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Segment and Geographic Information
 12 Months Ended
Dec. 31, 2023
Segment Reporting [Abstract]  
Segment and Geographic Information 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 stent grafts, On-X, surgical sealants, and other product revenues. Aortic stent grafts include aortic arch stent grafts, abdominal stent grafts, and synthetic vascular grafts. Aortic arch stent grafts include our E-vita Open NEO, E-vita Open Plus, AMDS, the NEXUS Products, and E-vita Thoracic 3G. Abdominal stent grafts include our E-xtra Design Engineering, E-nside, E-tegra, E-ventus BX, and E-liac products. Surgical sealants include BioGlue Surgical Adhesive products. 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):
 202320222021
Revenues:
Medical devices$261,185 $230,353 $221,597 
Preservation services92,819 83,436 77,239 
Total revenues354,004 313,789 298,836 
Cost of products and preservation services:
Medical devices84,595 72,166 65,196 
Preservation services40,233 39,100 36,126 
Total cost of products and preservation services124,828 111,266 101,322 
Gross margin:
Medical devices176,590 158,187 156,401 
Preservation services52,586 44,336 41,113 
Total gross margin$229,176 $202,523 $197,514 
Net revenues by product for the years ended December 31, 2023, 2022, and 2021 were as follows (in thousands):
202320222021
Products:
Aortic stent grafts$107,469 $92,752 $85,387 
On-X74,528 63,904 57,363 
Surgical sealants68,016 65,379 70,714 
Other11,172 8,318 8,133 
Total products261,185 230,353 221,597 
Preservation services:92,819 83,436 77,239 
Total revenues$354,004 $313,789 $298,836 
Net revenues by geographic location attributed to countries based on the location of the customer for the years ended December 31, 2023, 2022, and 2021 were as follows (in thousands):
202320222021
US$179,485 $161,113 $151,151 
International174,519 152,676 147,685 
Total revenues$354,004 $313,789 $298,836 
Revenues attributed to customers in Germany accounted for 8% of total revenues for the year ended December 31, 2023, 9% for the year ended December 31, 2022, and 10% for the year ended December 31, 2021.
At December 31, 2023 and 2022 $17.5 million and $18.0 million of our long-lived assets were held in the US, respectively, where the corporate headquarters and a portion of our manufacturing facilities are located. Our long-lived international assets were $20.9 million and $20.7 million as of December 31, 2023 and 2022, respectively, of which 97% were located in Hechingen, Germany. At December 31, 2023 and 2022 $247.3 million and $243.6 million, respectively, of our goodwill was allocated entirely to our Medical Devices segment.