Consolidated Statements Of Operations And Comprehensive (Loss) Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Total revenues	$ 68,496	$ 47,818	$ 130,444	$ 92,877
Cost of products and preservation services:
Total cost of products and preservation services	22,645	14,913	45,365	30,460
Gross margin	45,851	32,905	85,079	62,417
Operating expenses:
General, administrative, and marketing	34,727	23,389	72,075	46,260
Research and development	5,719	4,728	11,089	8,821
Total operating expenses	40,446	28,117	83,164	55,081
Operating income	5,405	4,788	1,915	7,336
Interest expense	4,103	834	7,759	1,635
Interest income	(30)	(55)	(89)	(95)
Other expense (income), net	1,466	(134)	1,285	(91)
(Loss) income before income taxes	(134)	4,143	(7,040)	5,887
Income tax (benefit) expense	(360)	980	(3,411)	501
Net income (loss)	$ 226	$ 3,163	$ (3,629)	$ 5,386
Income (loss) per common share:
Basic	$ 0.01	$ 0.09	$ (0.10)	$ 0.16
Diluted	$ 0.01	$ 0.09	$ (0.10)	$ 0.16
Weighted-average common shares outstanding:
Basic	36,318	32,664	36,233	32,552
Diluted	37,249	33,814	36,233	33,739
Net income (loss)	$ 226	$ 3,163	$ (3,629)	$ 5,386
Other comprehensive (loss) income:
Foreign currency translation adjustments	(11,765)	129	(4,626)	365
Comprehensive (loss) income	(11,539)	3,292	(8,255)	5,751
Products [Member]
Revenues:
Total revenues	49,313	30,094	92,911	57,490
Cost of products and preservation services:
Total cost of products and preservation services	13,550	6,959	27,707	14,976
Preservation Services [Member]
Revenues:
Total revenues	19,183	17,724	37,533	35,387
Cost of products and preservation services:
Total cost of products and preservation services	$ 9,095	$ 7,954	$ 17,658	$ 15,484