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Consolidated Statements Of Operations And Comprehensive (Loss) Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues:      
Total revenues $ 276,222 $ 262,841 $ 189,702
Cost of products and preservation services:      
Total cost of products and preservation services 93,209 89,857 61,060
Gross margin 183,013 172,984 128,642
Operating expenses:      
General, administrative, and marketing 143,011 140,574 101,211
Research and development 22,960 23,098 19,461
Total operating expenses 165,971 163,672 120,672
Operating income 17,042 9,312 7,970
Interest expense 14,886 15,788 4,881
Interest income (738) (226) (212)
Other expense (income), net 1,250 141 (260)
Income (loss) before income taxes 1,644 (6,391) 3,561
Income tax (benefit) expense (76) (3,551) (143)
Net income (loss) $ 1,720 $ (2,840) $ 3,704
Income (loss) per common share:      
Basic $ 0.05 $ (0.08) $ 0.11
Diluted [1] $ 0.05 $ (0.08) $ 0.11
Weighted-average common shares outstanding:      
Basic 37,118 36,412 33,008
Diluted 37,860 36,412 34,163
Net income (loss) $ 1,720 $ (2,840) $ 3,704
Other comprehensive (loss) income (2,517) (7,929) 2,286
Comprehensive (loss) income (797) (10,769) 5,990
Products [Member]      
Revenues:      
Total revenues 197,246 187,394 119,631
Cost of products and preservation services:      
Total cost of products and preservation services 55,022 53,772 29,798
Preservation Services [Member]      
Revenues:      
Total revenues 78,976 75,447 70,071
Cost of products and preservation services:      
Total cost of products and preservation services $ 38,187 $ 36,085 $ 31,262
[1] We excluded stock options from the calculation of diluted weighted-average common shares outstanding if the per share value, including the sum of (i) the exercise price of the options and (ii) the amount of the compensation cost attributed to future services and not yet recognized, was greater than the average market price of the shares, because the inclusion of these stock options would be antidilutive to (loss) income per common share. For the year ended December 31, 2018 all stock options and awards were excluded from the calculation of weighted-average common shares outstanding as these would be antidilutive to the net loss. For the years ended December 31, 2019 and 2017 stock options to purchase 131,000 and 227,000 shares, respectively, were excluded from the calculation of diluted weighted-average common shares outstanding.