Consolidated Statements Of Operations And Comprehensive (Loss) Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues:
Total revenues	$ 67,881	$ 64,598	$ 206,525	$ 195,042
Cost of products and preservation services:
Total cost of products and preservation services	22,659	21,884	70,064	67,249
Gross margin	45,222	42,714	136,461	127,793
Operating expenses:
General, administrative, and marketing	34,259	32,871	105,402	104,946
Research and development	6,259	5,225	17,648	16,314
Total operating expenses	40,518	38,096	123,050	121,260
Operating income	4,704	4,618	13,411	6,533
Interest expense	3,555	4,104	11,260	11,863
Interest income	(259)	(52)	(608)	(141)
Other expense (income) net	2,400	(1,542)	2,662	(257)
(Loss) income before income taxes	(992)	2,108	97	(4,932)
Income tax (benefit) expense	(858)	543	(2,304)	(2,868)
Net (loss) income	$ (134)	$ 1,565	$ 2,401	$ (2,064)
(Loss) income per common share:
Basic	$ 0.00	$ 0.04	$ 0.06	$ (0.06)
Diluted	$ 0.00	$ 0.04	$ 0.06	$ (0.06)
Weighted-average common shares outstanding:
Basic	37,255	36,526	37,065	36,331
Diluted	37,255	37,610	37,850	36,331
Net (loss) income	$ (134)	$ 1,565	$ 2,401	$ (2,064)
Other comprehensive (loss) income:
Foreign currency translation adjustments	(8,017)	(514)	(8,803)	(5,140)
Comprehensive (loss) income	(8,151)	1,051	(6,402)	(7,204)
Products [Member]
Revenues:
Total revenues	47,484	45,152	147,053	138,063
Cost of products and preservation services:
Total cost of products and preservation services	12,706	12,459	41,021	40,166
Preservation Services [Member]
Revenues:
Total revenues	20,397	19,446	59,472	56,979
Cost of products and preservation services:
Total cost of products and preservation services	$ 9,953	$ 9,425	$ 29,043	$ 27,083