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Consolidated Statements Of Operations And Comprehensive (Loss) Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenues:    
Total revenues $ 67,505 $ 61,948
Cost of products and preservation services:    
Total cost of products and preservation services 23,232 22,720
Gross margin 44,273 39,228
Operating expenses:    
General, administrative, and marketing 36,520 37,348
Research and development 5,548 5,370
Total operating expenses 42,068 42,718
Operating income (loss) 2,205 (3,490)
Interest expense 3,894 3,656
Interest income (116) (59)
Other expense (income), net 77 (181)
Loss before income taxes (1,650) (6,906)
Income tax benefit (1,353) (3,051)
Net loss $ (297) $ (3,855)
Loss per common share:    
Basic $ (0.01) $ (0.11)
Diluted $ (0.01) $ (0.11)
Weighted-average common shares outstanding:    
Basic 36,778 36,146
Diluted 36,778 36,146
Net loss $ (297) $ (3,855)
Foreign currency translation adjustments (3,781) 7,139
Comprehensive (loss) income (4,078) 3,284
Products [Member]    
Revenues:    
Total revenues 48,401 43,598
Cost of products and preservation services:    
Total cost of products and preservation services 13,826 14,157
Preservation Services [Member]    
Revenues:    
Total revenues 19,104 18,350
Cost of products and preservation services:    
Total cost of products and preservation services $ 9,406 $ 8,563