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Segment and Geographic Information (Tables)
 12 Months Ended
Dec. 31, 2023
Segment Reporting [Abstract]  
Revenues, Cost of Products and Services, and Gross Margins for Operating Segments
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 
Summary of Net Revenues by Product and Service
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 
Schedule of Net Revenues by Geographic Location
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