common shares outstanding:
Basic	37,912	37,255	37,608	37,065
Diluted	37,912	37,255	37,608	37,850
Net (loss) income	$ (2,870)	$ (134)	$ (13,224)	$ 2,401
Other comprehensive income (loss):
Foreign currency translation adjustments	8,698	(8,017)	8,669	(8,803)
Comprehensive (loss) income	5,828	(8,151)	(4,555)	(6,402)
Products [Member]
Revenues:
Total revenues	45,109	47,484	128,797	147,053
Cost of products and preservation services:
Total cost of products and preservation services	12,998	12,706	36,078	41,021
Preservation Services [Member]
Revenues:
Total revenues	20,022	20,397	56,534	59,472
Cost of products and preservation services:
Total cost of products and preservation services	$ 9,001	$ 9,953	$ 26,060	$ 29,043