Segment And Geographic Information	12 Months Ended
	Dec. 31, 2021
Segment And Geographic Information [Abstract]
Segment And Geographic Information	18. Segment and Geographic Information We have two reportable segments organized according to our products and services: Medical devices and Preservation services. The Medical devices segment includes external revenues from product sales of aortic stents and stent grafts, surgical sealants, On-X, and other product revenues. Aortic stents and stent grafts include JOTEC, AMDS, and NEXUS product revenues. Surgical sealants include BioGlue Surgical Adhesive product revenues. The Preservation Services segment includes external services revenues from the preservation of cardiac and vascular tissues. There are no intersegment revenues.  The primary measure of segment performance, as viewed by our management, is segment gross margin, or net external revenues less cost of products and preservation services. We do not segregate assets by segment; therefore, asset information is excluded from the segment disclosures below. The following table summarizes revenues, cost of products and preservation services, and gross margins for our reportable segments (in thousands): 2021 2020 2019Revenues: Medical devices$ 221,597 $ 179,299 $ 197,246Preservation services 77,239 73,928 78,976Total revenues 298,836 253,227 276,222 Cost of products and preservation services: Medical devices 65,196 50,128 55,022Preservation services 36,126 35,315 38,187Total cost of products and preservation services 101,322 85,443 93,209 Gross margin: Medical devices 156,401 129,171 142,224Preservation services 41,113 38,613 40,789Total gross margin$ 197,514 $ 167,784 $ 183,013 Net revenues by product for the years ended December 31, 2021, 2020, and 2019 were as follows (in thousands): 2021 2020 2019Products: Aortic stents and stent grafts$ 85,387 $ 61,663 $ 64,974Surgical sealants 70,714 62,068 68,611On-X 57,363 48,053 50,096Other 8,133 7,515 13,565Total products 221,597 179,299 197,246 Preservation services: 77,239 73,928 78,976Total revenues$ 298,836 $ 253,227 $ 276,222 Net revenues by geographic location attributed to countries based on the location of the customer for the years ended December 31, 2021, 2020, and 2019 were as follows (in thousands): 2021 2020 2019US$ 151,151 $ 138,274 $ 150,553International 147,685 114,953 125,669Total revenues$ 298,836 $ 253,227 $ 276,222 For the years ended December 31, 2021, 2020 and 2019, revenues attributed to customers in Germany accounted for 10% of total revenues. At December 31, 2021 and 2020 45% and 54% of our long-lived assets were held in the US, where the corporate headquarters and a portion of our manufacturing facilities are located. Our long-lived international assets were $20.6 million and $15.1 million as of December 31, 2021 and 2020, respectively, of which 97% were located in Hechingen, Germany. At December 31, 2021 and 2020, $250.0 million and $260.1 million, respectively, of our goodwill was allocated entirely to our Medical Devices segment.